[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"post-es6-12入门到精通教程":3,"sidebar-data":27,"comments-POST-d30eea8b-74b9-4e28-9b7d-5a36024355fa-1":364},{"id":4,"title":5,"slug":6,"content":7,"excerpt":5,"coverImage":8,"status":9,"isPinned":10,"pinnedAt":11,"viewCount":12,"publishedAt":13,"createdAt":13,"updatedAt":14,"category":15,"author":19,"tags":22},"d30eea8b-74b9-4e28-9b7d-5a36024355fa","ES6-12入门到精通教程","es6-12入门到精通教程","## let 与 const\n\n### 代码块内有效\n>let 是在代码块内有效，var 是在全局范围内有效:\n```js\n{\n  let a = 0;\n  a   \u002F\u002F 0\n}\na   \u002F\u002F 报错 ReferenceError: a is not defined\n```\n\n### 不能重复声明\n> let 只能声明一次 var 可以声明多次:\n```js\nlet a = 1;\nlet a = 2;\nvar b = 3;\nvar b = 4;\na  \u002F\u002F Identifier 'a' has already been declared\nb  \u002F\u002F 4\n```\n\n#### for 循环计数器很适合用 let\n> 变量 i 是用 var 声明的，在全局范围内有效，所以全局中只有一个变量 i, 每次循环时，setTimeout 定时器里面的 i 指的是全局变量 i ，而循环里的十个 setTimeout 是在循环结束后才执行，所以此时的 i 都是 10。\n变量 j 是用 let 声明的，当前的 j 只在本轮循环中有效，每次循环的 j 其实都是一个新的变量，所以 setTimeout 定时器里面的 j 其实是不同的变量，即最后输出 12345。（若每次循环的变量 j 都是重新声明的，如何知道前一个循环的值？这是因为 JavaScript 引擎内部会记住前一个循环的值）。\n```js\nfor (var i = 0; i \u003C 10; i++) {\n  setTimeout(function(){\n    console.log(i);\n  })\n}\n\u002F\u002F 输出十个 10\nfor (let j = 0; j \u003C 10; j++) {\n  setTimeout(function(){\n    console.log(j);\n  })\n}\n\u002F\u002F 输出 0123456789\n```\n\n### 不存在变量提升\n> let 不存在变量提升，var 会变量提升:\n变量 b 用 var 声明存在变量提升，所以当脚本开始运行的时候，b 已经存在了，但是还没有赋值，所以会输出 undefined。\n变量 a 用 let 声明不存在变量提升，在声明变量 a 之前，a 不存在，所以会报错。\n```js\nconsole.log(a);  \u002F\u002FReferenceError: a is not defined\nlet a = \\\"apple\\\";\n \nconsole.log(b);  \u002F\u002Fundefined\nvar b = \\\"banana\\\";\n```\n\n\n## const 声明一个只读的常量，一旦声明，常量的值就不能改变。\n> const 声明一个只读变量，声明之后不允许改变。意味着，一旦声明必须初始化，否则会报错。\n```language\nconst PI = \\\"3.1415926\\\";\nPI  \u002F\u002F 3.1415926\n\nconst MY_AGE;  \u002F\u002F SyntaxError: Missing initializer in const declaration    \n\n```\n\n### 暂时性死区:\n>ES6 明确规定，代码块内如果存在 let 或者 const，代码块会对这些命令声明的变量从块的开始就形成一个封闭作用域。代码块内，在声明变量 PI 之前使用它会报错。\n```js\nvar PI = \\\"a\\\";\nif(true){\n  console.log(PI);  \u002F\u002F ReferenceError: PI is not defined\n  const PI = \\\"3.1415926\\\";\n}\n```\n\n#### 注意要点\n>const 如何做到变量在声明初始化之后不允许改变的？其实 const 其实保证的不是变量的值不变，而是保证变量指向的内存地址所保存的数据不允许改动。此时，你可能已经想到，简单类型和复合类型保存值的方式是不同的。是的，对于简单类型（数值 number、字符串 string 、布尔值 boolean）,值就保存在变量指向的那个内存地址，因此 const 声明的简单类型变量等同于常量。而复杂类型（对象 object，数组 array，函数 function），变量指向的内存地址其实是保存了一个指向实际数据的指针，所以 const 只能保证指针是固定的，至于指针指向的数据结构变不变就无法控制了，所以使用 const 声明复杂类型对象时要慎重。\n\n## 解构赋值\n> 解构的源，解构赋值表达式的右边部分。\n解构的目标，解构赋值表达式的左边部分\n\n### 数组模型的解构（Array）\n#### 基本\n```js\nlet [a, b, c] = [1, 2, 3];\n\u002F\u002F a = 1\n\u002F\u002F b = 2\n\u002F\u002F c = 3\n```\n#### 可嵌套\n```js\nlet [a, [[b], c]] = [1, [[2], 3]];\n\u002F\u002F a = 1\n\u002F\u002F b = 2\n\u002F\u002F c = 3\n```\n\n#### 可忽略\n```js\nlet [a, , b] = [1, 2, 3];\n\u002F\u002F a = 1\n\u002F\u002F b = 3\n```\n\n#### 不完全解构\n```js\nlet [a = 1, b] = []; \u002F\u002F a = 1, b = undefined\n```\n\n#### 剩余运算符\n```js\nlet [a, ...b] = [1, 2, 3];\n\u002F\u002Fa = 1\n\u002F\u002Fb = [2, 3]\n```\n\n#### 字符串等\n> 在数组的解构中，解构的目标若为可遍历对象，皆可进行解构赋值。可遍历对象即实现 Iterator 接口的数据。\n```js\nlet [a, b, c, d, e] = 'hello';\n\u002F\u002F a = 'h'\n\u002F\u002F b = 'e'\n\u002F\u002F c = 'l'\n\u002F\u002F d = 'l'\n\u002F\u002F e = 'o'\n```\n\n#### 解构默认值\n\n```js\nlet [a = 2] = [undefined]; \u002F\u002F a = 2\n```\n> 当解构模式有匹配结果，且匹配结果是 undefined 时，会触发默认值作为返回结果。\n```js\nlet [a = 3, b = a] = [];     \u002F\u002F a = 3, b = 3\nlet [a = 3, b = a] = [1];    \u002F\u002F a = 1, b = 1\nlet [a = 3, b = a] = [1, 2]; \u002F\u002F a = 1, b = 2\n```\n- a 与 b 匹配结果为 undefined ，触发默认值：a = 3; b = a =3\n- a 正常解构赋值，匹配结果：a = 1，b 匹配结果 undefined ，触发默认值：b = a =1\n- a 与 b 正常解构赋值，匹配结果：a = 1，b = 2\n\n### 对象模型的解构（Object）\n#### 基本\n```js\nlet { foo, bar } = { foo: 'aaa', bar: 'bbb' };\n\u002F\u002F foo = 'aaa'\n\u002F\u002F bar = 'bbb'\n \nlet { baz : foo } = { baz : 'ddd' };\n\u002F\u002F foo = 'ddd'\n```\n\n#### 可嵌套可忽略\n```js\nlet obj = {p: ['hello', {y: 'world'}] };\nlet {p: [x, { y }] } = obj;\n\u002F\u002F x = 'hello'\n\u002F\u002F y = 'world'\nlet obj = {p: ['hello', {y: 'world'}] };\nlet {p: [x, {  }] } = obj;\n\u002F\u002F x = 'hello'\n```\n\n#### 不完全解构\n\n```js\nlet obj = {p: [{y: 'world'}] };\nlet {p: [{ y }, x ] } = obj;\n\u002F\u002F x = undefined\n\u002F\u002F y = 'world'\n```\n\n#### 剩余运算符\n\n```js\nlet {a, b, ...rest} = {a: 10, b: 20, c: 30, d: 40};\n\u002F\u002F a = 10\n\u002F\u002F b = 20\n\u002F\u002F rest = {c: 30, d: 40}\n```\n\n#### 解构默认值\n```js\nlet {a = 10, b = 5} = {a: 3};\n\u002F\u002F a = 3; b = 5;\nlet {a: aa = 10, b: bb = 5} = {a: 3};\n\u002F\u002F aa = 3; bb = 5;\n```\n\n## 字符串\n- includes()：返回布尔值，判断是否找到参数字符串。\n- startsWith()：返回布尔值，判断参数字符串是否在原字符串的头部。\n- endsWith()：返回布尔值，判断参数字符串是否在原字符串的尾部。\n\n> 以上三个方法都可以接受两个参数，需要搜索的字符串，和可选的搜索起始位置索引。\n```js\nlet string = \\\"apple,banana,orange\\\";\nstring.includes(\\\"banana\\\");     \u002F\u002F true\nstring.startsWith(\\\"apple\\\");    \u002F\u002F true\nstring.endsWith(\\\"apple\\\");      \u002F\u002F false\nstring.startsWith(\\\"banana\\\",6)  \u002F\u002F true\n```\n> 注意点：这三个方法只返回布尔值，如果需要知道子串的位置，还是得用 indexOf 和 lastIndexOf 。\n这三个方法如果传入了正则表达式而不是字符串，会抛出错误。而 indexOf 和 lastIndexOf 这两个方法，它们会将正则表达式转换为字符串并搜索它。\n\n#### 字符串重复\n##### repeat()：返回新的字符串，表示将字符串重复指定次数返回。\n```js\nconsole.log(\\\"Hello,\\\".repeat(2));  \u002F\u002F \\\"Hello,Hello,\\\"\n```\n##### 如果参数是小数，向下取整\n\n```js\nconsole.log(\\\"Hello,\\\".repeat(3.2));  \u002F\u002F \\\"Hello,Hello,Hello,\\\"\n```\n\n##### 如果参数是 0 至 -1 之间的小数，会进行取整运算，0 至 -1 之间的小数取整得到 -0 ，等同于 repeat 零次\n```js\nconsole.log(\\\"Hello,\\\".repeat(-0.5));  \u002F\u002F \\\"\\\" \n```\n\n##### 如果参数是 NaN，等同于 repeat 零次\n```js\nconsole.log(\\\"Hello,\\\".repeat(NaN));  \u002F\u002F \\\"\\\" \n```\n\n##### 如果参数是负数或者 Infinity ，会报错:\n```js\nconsole.log(\\\"Hello,\\\".repeat(-1));  \n\u002F\u002F RangeError: Invalid count value\n\nconsole.log(\\\"Hello,\\\".repeat(Infinity));  \n\u002F\u002F RangeError: Invalid count value\n```\n\n##### 如果传入的参数是字符串，则会先将字符串转化为数字\n```js\nconsole.log(\\\"Hello,\\\".repeat(\\\"hh\\\")); \u002F\u002F \\\"\\\"\nconsole.log(\\\"Hello,\\\".repeat(\\\"2\\\"));  \u002F\u002F \\\"Hello,Hello,\\\"\n```\n\n##### 字符串补全\n- padStart：返回新的字符串，表示用参数字符串从头部（左侧）补全原字符串。\n- padEnd：返回新的字符串，表示用参数字符串从尾部（右侧）补全原字符串。\n> 以上两个方法接受两个参数，第一个参数是指定生成的字符串的最小长度，第二个参数是用来补全的字符串。如果没有指定第二个参数，默认用空格填充。\n\n```js\nconsole.log(\\\"h\\\".padStart(5,\\\"o\\\"));  \u002F\u002F \\\"ooooh\\\"\nconsole.log(\\\"h\\\".padEnd(5,\\\"o\\\"));    \u002F\u002F \\\"hoooo\\\"\nconsole.log(\\\"h\\\".padStart(5));      \u002F\u002F \\\"    h\\\"\n```\n\n\n\n\n# ES6+ 中常用的数组方法\n\n## 1. forEach()\n遍历数组，对每个元素执行回调函数\n```javascript\nconst numbers = [1, 2, 3, 4];\nnumbers.forEach((item, index, array) => {\n    console.log(`索引 ${index}: ${item}`);\n});\n\u002F\u002F 输出:\n\u002F\u002F 索引 0: 1\n\u002F\u002F 索引 1: 2\n\u002F\u002F 索引 2: 3\n\u002F\u002F 索引 3: 4\n```\n\n## 2. map()\n创建新数组，包含原数组每个元素调用函数后的结果\n```javascript\nconst numbers = [1, 2, 3];\nconst doubled = numbers.map(num => num * 2);\nconsole.log(doubled); \u002F\u002F [2, 4, 6]\n\nconst users = [\n    { name: 'Alice', age: 25 },\n    { name: 'Bob', age: 30 }\n];\nconst names = users.map(user => user.name);\nconsole.log(names); \u002F\u002F ['Alice', 'Bob']\n```\n\n## 3. filter()\n创建新数组，包含所有通过测试的元素\n```javascript\nconst numbers = [1, 2, 3, 4, 5, 6];\nconst even = numbers.filter(num => num % 2 === 0);\nconsole.log(even); \u002F\u002F [2, 4, 6]\n\nconst products = [\n    { name: '手机', inStock: true },\n    { name: '电脑', inStock: false },\n    { name: '平板', inStock: true }\n];\nconst availableProducts = products.filter(product => product.inStock);\nconsole.log(availableProducts); \u002F\u002F [{name: '手机', inStock: true}, {name: '平板', inStock: true}]\n```\n\n## 4. find() & findIndex()\n查找第一个满足条件的元素\u002F索引\n```javascript\nconst users = [\n    { id: 1, name: 'Alice' },\n    { id: 2, name: 'Bob' },\n    { id: 3, name: 'Charlie' }\n];\n\nconst user = users.find(user => user.id === 2);\nconsole.log(user); \u002F\u002F {id: 2, name: 'Bob'}\n\nconst index = users.findIndex(user => user.name === 'Charlie');\nconsole.log(index); \u002F\u002F 2\n```\n\n## 5. some() & every()\n检查数组中是否至少有一个\u002F所有元素满足条件\n```javascript\nconst numbers = [1, 2, 3, 4, 5];\n\nconst hasEven = numbers.some(num => num % 2 === 0);\nconsole.log(hasEven); \u002F\u002F true\n\nconst allPositive = numbers.every(num => num > 0);\nconsole.log(allPositive); \u002F\u002F true\n```\n\n## 6. reduce() & reduceRight()\n将数组缩减为单个值（从左到右\u002F从右到左）\n```javascript\nconst numbers = [1, 2, 3, 4, 5];\n\n\u002F\u002F 求和\nconst sum = numbers.reduce((accumulator, current) => accumulator + current, 0);\nconsole.log(sum); \u002F\u002F 15\n\n\u002F\u002F 分组\nconst people = [\n    { name: 'Alice', age: 25 },\n    { name: 'Bob', age: 30 },\n    { name: 'Charlie', age: 25 }\n];\n\nconst groupedByAge = people.reduce((groups, person) => {\n    const age = person.age;\n    if (!groups[age]) {\n        groups[age] = [];\n    }\n    groups[age].push(person);\n    return groups;\n}, {});\n\nconsole.log(groupedByAge);\n\u002F\u002F {25: [{name: 'Alice', age: 25}, {name: 'Charlie', age: 25}], 30: [{name: 'Bob', age: 30}]}\n```\n\n## 7. flat() & flatMap()\n扁平化数组\n```javascript\n\u002F\u002F flat()\nconst nested = [1, 2, [3, 4, [5, 6]]];\nconsole.log(nested.flat()); \u002F\u002F [1, 2, 3, 4, [5, 6]]\nconsole.log(nested.flat(2)); \u002F\u002F [1, 2, 3, 4, 5, 6]\n\n\u002F\u002F flatMap()\nconst sentences = [\\\"Hello world\\\", \\\"Good morning\\\"];\nconst words = sentences.flatMap(sentence => sentence.split(' '));\nconsole.log(words); \u002F\u002F [\\\"Hello\\\", \\\"world\\\", \\\"Good\\\", \\\"morning\\\"]\n```\n\n## 8. includes()\n检查数组是否包含某个元素\n```javascript\nconst fruits = ['apple', 'banana', 'orange'];\nconsole.log(fruits.includes('banana')); \u002F\u002F true\nconsole.log(fruits.includes('grape')); \u002F\u002F false\n```\n\n## 9. Array.from()\n从类数组或可迭代对象创建新数组\n```javascript\n\u002F\u002F 从字符串\nconst fromString = Array.from('hello');\nconsole.log(fromString); \u002F\u002F ['h', 'e', 'l', 'l', 'o']\n\n\u002F\u002F 从Set\nconst fromSet = Array.from(new Set([1, 2, 2, 3, 3]));\nconsole.log(fromSet); \u002F\u002F [1, 2, 3]\n\n\u002F\u002F 带映射函数\nconst squares = Array.from([1, 2, 3], x => x * x);\nconsole.log(squares); \u002F\u002F [1, 4, 9]\n```\n\n## 10. Array.of()\n根据参数创建新数组\n```javascript\nconst numbers = Array.of(1, 2, 3, 4);\nconsole.log(numbers); \u002F\u002F [1, 2, 3, 4]\n\n\u002F\u002F 与 Array 构造函数的区别\nconsole.log(Array(3)); \u002F\u002F [empty × 3]\nconsole.log(Array.of(3)); \u002F\u002F [3]\n```\n\n## 11. fill()\n用固定值填充数组\n```javascript\nconst arr = new Array(5).fill(0);\nconsole.log(arr); \u002F\u002F [0, 0, 0, 0, 0]\n\nconst numbers = [1, 2, 3, 4, 5];\nnumbers.fill('*', 1, 3);\nconsole.log(numbers); \u002F\u002F [1, '*', '*', 4, 5]\n```\n\n## 12. copyWithin()\n在数组内部复制元素序列\n```javascript\nconst numbers = [1, 2, 3, 4, 5];\nnumbers.copyWithin(0, 3);\nconsole.log(numbers); \u002F\u002F [4, 5, 3, 4, 5]\n```\n\n## 13. entries(), keys(), values()\n返回数组的迭代器对象\n```javascript\nconst fruits = ['apple', 'banana', 'orange'];\n\n\u002F\u002F entries() - 键值对\nfor (const [index, fruit] of fruits.entries()) {\n    console.log(index, fruit);\n}\n\n\u002F\u002F keys() - 键\nfor (const key of fruits.keys()) {\n    console.log(key); \u002F\u002F 0, 1, 2\n}\n\n\u002F\u002F values() - 值\nfor (const value of fruits.values()) {\n    console.log(value); \u002F\u002F 'apple', 'banana', 'orange'\n}\n```\n\n## 实际应用示例\n\n```javascript\n\u002F\u002F 数据处理管道\nconst data = [\n    { name: 'Alice', age: 25, salary: 50000, department: 'IT' },\n    { name: 'Bob', age: 30, salary: 60000, department: 'HR' },\n    { name: 'Charlie', age: 35, salary: 70000, department: 'IT' },\n    { name: 'David', age: 28, salary: 55000, department: 'Finance' }\n];\n\n\u002F\u002F 计算IT部门员工的平均薪资\nconst itAvgSalary = data\n    .filter(employee => employee.department === 'IT')\n    .map(employee => employee.salary)\n    .reduce((sum, salary, index, array) => {\n        sum += salary;\n        if (index === array.length - 1) {\n            return sum \u002F array.length;\n        }\n        return sum;\n    }, 0);\n\nconsole.log(`IT部门平均薪资: ${itAvgSalary}`); \u002F\u002F IT部门平均薪资: 60000\n```\n\n\n在 ES6 中，有以下数组方法会**直接影响原数组**：\n\n## 会改变原数组的 ES6 方法：\n\n### 1. `copyWithin()`\n```javascript\nconst arr = [1, 2, 3, 4, 5];\narr.copyWithin(0, 3); \u002F\u002F 将索引3开始的元素复制到索引0\nconsole.log(arr); \u002F\u002F [4, 5, 3, 4, 5]\n```\n\n### 2. `fill()`\n```javascript\nconst arr = [1, 2, 3, 4, 5];\narr.fill(0, 1, 3); \u002F\u002F 将索引1-3的元素填充为0\nconsole.log(arr); \u002F\u002F [1, 0, 0, 4, 5]\n```\n\n## 传统方法（ES5及之前，但ES6中仍然存在）：\n\n### 3. `push()` \u002F `pop()`\n```javascript\nconst arr = [1, 2, 3];\narr.push(4); \u002F\u002F [1, 2, 3, 4]\narr.pop();   \u002F\u002F [1, 2, 3]\n```\n\n### 4. `shift()` \u002F `unshift()`\n```javascript\nconst arr = [1, 2, 3];\narr.shift();   \u002F\u002F [2, 3]\narr.unshift(0); \u002F\u002F [0, 2, 3]\n```\n\n### 5. `splice()`\n```javascript\nconst arr = [1, 2, 3, 4, 5];\narr.splice(1, 2, 'a', 'b'); \u002F\u002F 从索引1删除2个元素，并插入新元素\nconsole.log(arr); \u002F\u002F [1, 'a', 'b', 4, 5]\n```\n\n### 6. `reverse()`\n```javascript\nconst arr = [1, 2, 3];\narr.reverse(); \u002F\u002F [3, 2, 1]\n```\n\n### 7. `sort()`\n```javascript\nconst arr = [3, 1, 2];\narr.sort(); \u002F\u002F [1, 2, 3]\n```\n\n## 不会改变原数组的方法：\n\n以下方法会返回新数组，**不会改变原数组**：\n- `map()`\n- `filter()`\n- `slice()`\n- `concat()`\n- `flat()`\n- `flatMap()`\n\n```javascript\nconst arr = [1, 2, 3];\nconst newArr = arr.map(x => x * 2);\nconsole.log(arr);    \u002F\u002F [1, 2, 3] - 原数组不变\nconsole.log(newArr); \u002F\u002F [2, 4, 6] - 新数组\n```\n\n**总结**：在 ES6 新增方法中，只有 `copyWithin()` 和 `fill()` 会直接修改原数组。\n\n\n\n","https:\u002F\u002Fcdn.xiaolong0418.com\u002Fmyblog\u002Fimages\u002F12309d08199ce1440dd05cff7694a487.png","PUBLISHED",false,null,747,"2022-08-22T14:27:11.000Z","2026-06-28T18:45:16.618Z",{"id":16,"name":17,"slug":18},"da130ba9-d4f4-49f3-aa0f-149078097ef0","JavaScript","javascript",{"id":20,"name":21,"avatar":11},"f9d0f2de-c700-4f90-b535-afd3dbe78128","Admin",[23],{"id":24,"name":25,"slug":26},"994cc226-578b-4a72-a57e-a47a63d2793e","JavaScript生态","javascript生态",{"categories":28,"tags":114,"postCount":295,"tagCount":296,"hotPosts":297},[29,37,44,51,57,64,68,72,79,83,87,93,99,104,108],{"id":30,"name":31,"slug":32,"description":33,"sortOrder":34,"createdAt":35,"updatedAt":35,"postCount":36},"e8d0bd45-d10c-46d3-8afb-0c072df7f8a7","技术","tech","技术文章",0,"2026-06-27T04:18:37.371Z",1,{"id":38,"name":39,"slug":40,"description":39,"sortOrder":36,"createdAt":41,"updatedAt":42,"postCount":43},"15ac46ad-edf7-4435-9a64-ff78117d58c5","Vue3 生态","vue3-生态","2022-05-21T08:05:39.000Z","2023-02-08T02:49:14.000Z",6,{"id":45,"name":46,"slug":47,"description":46,"sortOrder":48,"createdAt":49,"updatedAt":42,"postCount":50},"11d4d397-685c-4180-a7b3-9b0e3a1e411e","Css","css",2,"2022-05-23T07:19:37.000Z",9,{"id":52,"name":53,"slug":53,"description":53,"sortOrder":54,"createdAt":55,"updatedAt":42,"postCount":56},"d10456a5-e649-4741-a38f-f07f266ce5f2","开发环境",3,"2022-05-24T01:52:41.000Z",13,{"id":58,"name":59,"slug":60,"description":59,"sortOrder":61,"createdAt":62,"updatedAt":42,"postCount":63},"5ed5cc62-43ea-49a2-b0b2-38bc7aae52a0","Vue3","vue3",4,"2022-05-24T01:55:05.000Z",8,{"id":16,"name":17,"slug":18,"description":17,"sortOrder":65,"createdAt":66,"updatedAt":42,"postCount":67},5,"2022-05-24T02:22:57.000Z",18,{"id":69,"name":70,"slug":70,"description":70,"sortOrder":43,"createdAt":71,"updatedAt":42,"postCount":36},"d8cbe380-54b3-4a61-a12d-5438c2918574","限时优惠","2022-05-25T07:18:03.000Z",{"id":73,"name":74,"slug":75,"description":74,"sortOrder":76,"createdAt":77,"updatedAt":42,"postCount":78},"e0f3b8d8-cfe7-41fb-802b-a79699d95968","JavaScript插件","javascript插件",7,"2022-06-01T14:08:31.000Z",16,{"id":80,"name":81,"slug":81,"description":81,"sortOrder":63,"createdAt":82,"updatedAt":42,"postCount":43},"4ea3d8af-9cc3-49bb-a9cd-34dbcdc3bd85","构建工具","2022-06-02T07:28:13.000Z",{"id":84,"name":85,"slug":85,"description":85,"sortOrder":50,"createdAt":86,"updatedAt":42,"postCount":63},"9ed9827c-9cbb-42da-80e4-d04c7fdba886","开发工具","2022-06-21T03:35:05.000Z",{"id":88,"name":89,"slug":90,"description":89,"sortOrder":91,"createdAt":92,"updatedAt":42,"postCount":65},"6b9179c3-17b2-43ff-a431-a03d6eb32d89","Vue2 生态","vue2-生态",10,"2022-07-16T13:14:29.000Z",{"id":94,"name":95,"slug":96,"description":95,"sortOrder":97,"createdAt":98,"updatedAt":42,"postCount":65},"73a5f62c-3c47-45b9-9ae2-f29953ae8dc0","Node","node",11,"2022-07-16T13:15:39.000Z",{"id":100,"name":101,"slug":101,"description":101,"sortOrder":102,"createdAt":103,"updatedAt":42,"postCount":48},"2b696c16-48ef-403b-a88b-6e57cfc79596","开发问题",12,"2022-07-16T14:06:54.000Z",{"id":105,"name":106,"slug":106,"description":106,"sortOrder":56,"createdAt":107,"updatedAt":42,"postCount":36},"c0f0561e-a47a-4ecd-8caa-cc1df2315d57","算法","2022-07-16T14:22:34.000Z",{"id":109,"name":110,"slug":111,"description":110,"sortOrder":112,"createdAt":113,"updatedAt":42,"postCount":54},"a629c1f7-29f1-439e-be3c-29670b17ba20","Vue2","vue2",15,"2022-07-16T14:41:51.000Z",[115,121,126,129,134,139,140,144,149,154,159,164,167,172,176,180,185,190,195,200,204,208,212,214,218,223,228,231,234,237,240,243,247,250,252,254,257,261,264,268,272,275,278,280,283,285,289,292],{"id":116,"name":117,"slug":118,"createdAt":119,"updatedAt":120},"076bd8b9-293e-45cb-9dc3-e162007ca474","Axios","axios","2022-06-05T07:41:56.000Z","2025-12-30T07:26:21.000Z",{"id":122,"name":123,"slug":124,"createdAt":125,"updatedAt":42},"2aa7f6d0-1fac-4ed1-b9bb-f3afc813f42c","Axure","axure","2022-06-21T03:35:15.000Z",{"id":127,"name":46,"slug":47,"createdAt":128,"updatedAt":42},"b084ddd8-09be-4e57-98f0-cf4e376aecd7","2022-05-21T09:59:55.000Z",{"id":130,"name":131,"slug":132,"createdAt":133,"updatedAt":42},"78a62bff-ff77-4878-8c25-3e6aae18c668","Docker","docker","2022-07-16T14:34:37.000Z",{"id":135,"name":136,"slug":137,"createdAt":138,"updatedAt":42},"2de16806-ef3f-4e54-a259-d1e1e182468c","Git","git","2022-07-16T14:25:15.000Z",{"id":24,"name":25,"slug":26,"createdAt":128,"updatedAt":42},{"id":141,"name":142,"slug":143,"createdAt":128,"updatedAt":42},"5086e93c-23b9-43d3-9643-cc87f0e9ee94","JenKins","jenkins",{"id":145,"name":146,"slug":147,"createdAt":148,"updatedAt":42},"b73007a8-bb5c-42a8-9fd9-163033a5b45d","Linux","linux","2022-07-16T14:40:17.000Z",{"id":150,"name":151,"slug":152,"createdAt":153,"updatedAt":42},"0b658b92-dd6b-4db3-a398-9f6d69950a02","Markdown","markdown","2022-07-16T14:39:25.000Z",{"id":155,"name":156,"slug":157,"createdAt":158,"updatedAt":42},"ab034d3a-6e5b-4db5-a2dc-faf4ccbb63f5","Nest","nest","2022-07-16T13:15:49.000Z",{"id":160,"name":161,"slug":162,"createdAt":163,"updatedAt":42},"52c41978-da06-4962-9636-45bbaeedda80","Nginx","nginx","2022-05-21T09:59:56.000Z",{"id":165,"name":166,"slug":166,"createdAt":163,"updatedAt":42},"0f1cc678-40e4-44b1-b2cf-a6fd8a1c867a","npm",{"id":168,"name":169,"slug":170,"createdAt":171,"updatedAt":42},"a4370d78-70e1-4073-a8f6-3dc5d81fd8fd","Nuxt","nuxt","2022-06-01T13:07:07.000Z",{"id":173,"name":174,"slug":175,"createdAt":128,"updatedAt":42},"d232e01f-048e-4151-8a0a-fff9561f946f","Pinia","pinia",{"id":177,"name":178,"slug":179,"createdAt":163,"updatedAt":42},"14e9ab02-b0bb-4c85-8604-fe6f1f0f33cd","Pnpm","pnpm",{"id":181,"name":182,"slug":183,"createdAt":184,"updatedAt":184},"399d1d38-cc0d-43ce-8baf-c769447a2ebd","React生态","react生态","2023-02-21T02:03:09.000Z",{"id":186,"name":187,"slug":188,"createdAt":189,"updatedAt":42},"c95bbe84-bdd0-410a-86a9-e87958c55f4f","Redis","redis","2022-10-05T05:14:14.000Z",{"id":191,"name":192,"slug":193,"createdAt":194,"updatedAt":42},"6d05f9df-e116-450f-af57-85ed710c4870","Swiper","swiper","2022-06-01T14:08:46.000Z",{"id":196,"name":197,"slug":198,"createdAt":199,"updatedAt":42},"66f3aeb0-84ef-45f6-a43a-944eefc9895a","Vite","vite","2022-06-02T07:28:24.000Z",{"id":201,"name":202,"slug":203,"createdAt":128,"updatedAt":42},"bf5b94d3-090b-4098-a03c-4bc69781fb2d","Vue","vue",{"id":205,"name":206,"slug":207,"createdAt":163,"updatedAt":42},"2f7fb1be-b9c5-4606-b54f-e9f66f2653b2","Vue-Router","vue-router",{"id":209,"name":210,"slug":211,"createdAt":128,"updatedAt":42},"2fef3b91-1c1c-4ae8-b2c1-0e04b4f9b3a2","Vue2生态","vue2生态",{"id":213,"name":59,"slug":60,"createdAt":128,"updatedAt":42},"62b94c93-724f-488d-8fc5-0449971d9204",{"id":215,"name":216,"slug":217,"createdAt":128,"updatedAt":42},"20bff9cd-7848-4c16-8775-42cf12b44b30","Vue3生态","vue3生态",{"id":219,"name":220,"slug":221,"createdAt":222,"updatedAt":42},"c807b2c6-cb12-4409-a1f1-6bea9f330a6b","Vuex","vuex","2022-07-16T13:14:59.000Z",{"id":224,"name":225,"slug":226,"createdAt":227,"updatedAt":42},"5782dff5-2ea2-4427-9696-d4363a7fd5bc","Webpack","webpack","2022-07-16T14:33:41.000Z",{"id":229,"name":230,"slug":230,"createdAt":128,"updatedAt":42},"d0aa41f4-68f8-48d4-a4ed-3a503ea90451","下载",{"id":232,"name":233,"slug":233,"createdAt":128,"updatedAt":42},"a046060c-39ef-474a-8c85-2546aca0e2e5","代码片段",{"id":235,"name":236,"slug":236,"createdAt":128,"updatedAt":42},"fee73435-b2be-4b55-85b1-d133ea96aea4","伪元素",{"id":238,"name":239,"slug":239,"createdAt":128,"updatedAt":42},"436bd369-8c57-4869-8827-e88e50e5e0ab","伪类",{"id":241,"name":242,"slug":242,"createdAt":128,"updatedAt":42},"4c6be544-8a00-4445-92a3-e3dcbaf6142e","动画",{"id":244,"name":245,"slug":245,"createdAt":246,"updatedAt":42},"9321a12e-ea72-49a9-a32d-5566149f812f","图片压缩","2022-08-02T00:37:47.000Z",{"id":248,"name":249,"slug":249,"createdAt":163,"updatedAt":42},"512b16fb-576a-4397-a7c5-dd20e6a8f9ca","布局",{"id":251,"name":85,"slug":85,"createdAt":128,"updatedAt":42},"f32faa96-f2ec-45c6-9a17-2c76062edcb0",{"id":253,"name":53,"slug":53,"createdAt":128,"updatedAt":42},"3c46ed3f-6d6b-4f91-bcb3-af5112860bf5",{"id":255,"name":256,"slug":256,"createdAt":128,"updatedAt":42},"dbfc086a-73a6-4560-814d-593acb61cf98","性能优化",{"id":258,"name":259,"slug":259,"createdAt":260,"updatedAt":42},"1831cd06-0d6b-48f7-94fa-324782fe23cb","拖拽","2022-07-28T12:39:13.000Z",{"id":262,"name":263,"slug":263,"createdAt":163,"updatedAt":42},"9a74300d-06f7-46d0-80d9-8fe67ec0539b","数组",{"id":265,"name":266,"slug":266,"createdAt":267,"updatedAt":42},"19ac8998-7e0a-459b-9702-bb1adca70e8c","文本复制","2022-07-17T01:54:45.000Z",{"id":269,"name":270,"slug":270,"createdAt":271,"updatedAt":42},"5ff33473-71a4-4e02-8c82-f9ea369a768f","时间","2022-07-17T01:51:12.000Z",{"id":273,"name":274,"slug":274,"createdAt":128,"updatedAt":42},"aa47ca4d-d3f6-4cac-b495-2c67c9592c36","最新优惠",{"id":276,"name":277,"slug":277,"createdAt":163,"updatedAt":42},"f6766d54-54fc-405e-932d-b7d550559125","服务器",{"id":279,"name":81,"slug":81,"createdAt":128,"updatedAt":42},"d856559a-03ff-40b4-980d-3f272b998c3c",{"id":281,"name":282,"slug":282,"createdAt":128,"updatedAt":42},"692d5d68-b188-4e5c-aca8-65d0229399a1","渐变",{"id":284,"name":106,"slug":106,"createdAt":128,"updatedAt":42},"38e1fd6b-d7c6-4d62-bf70-7bacc175bea9",{"id":286,"name":287,"slug":287,"createdAt":288,"updatedAt":42},"be7b10bc-49eb-4a03-bea7-ceb915d500fe","规范","2022-07-16T14:41:06.000Z",{"id":290,"name":291,"slug":291,"createdAt":163,"updatedAt":42},"b42e2916-ad62-4b8a-a863-cd8c19a829de","面试",{"id":293,"name":294,"slug":294,"createdAt":163,"updatedAt":42},"7069add9-b636-44f1-9cd4-ea3a6d2b85d3","面试题",104,48,[298,310,322,335,348],{"id":299,"title":300,"slug":300,"content":301,"excerpt":300,"coverImage":302,"status":9,"isPinned":10,"pinnedAt":11,"viewCount":303,"publishedAt":304,"createdAt":304,"updatedAt":305,"category":306,"author":307,"tags":308},"a1bd1f49-6f6d-4fea-9789-b5636e19a6b3","uni-app瀑布流","## 实现思路\n> 获取父组件的列表数组，watch监听数组长度变化，截取后面新的数据，创建两个左右数组，比较左右dom的长度，哪个短，就push一条数据进去，源数组删除一条数据。利用img的load（加载成功）和error方法（加载失败），触发数组的push，实现瀑布流\n\n## 代码实现\n\n```language\n\u003Ctemplate>\n    \u003Cview class=\\\"waterfall\\\">\n        \u003Cview class=\\\"waterfall_left\\\">\n            \u003Cview class=\\\"waterfall_list\\\" v-for=\\\"(item, index) in leftList\\\" :key=\\\"index\\\">\n                \u003CSearch\n                    :name=\\\"item.name\\\"\n                    :image=\\\"item.src\\\"\n                    :label=\\\"item.label\\\"\n                    :item=\\\"item\\\"\n                    @considerPush=\\\"considerPush\\\"\n                >\n                \u003C\u002FSearch>\n            \u003C\u002Fview>\n        \u003C\u002Fview>\n        \u003Cview class=\\\"waterfall_right\\\">\n            \u003Cview class=\\\"waterfall_list\\\" v-for=\\\"(item, index) in rightList\\\" :key=\\\"index\\\">\n                \u003CSearch\n                    :name=\\\"item.name\\\"\n                    :image=\\\"item.src\\\"\n                    :label=\\\"item.label\\\"\n                    :item=\\\"item\\\"\n                    @considerPush=\\\"considerPush\\\"\n                >\n                \u003C\u002FSearch>\n            \u003C\u002Fview>\n        \u003C\u002Fview>\n    \u003C\u002Fview>\n\u003C\u002Ftemplate>\n\n\u003Cscript>\nimport Search from '@\u002Fcomponents\u002Fsearch\u002Fsearch.vue';\nexport default {\n    components: { Search },\n    props: {\n        list: {\n            type: Array,\n            default: () => []\n        }\n    },\n    data() {\n        return {\n            \u002F\u002F 左侧列表\n            leftList: [],\n            \u002F\u002F 右侧列表\n            rightList: [],\n            \u002F\u002F 组件数据备份\n            newList: [],\n            \u002F\u002F默认请求数,主要为了正常排序\n            interceptNumber: 10\n        };\n    },\n    created() {\n        this.touchOff(); \u002F\u002F 触发排列\n    },\n    mounted() {},\n    watch: {\n        list(newValue, oldValue) {\n            this.interceptNumber = newValue.length - oldValue.length;\n            this.touchOff();\n        }\n    },\n    computed: {},\n    methods: {\n        \u002F\u002F 触发重新排列\n        touchOff() {\n            this.newList = [...this.list.slice(-this.interceptNumber)];\n            if (this.newList.length !== 0) {\n                this.leftList.push(this.newList.shift()); \u002F\u002F触发排列\n            }\n        },\n        \u002F\u002F 计算排列\n        considerPush() {\n            this.$nextTick(() => {\n                if (this.newList.length == 0) return; \u002F\u002F没有数据了\n                let leftH = 0;\n                let rightH = 0; \u002F\u002F左右高度\n                let query = uni.createSelectorQuery().in(this);\n                query.selectAll('.waterfall_left').boundingClientRect();\n                query.selectAll('.waterfall_right').boundingClientRect();\n                query.exec(res => {\n                    leftH = res[0].length != 0 ? res[0][0].height : 0; \u002F\u002F防止查询不到做个处理\n                    rightH = res[1].length != 0 ? res[1][0].height : 0;\n                    if (leftH == rightH || leftH \u003C rightH) {\n                        \u002F\u002F 相等 || 左边小\n                        this.leftList.push(this.newList.shift());\n                    } else {\n                        \u002F\u002F 右边小\n                        this.rightList.push(this.newList.shift());\n                    }\n\n                    \u002F\u002F console.log('左右高度：', leftH, rightH, leftH == rightH || leftH \u003C rightH);\n                });\n            });\n        }\n    }\n};\n\u003C\u002Fscript>\n\n\u003Cstyle scoped lang=\\\"scss\\\">\n.waterfall {\n    display: flex;\n    align-items: flex-start;\n    justify-content: flex-start;\n    .waterfall_left {\n        flex: 1;\n    }\n\n    .waterfall_right {\n        flex: 1;\n    }\n}\n\u003C\u002Fstyle>\n\n```\n","https:\u002F\u002Fcdn.xiaolong0418.com\u002Fmyblog\u002Fimages\u002F7d4fa8d1d2775177b882a4656e3a5ed5.png",1826,"2022-11-22T07:54:41.000Z","2026-06-28T18:42:08.612Z",{"id":16,"name":17,"slug":18},{"id":20,"name":21,"avatar":11},[309],{"id":24,"name":25,"slug":26},{"id":311,"title":312,"slug":312,"content":313,"excerpt":312,"coverImage":314,"status":9,"isPinned":10,"pinnedAt":11,"viewCount":315,"publishedAt":316,"createdAt":316,"updatedAt":317,"category":318,"author":319,"tags":320},"b2c46bf6-d971-4cce-b21b-052dbea8e8a2","v-html使用img点击实现放大效果","## 代码实现\n```js\n\u002F**\n * JS获取html代码中所有的图片地址\n * @param htmlstr\n * @returns arr 数组\n *\u002F\n\nexport function getimgsrc(htmlstr) {\n    let reg = \u002F\u003Cimg.+?src=('|\\\")?([^'\\\"]+)('|\\\")?(?:\\s+|>)\u002Fg;\n    let arr = [];\n    let tem = 0;\n    \u002F\u002Feslint-disable-next-line\n    while ((tem = reg.exec(htmlstr))) {\n        arr.push(tem[2]); \u002F\u002F eslint-disable-line\n    }\n\n    return arr;\n}\n\n```\n\n\n\n```vue\n\u003Ctemplate>\n    \u003Cdiv class=\\\"image-expansion\\\" :class=\\\"classArr\\\">\n        \u003Cdiv @click.stop=\\\"hanldeImage($event)\\\" v-html=\\\"formatHtmlData\\\">\u003C\u002Fdiv>\n\n        \u003Cel-image-viewer\n            v-if=\\\"imgPreviewUrl\\\"\n            :initial-index=\\\"subscript\\\"\n            :src=\\\"imgPreviewUrl\\\"\n            :on-close=\\\"closeViewer\\\"\n            :url-list=\\\"imgList\\\"\n        >\u003C\u002Fel-image-viewer>\n    \u003C\u002Fdiv>\n\u003C\u002Ftemplate>\n\n\u003Cscript>\nimport { getimgsrc } from '..\u002F..\u002Futils\u002Fgetimgsrc';\nimport ElImageViewer from 'element-ui\u002Fpackages\u002Fimage\u002Fsrc\u002Fimage-viewer';\nexport default {\n    components: {\n        ElImageViewer\n    },\n    props: {\n        htmlData: {\n            type: String,\n            default: () => {\n                return '';\n            }\n        },\n        classArr: {\n            type: Array,\n            default: () => {\n                return ['min'];\n            }\n        },\n\n        isArticle: {\n            type: Boolean,\n            default: () => {\n                return false;\n            }\n        }\n    },\n    data() {\n        return {\n            imgList: [],\n            formatHtmlData: '',\n            imgPreviewUrl: '',\n            subscript: 0\n        };\n    },\n    computed: {},\n\n    watch: {\n        \u002F\u002F监听数据，防止数据不更新\n        htmlData: {\n            handler(newName, oldName) {\n                \u002F\u002F判断是否为文章\n                if (this.isArticle) {\n                    newName ? (this.formatHtmlData = newName.replace(\u002F(\u003C([^>]+)>)\u002Fgi, '').replace(\u002F[\\\r\\\n]\u002Fg, '')) : '';\n                } else {\n                    \u002F\u002F剔除strong和p标签\n                    newName ? (this.formatHtmlData = newName.replace(\u002F(\u003C\\\u002F?strong.*?>)|(\u003C\\\u002F?p.*?>)\u002Fg, '')) : '';\n\n                    \u002F\u002F获取html全部图片，push成图片数组\n                    this.imgList = Object.values(getimgsrc(this.formatHtmlData));\n                    \u002F\u002F获取图片下标\n                    let subscript = this.imgList.indexOf(this.imgPreviewUrl);\n                    this.subscript = subscript > -1 ? subscript : 0;\n                }\n            },\n\n            immediate: true\n        }\n    },\n\n    mounted() {},\n\n    methods: {\n        \u002F\u002F监听点击事件\n        hanldeImage(event) {\n            if (event.target.nodeName === 'IMG' || event.target.nodeName === 'img') {\n                \u002F\u002F获取点击的图片url,decodeURIComponent转码一下，防禁url转码\n                this.imgPreviewUrl = decodeURIComponent(event.target.currentSrc);\n\n                \u002F\u002F获取图片下标\n                let subscript = this.imgList.indexOf(this.imgPreviewUrl);\n                this.subscript = subscript > -1 ? subscript : 0;\n\n                \u002F\u002F禁止遮罩层后面的内容滚动\n                document.documentElement.style.overflowY = 'hidden';\n            } else {\n                this.$emit('goDetail');\n            }\n        },\n\n        \u002F\u002F关闭弹框\n        closeViewer() {\n            this.imgPreviewUrl = '';\n            \u002F\u002F恢复遮罩层后面的内容滚动\n            document.documentElement.style.overflowY = 'auto';\n        }\n    }\n};\n\u003C\u002Fscript>\n\n\u003Cstyle lang=\\\"scss\\\" scoped>\n.image-expansion {\n}\n\n.min {\n    \u002Fdeep\u002F img {\n        cursor: pointer;\n        height: 28px;\n        padding: 0 10px 3px;\n    }\n}\n\n.max {\n    \u002Fdeep\u002F img {\n        cursor: pointer;\n    }\n}\n\n.class1 {\n    \u002Fdeep\u002F div {\n        font-size: 15px;\n        font-family: Microsoft YaHei;\n        font-weight: 400;\n        color: #888888;\n        line-height: 30px;\n    }\n}\n\u003C\u002Fstyle>\n\n\n```\n","https:\u002F\u002Fcdn.xiaolong0418.com\u002Fmyblog\u002Fimages\u002Fc77c3fb113d1ab2f67e7afba1ca33b95.png",1579,"2023-01-10T07:22:29.000Z","2026-06-28T18:44:45.012Z",{"id":88,"name":89,"slug":90},{"id":20,"name":21,"avatar":11},[321],{"id":244,"name":245,"slug":245},{"id":323,"title":324,"slug":325,"content":326,"excerpt":324,"coverImage":327,"status":9,"isPinned":10,"pinnedAt":11,"viewCount":328,"publishedAt":329,"createdAt":329,"updatedAt":330,"category":331,"author":332,"tags":333},"9f33b49b-0785-4404-9a4e-d85937e7fc92","在 vue3 中优雅的使用 jsx\u002Ftsx","在-vue3-中优雅的使用-jsx-tsx","## 安装插件（@vitejs\u002Fplugin-vue-jsx）\n```shell\npnpm add @vitejs\u002Fplugin-vue-jsx -D\n```\n\n## 配置vite.config.ts\n```ts\nimport vueJsx from \\\"@vitejs\u002Fplugin-vue-jsx\\\";\n\nexport default defineConfig({\n  plugins: [\n    vueJsx(),\n  ]\n})\n```\n\n## 插值\n```language\n\u002F\u002F vue3模板语法\n\u003Cspan>{{ a + b }}\u003C\u002Fspan>\n\n\u002F\u002F jsx\u002Ftsx\n\u003Cspan>{ a + b }\u003C\u002Fspan>\n```\n\n\n## class与style 绑定\n\n```ts\n\u002F\u002F 模板字符串\n\u003Cdiv className={`header ${ isBg ? 'headerBg' : '' }`}>header\u003C\u002Fdiv>\n\u002F\u002F数组\n\u003Cdiv class={ [ 'header', isBg && 'headerBg' ] } >header\u003C\u002Fdiv>\n```\n\n```ts\nconst color = 'red'\nconst element = \u003Csapn style={{ color, fontSize: '16px' }}>style\u003C\u002Fsapn>\n```\n\n## 条件渲染\n\n```ts\n   setup() {\n       const isShow = false\n       const element = () => {\n           if (isShow) {\n               return \u003Cspan>我是if\u003C\u002Fspan>\n           } else {\n               return \u003Cspan>我是else\u003C\u002Fspan>\n           }\n       }\n       return () => (\n           \u003Cdiv>\n               \u003Cspan v-show={isShow}>我是v-show\u003C\u002Fspan>\n               {\n                   element()\n               }\n               {\n                   isShow ? \u003Cp>我是三目1\u003C\u002Fp> : \u003Cp>我是三目2\u003C\u002Fp>\n               }\n           \u003Cdiv>\n       )\n   }\n```\n\n## 列表渲染\n```language\nsetup() {\n   const listData = [\n       {name: 'Tom', age: 18},\n       {name: 'Jim', age: 20},\n       {name: 'Lucy', age: 16}\n   ]\n   return () => (\n       \u003Cdiv>\n           \u003Cdiv class={'box'}>\n               \u003Cspan>姓名\u003C\u002Fspan>\n               \u003Cspan>年龄\u003C\u002Fspan>\n           \u003C\u002Fdiv>\n           {\n               prop.listData.map(item => {\n                   return \u003Cdiv class={'box'}>\n                       \u003Cspan>{item.name}\u003C\u002Fspan>\n                       \u003Cspan>{item.age}\u003C\u002Fspan>\n                   \u003C\u002Fdiv>\n               })\n           }\n       \u003C\u002Fdiv>\n   )\n}\n\n```\n\n## 事件处理\n\n```language\nsetup() {\n    const clickBox = val => {\n        console.log(val)\n    }\n    return () => (\n        \u003Cdiv class={'box1'} onClick={() => clickBox('box1')}>\n            \u003Cspan>我是box1\u003C\u002Fspan>\n            \u003Cdiv class={'box2'} onClick={() => clickBox('box2')}>\n                \u003Cspan>我是box2\u003C\u002Fspan>\n                \u003Cdiv class={'box3'} onClick={withModifiers(() => clickBox('box3'), ['stop'])}>我是box3\u003C\u002Fdiv>\n            \u003C\u002Fdiv>\n        \u003C\u002Fdiv>\n    )\n}\n```\n\n## v-model\n\n```ts\n\u002F\u002F 正常写法\n\u003Cinput v-model=\\\"value\\\" \u002F> \u002F\u002F vue\n\u003Cinput v-model={value} \u002F> \u002F\u002F jsx\n\n\u002F\u002F 指定绑定值写法\n\u003Cinput v-model:modelValue=\\\"value\\\" \u002F> \u002F\u002F vue\n\u003Cinput v-model={[value,'modelValue']} \u002F> \u002F\u002F jsx\n\n\u002F\u002F 修饰符写法\n\u003Cinput v-model:modelValue.trim=\\\"value\\\" \u002F> \u002F\u002F vue\n\u003Cinput v-model={[value,'modelValue',['trim']]} \u002F> \u002F\u002F jsx\n```\n\n## slot插槽\n\n### 定义插槽\n```ts\nimport { renderSlot } from \\\"vue\\\"\nexport default defineComponent({\n    \u002F\u002F 从ctx中解构出来 slots\n    setup(props, { slots }) {\n        return () => (\n            \u003Cdiv>\n                { renderSlot(slots, 'default') }\n                { slots.title?.() }\n            \u003C\u002Fdiv>\n        )\n    }\n})\n\n```\n\n### 使用插槽\n\n```ts\nimport Vslot from '.\u002FslotTem'\nexport default defineComponent({\n    setup() {\n        return () => (\n            \u003Cdiv class={'box'}>\n                \u003CVslot v-slots={{\n                    title: () => {\n                        return \u003Cp>我是title插槽\u003C\u002Fp>\n                    },\n                    default: () => {\n                        return \u003Cp>我是default插槽\u003C\u002Fp>\n                    }\n                }} \u002F>\n            \u003C\u002Fdiv>\n        )\n    }\n})\n\n```\n\n","https:\u002F\u002Fcdn.xiaolong0418.com\u002Fmyblog\u002Fimages\u002F3e4cb0d3df611ee3f57b8ed503e1015e.png",1398,"2023-04-19T09:23:27.000Z","2026-06-28T18:43:05.229Z",{"id":58,"name":59,"slug":60},{"id":20,"name":21,"avatar":11},[334],{"id":213,"name":59,"slug":60},{"id":336,"title":337,"slug":338,"content":339,"excerpt":337,"coverImage":340,"status":9,"isPinned":10,"pinnedAt":11,"viewCount":341,"publishedAt":342,"createdAt":342,"updatedAt":343,"category":344,"author":345,"tags":346},"1dcdd755-0e46-45a3-8998-9a213fd3fcd5","Vue3 导入导出Excel","vue3-导入导出excel","## 安装\n```shell\npnpm add -S XLSX\n```\n\n\n## 方法封装\n```js\nimport * as XLSX from 'xlsx';\n\n\u002F\u002F参数说明\n\u002F\u002Fconfiguration: {\n\u002F\u002F  data: [], \u002F\u002F 导出的数据\n\u002F\u002F  head: {}, \u002F\u002F 导出的数据对应的表头\n\u002F\u002F  name: '', \u002F\u002F 导出的文件名\n\u002F\u002F  label: '', \u002F\u002F 导出的表单名\n\u002F\u002F  widthArr: [], \u002F\u002F 导出的表单列宽\n\u002F\u002F}\n\n\u002F\u002F 导出excel\nexport const ExportXlsx = (configuration) => {\n  const { data, head, name, label, widthArr } = configuration;\n\n  const list = data.map((item) => {\n    const obj = {};\n    for (const k in item) {\n      if (head[k]) {\n        obj[head[k]] = item[k];\n      }\n    }\n    return obj;\n  });\n\n  \u002F\u002F 创建工作表\n  const xLSXData = XLSX.utils.json_to_sheet(list);\n  \u002F\u002F 创建工作簿\n  const wb = XLSX.utils.book_new();\n  \u002F\u002F 将工作表放入工作簿中\n  XLSX.utils.book_append_sheet(wb, xLSXData, label);\n  xLSXData['!cols'] = [];\n  \u002F\u002F 设置列宽\n  widthArr.forEach((item) => {\n    xLSXData['!cols'].push({ wpx: item });\n  });\n\n  \u002F\u002F 生成文件并下载\n  XLSX.writeFile(wb, `${name}.xlsx`);\n};\n\n\u002F\u002F 导入excel\nexport const ImportXlsx = (e) => {\n  const file = e.target.files[0];\n  const reader = new FileReader();\n  reader.readAsArrayBuffer(file);\n  reader.onload = (e) => {\n    const data = e.target.result;\n    const workbook = XLSX.read(data, { type: 'binary', cellDates: true });\n    const wsname = workbook.SheetNames[0];\n    const outdata = XLSX.utils.sheet_to_json(workbook.Sheets[wsname]);\n    console.log(outdata);\n  };\n};\n\n```\n","https:\u002F\u002Fcdn.xiaolong0418.com\u002Fmyblog\u002Fimages\u002F80231a326d3846b895a7d46c99e738ce.png",1341,"2023-03-14T06:18:59.000Z","2026-06-28T18:43:15.252Z",{"id":16,"name":17,"slug":18},{"id":20,"name":21,"avatar":11},[347],{"id":24,"name":25,"slug":26},{"id":349,"title":350,"slug":351,"content":352,"excerpt":350,"coverImage":353,"status":9,"isPinned":10,"pinnedAt":11,"viewCount":354,"publishedAt":355,"createdAt":355,"updatedAt":356,"category":357,"author":361,"tags":362},"80920598-a452-4357-bf53-842b200560e8","React18入门到精通教程","react18入门到精通教程","\n## JSX实现列表渲染\n> 使用`map()`方法遍历数组，必须添加`key`属性提高性能\n```jsx\nconst songs = [\n  { id: 1, name: \\\"helo1\\\" },\n  { id: 2, name: \\\"helo2\\\" },\n  { id: 3, name: \\\"helo3\\\" },\n];\n\nfunction App() {\n  return (\n    \u003Cdiv>\n      \u003Cul>\n        {songs.map((song) => (\n          \u002F\u002F 关键：添加唯一key标识符（避免使用索引）\n          \u003Cli key={song.id}>  \n            {song.id}-{song.name}\n          \u003C\u002Fli>\n        ))}\n      \u003C\u002Ful>\n    \u003C\u002Fdiv>\n  );\n}\n```\n\n**最佳实践：**\n1. 使用`\u003Cul>`包裹列表项\n2. `key`应使用稳定唯一标识（如ID），避免数组索引\n3. 空列表处理：`{songs.length > 0 && ...}` 或 `{songs.map(...) || \u003CEmptyView\u002F>}`\n\n## JSX实现条件渲染\n### 简单逻辑\n```jsx\n\u002F\u002F 三元表达式\n{isLoggedIn ? \u003CDashboard \u002F> : \u003CLoginForm \u002F>}\n\n\u002F\u002F 逻辑短路\n{hasNotification && \u003CNotificationBadge count={5} \u002F>}\n\n\u002F\u002F 空值处理\n{userProfile?.avatar || \u003CDefaultAvatar \u002F>}\n```\n\n### 复杂逻辑\n```jsx\nconst renderContent = (type) => {\n  switch(type) {\n    case 'success': \n      return \u003CSuccessAlert \u002F>;\n    case 'error':\n      return \u003CErrorAlert \u002F>;\n    default:\n      return \u003CInfoAlert \u002F>;\n  }\n}\n\nfunction App() {\n  return (\n    \u003Cdiv className=\\\"container\\\">\n      {renderContent(status)}\n      \n      {\u002F* 另一种模式：立即执行函数 *\u002F}\n      {(() => {\n        if (isLoading) return \u003CSpinner \u002F>;\n        if (isEmpty) return \u003CEmptyState \u002F>;\n        return \u003CDataTable \u002F>;\n      })()}\n    \u003C\u002Fdiv>\n  )\n}\n```\n\n## JSX样式处理\n### 行内样式\n```jsx\n\u002F\u002F 直接对象\n\u003Cdiv style={{ \n  color: 'white', \n  backgroundColor: 'teal',\n  padding: '1rem'\n}}>\n\n\u002F\u002F 样式对象复用\nconst alertStyle = {\n  padding: '15px',\n  borderRadius: '4px',\n  margin: '10px 0'\n};\n\nfunction Alert({ type }) {\n  return (\n    \u003Cdiv style={{\n      ...alertStyle,  \u002F\u002F 扩展运算符合并样式\n      background: type === 'error' ? '#f8d7da' : '#d4edda'\n    }}>\n      {message}\n    \u003C\u002Fdiv>\n  )\n}\n```\n\n### 类名控制（推荐）\n```css\n\u002F* styles.module.css *\u002F\n.card {\n  border: 1px solid #ddd;\n  border-radius: 8px;\n  padding: 20px;\n  box-shadow: 0 2px 4px rgba(0,0,0,0.1);\n}\n\n.highlight {\n  background-color: #ffffe0;\n}\n```\n\n```jsx\nimport styles from '.\u002Fstyles.module.css';\n\nfunction ProductCard({ featured }) {\n  return (\n    \u003Cdiv className={`${styles.card} ${featured ? styles.highlight : ''}`}>\n      {\u002F* 内容 *\u002F}\n    \u003C\u002Fdiv>\n  );\n}\n```\n\n## React 18新特性\n### 并发模式（Concurrent Mode）\n```jsx\nimport { startTransition } from 'react';\n\n\u002F\u002F 非紧急状态更新\nfunction handleSearch(query) {\n  startTransition(() => {\n    setSearchQuery(query); \u002F\u002F 可中断的渲染\n  });\n}\n```\n\n### 自动批处理（Automatic Batching）\n```jsx\n\u002F\u002F React 17及之前：两次渲染\n\u002F\u002F React 18：自动批处理，一次渲染\nfunction handleClick() {\n  setCount(c => c + 1);\n  setFlag(f => !f);\n}\n```\n\n## Redux状态管理（现代写法）\n### 安装依赖\n```bash\nnpm install @reduxjs\u002Ftoolkit react-redux\n```\n\n### 创建Store\n```js\n\u002F\u002F store.js\nimport { configureStore, createSlice } from '@reduxjs\u002Ftoolkit';\n\nconst counterSlice = createSlice({\n  name: 'counter',\n  initialState: { value: 0 },\n  reducers: {\n    increment: state => { state.value += 1 },\n    decrement: state => { state.value -= 1 },\n    incrementByAmount: (state, action) => {\n      state.value += action.payload\n    }\n  }\n});\n\n\u002F\u002F 异步操作示例\nexport const fetchUserData = () => async (dispatch) => {\n  const response = await fetch('\u002Fapi\u002Fuser');\n  dispatch(setUser(await response.json()));\n};\n\nexport const store = configureStore({\n  reducer: {\n    counter: counterSlice.reducer,\n    \u002F\u002F 其他reducer...\n  }\n});\n\nexport const { increment, decrement } = counterSlice.actions;\n```\n\n### 组件集成\n```jsx\n\u002F\u002F index.js\nimport { Provider } from 'react-redux';\nimport { store } from '.\u002Fstore';\n\nroot.render(\n  \u003CProvider store={store}>\n    \u003CApp \u002F>\n  \u003C\u002FProvider>\n);\n\n\u002F\u002F Counter.js\nimport { useSelector, useDispatch } from 'react-redux';\nimport { increment, decrement } from '.\u002Fstore';\n\nfunction Counter() {\n  const count = useSelector(state => state.counter.value);\n  const dispatch = useDispatch();\n\n  return (\n    \u003Cdiv>\n      \u003Cbutton onClick={() => dispatch(decrement())}>-\u003C\u002Fbutton>\n      \u003Cspan>{count}\u003C\u002Fspan>\n      \u003Cbutton onClick={() => dispatch(increment())}>+\u003C\u002Fbutton>\n    \u003C\u002Fdiv>\n  );\n}\n```\n\n## 最佳实践总结\n1. **组件设计**：遵循单一职责原则，拆分智能组件（容器组件）和展示组件\n2. **状态管理**：\n   - 局部状态用`useState`\u002F`useReducer`\n   - 全局共享状态用Redux\n   - 避免过度使用状态提升\n3. **性能优化**：\n   - 使用`React.memo`记忆组件\n   - 使用`useCallback`\u002F`useMemo`避免不必要的重渲染\n   - 虚拟化长列表（react-window）\n4. **Hooks规范**：\n   - 避免在循环\u002F条件中使用Hook\n   - 自定义Hook以`use`前缀命名\n5. **TypeScript集成**：\n   ```tsx\n   interface UserCardProps {\n     name: string;\n     age: number;\n     onSelect: (id: string) => void;\n   }\n   \n   const UserCard: React.FC\u003CUserCardProps> = ({ name, age }) => (\n     \u003Cdiv>{name} ({age})\u003C\u002Fdiv>\n   )\n   ```\n\n下面为您完善教程，增加React路由和生命周期相关内容：\n\n## React路由管理（React Router v6）\n\n### 安装与基础配置\n```bash\nnpm install react-router-dom@6\n```\n\n### 路由基础结构\n```jsx\n\u002F\u002F index.js\nimport { BrowserRouter } from 'react-router-dom';\n\nconst root = ReactDOM.createRoot(document.getElementById('root'));\nroot.render(\n  \u003CBrowserRouter>\n    \u003CApp \u002F>\n  \u003C\u002FBrowserRouter>\n);\n\n\u002F\u002F App.js\nimport { Routes, Route, Link } from 'react-router-dom';\n\nfunction App() {\n  return (\n    \u003Cdiv>\n      \u003Cnav>\n        \u003CLink to=\\\"\u002F\\\">首页\u003C\u002FLink>\n        \u003CLink to=\\\"\u002Fabout\\\">关于\u003C\u002FLink>\n        \u003CLink to=\\\"\u002Fusers\\\">用户列表\u003C\u002FLink>\n      \u003C\u002Fnav>\n      \n      \u003CRoutes>\n        \u003CRoute path=\\\"\u002F\\\" element={\u003CHome \u002F>} \u002F>\n        \u003CRoute path=\\\"\u002Fabout\\\" element={\u003CAbout \u002F>} \u002F>\n        \u003CRoute path=\\\"\u002Fusers\\\" element={\u003CUserList \u002F>} \u002F>\n        \u003CRoute path=\\\"\u002Fusers\u002F:id\\\" element={\u003CUserDetail \u002F>} \u002F>\n        \u003CRoute path=\\\"*\\\" element={\u003CNotFound \u002F>} \u002F>\n      \u003C\u002FRoutes>\n    \u003C\u002Fdiv>\n  );\n}\n```\n\n### 嵌套路由\n```jsx\n\u002F\u002F Dashboard.js\nimport { Outlet } from 'react-router-dom';\n\nfunction Dashboard() {\n  return (\n    \u003Cdiv>\n      \u003Ch2>仪表盘\u003C\u002Fh2>\n      \u003COutlet \u002F> {\u002F* 子路由渲染位置 *\u002F}\n    \u003C\u002Fdiv>\n  );\n}\n\n\u002F\u002F 路由配置\n\u003CRoutes>\n  \u003CRoute path=\\\"\u002Fdashboard\\\" element={\u003CDashboard \u002F>}>\n    \u003CRoute index element={\u003CDashboardHome \u002F>} \u002F>\n    \u003CRoute path=\\\"settings\\\" element={\u003CDashboardSettings \u002F>} \u002F>\n    \u003CRoute path=\\\"analytics\\\" element={\u003CDashboardAnalytics \u002F>} \u002F>\n  \u003C\u002FRoute>\n\u003C\u002FRoutes>\n```\n\n### 编程式导航\n```jsx\nimport { useNavigate, useParams, useLocation } from 'react-router-dom';\n\nfunction UserCard({ user }) {\n  const navigate = useNavigate();\n  \n  return (\n    \u003Cdiv onClick={() => navigate(`\u002Fusers\u002F${user.id}`)}>\n      {user.name}\n    \u003C\u002Fdiv>\n  );\n}\n\nfunction UserDetail() {\n  const { id } = useParams(); \u002F\u002F 获取URL参数\n  const location = useLocation(); \u002F\u002F 获取位置对象\n  \n  return (\n    \u003Cdiv>\n      \u003Ch2>用户ID: {id}\u003C\u002Fh2>\n      \u003Cp>当前路径: {location.pathname}\u003C\u002Fp>\n    \u003C\u002Fdiv>\n  );\n}\n```\n\n### 路由守卫（认证保护）\n```jsx\nimport { Navigate } from 'react-router-dom';\n\nfunction ProtectedRoute({ children }) {\n  const { isAuthenticated } = useAuth();\n  \n  if (!isAuthenticated) {\n    return \u003CNavigate to=\\\"\u002Flogin\\\" replace \u002F>;\n  }\n  \n  return children;\n}\n\n\u002F\u002F 使用\n\u003CRoute \n  path=\\\"\u002Fdashboard\\\" \n  element={\n    \u003CProtectedRoute>\n      \u003CDashboard \u002F>\n    \u003C\u002FProtectedRoute>\n  } \n\u002F>\n```\n\n## React生命周期\n\n### 类组件生命周期方法\n\n```jsx\nclass LifecycleDemo extends React.Component {\n  \u002F\u002F 1. 初始化阶段\n  constructor(props) {\n    super(props);\n    this.state = { count: 0 };\n    console.log('Constructor');\n  }\n\n  \u002F\u002F 2. 挂载阶段\n  componentDidMount() {\n    console.log('Component did mount');\n    \u002F\u002F 适合进行API调用、事件订阅\n    this.timer = setInterval(() => {\n      this.setState(prev => ({ count: prev.count + 1 }));\n    }, 1000);\n  }\n\n  \u002F\u002F 3. 更新阶段\n  shouldComponentUpdate(nextProps, nextState) {\n    console.log('Should component update?');\n    return nextState.count !== this.state.count;\n  }\n\n  componentDidUpdate(prevProps, prevState) {\n    console.log('Component did update');\n  }\n\n  \u002F\u002F 4. 卸载阶段\n  componentWillUnmount() {\n    console.log('Component will unmount');\n    \u002F\u002F 清理操作\n    clearInterval(this.timer);\n  }\n\n  render() {\n    console.log('Render');\n    return \u003Cdiv>Count: {this.state.count}\u003C\u002Fdiv>;\n  }\n}\n```\n\n### 函数组件生命周期（Hooks实现）\n\n```jsx\nimport { useState, useEffect } from 'react';\n\nfunction FunctionLifecycle() {\n  const [count, setCount] = useState(0);\n  const [data, setData] = useState(null);\n\n  \u002F\u002F 相当于componentDidMount + componentDidUpdate\n  useEffect(() => {\n    console.log('每次渲染后执行');\n  });\n\n  \u002F\u002F 相当于componentDidMount\n  useEffect(() => {\n    console.log('组件挂载后执行');\n    \n    \u002F\u002F 数据获取\n    fetch('\u002Fapi\u002Fdata')\n      .then(res => res.json())\n      .then(setData);\n    \n    \u002F\u002F 相当于componentWillUnmount\n    return () => {\n      console.log('组件卸载前执行');\n    };\n  }, []); \u002F\u002F 空依赖数组\n\n  \u002F\u002F 依赖变化时执行\n  useEffect(() => {\n    console.log('count变化时执行:', count);\n    \n    document.title = `Count: ${count}`;\n    \n    return () => {\n      console.log('清理count效果');\n    };\n  }, [count]); \u002F\u002F count依赖\n\n  return (\n    \u003Cdiv>\n      \u003Cp>Count: {count}\u003C\u002Fp>\n      \u003Cbutton onClick={() => setCount(c => c + 1)}>增加\u003C\u002Fbutton>\n      {data && \u003Cpre>{JSON.stringify(data, null, 2)}\u003C\u002Fpre>}\n    \u003C\u002Fdiv>\n  );\n}\n```\n\n### 生命周期阶段对比\n\n| 阶段 | 类组件方法 | 函数组件Hook |\n|------|------------|--------------|\n| **挂载** | constructor | useState初始化 |\n|       | render      | 函数体执行    |\n|       | componentDidMount | useEffect(() => {}, []) |\n| **更新** | shouldComponentUpdate | React.memo, useMemo |\n|       | render      | 函数体执行    |\n|       | componentDidUpdate | useEffect(() => {}) |\n| **卸载** | componentWillUnmount | useEffect返回函数 |\n| **错误处理** | componentDidCatch | 暂无直接等效，需错误边界组件 |\n\n### 现代React开发建议\n\n1. **优先使用函数组件+Hooks**：\n   - 90%的场景可替代类组件\n   - 更简洁的代码结构\n   - 更好的逻辑复用\n\n2. **关键生命周期替代**：\n   - `componentDidMount` → `useEffect(() => {}, [])`\n   - `componentDidUpdate` → `useEffect(() => {})` 或带依赖的 `useEffect`\n   - `componentWillUnmount` → `useEffect(() => { return cleanup }, [])`\n   - `shouldComponentUpdate` → `React.memo` 或 `useMemo`\n\n3. **数据获取最佳实践**：\n```jsx\nuseEffect(() => {\n  let isMounted = true;\n  \n  const fetchData = async () => {\n    try {\n      const result = await api.getData();\n      if (isMounted) setData(result);\n    } catch (error) {\n      if (isMounted) setError(error);\n    }\n  };\n  \n  fetchData();\n  \n  return () => {\n    isMounted = false; \u002F\u002F 避免组件卸载后设置状态\n  };\n}, []);\n```\n\n## 路由与生命周期整合示例\n\n```jsx\nfunction UserProfile() {\n  const { id } = useParams();\n  const [user, setUser] = useState(null);\n  const [loading, setLoading] = useState(true);\n\n  useEffect(() => {\n    let isActive = true;\n    \n    const fetchUser = async () => {\n      try {\n        setLoading(true);\n        const data = await fetchUserById(id);\n        if (isActive) {\n          setUser(data);\n          setLoading(false);\n        }\n      } catch (error) {\n        if (isActive) {\n          setError(error.message);\n          setLoading(false);\n        }\n      }\n    };\n    \n    fetchUser();\n    \n    return () => {\n      isActive = false; \u002F\u002F 清理效果\n    };\n  }, [id]); \u002F\u002F id变化时重新获取\n\n  if (loading) return \u003CSpinner \u002F>;\n  \n  return (\n    \u003Cdiv>\n      \u003Ch2>{user.name}\u003C\u002Fh2>\n      \u003Cp>Email: {user.email}\u003C\u002Fp>\n    \u003C\u002Fdiv>\n  );\n}\n```\n\n## 完整项目结构建议\n\n```\nsrc\u002F\n├── components\u002F      # 通用UI组件\n├── pages\u002F           # 页面组件\n├── layouts\u002F         # 布局组件\n├── hooks\u002F           # 自定义Hooks\n├── store\u002F           # Redux状态\n│   ├── slices\u002F\n│   └── store.js\n├── services\u002F        # API服务\n├── routers\u002F         # 路由配置\n├── utils\u002F           # 工具函数\n├── assets\u002F          # 静态资源\n└── App.js           # 主应用组件\n```\n\n这些新增内容涵盖了React路由的现代用法（v6版本）以及React生命周期的详细解释，包括类组件和函数组件的实现方式对比。同时还提供了路由与生命周期整合的实际示例，帮助开发者理解如何在真实项目中应用这些概念。","https:\u002F\u002Fcdn.xiaolong0418.com\u002Fmyblog\u002Fimages\u002F46e205aa1bd33d1bb7201019fc2fdf43.png",1156,"2023-02-21T02:01:52.000Z","2026-06-28T18:41:50.200Z",{"id":358,"name":359,"slug":360},"f1701085-b8c1-413a-8750-58e7a0a33832","React","react",{"id":20,"name":21,"avatar":11},[363],{"id":181,"name":182,"slug":183},{"list":365,"total":34,"page":36,"pageSize":366},[],20]