一切福田，不離方寸，從心而覓，感無不通。

Category Archives: Frontend

最全的TypeScript学习指南

前言 Hello 大家好 我是鲨鱼哥 这次给大家带来的是我曾经非常嫌弃 如今却爱不释手的 TS 技术 哈哈 大家看往期文章可能已经发现鲨鱼哥之前主要是 Vue 技术栈的 然后因为 Vue2 和 TS 的结合总感觉不是很丝滑 所以我果断就在技术选型的时候去掉了 TS（其实我是觉得用起来很烦 和我之前最讨厌的 eslint 一样 各种报错让人不爽）但是 鲨鱼哥今年换了新公司 开启了全新的 react hook+ts 这一套组合拳 然后在重新认真学习并在项目里用上了 ts 之后 确实真香 哈哈 最直观的感受就是可以帮我们规避很多类型错误 更友好的提示 甚至有些方法我们根据定义的类型大概就知道作用是什么了（去掉了写注释的麻烦）况且如今大火的 Vue3 也是 TS 重构的 然后 react 和 ts 的结合就更不必说了 所以还没有开始 ts 的同学就从现在开始跟着鲨鱼哥一起来学习吧 最后欢迎大家点击 链接 加入到鲨鱼哥的前端群 内推 讨论技术 摸鱼 求助 皆可 整理不易 如果觉得本文有帮助 记得点赞三连哦 十分感谢！ 1 ts 安装和编译 第一步 新建一个空文件夹用来学习 ts 第二步 全局安装 ts 和 ts-node

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cnpm i typescript -g //全局安装ts
cnpm i -g ts-node //全局安装ts-node

  第三步 生成 tsconfig.js 配置文件

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tsc --init

  我们就先按照自动生成的 tsconfig 配置项去使用 里面的配置咱们可以先不去管他 后续熟练了再去配置 第四步 在项目下新建一个index.ts 直接写入

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const a: string = "hello";
console.log(a);

[…]

龙生   03 Dec 2021
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TypeScript+Vue实例完全教程

功能 轮播 搜索 列表 懒加载 简单动画 loading vue-router.ts vuex.ts vue-class-component使用 vuex-class使用 xxx.d.ts声明文件 基于类的编写方式 mock数据 tsconfig.json webpack配置 vue-typescript-cli 项目地址：https://github.com/SimonZhangITer/vue-typescript-dpapp-demo 完成后的简单例子 基于类的写法加上静态类型检查，简直不能再嗨

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<script lang="ts">
import Vue from "vue";
import Component from "vue-class-component";
import { State } from "vuex-class";
 
@Component
export default class Shops extends Vue {
  @State shops: StoreState.shop[];
  @State searchVal: string;
 
  get shopList(): StoreState.shop[] {
    const shops = this.shops;
    const searchVal = this.searchVal;
    return shops.filter(
      (el: StoreState.shop) => el.shopName.indexOf(searchVal) > -1
    );
  }
}
</script>

  为什么使用TypeScript JavaScript的超集 支持所有原生JavaScript的语法 强类型语言 现在很多主流语言都是强类型的，而这点也一直是JavaScript所被人诟病的地方。使用TypeScript之后，将会在代码调试、重构等步骤节省很多时间。 比如说：函数在返回值的时候可能经过复杂的操作，那我们如果想要知道这个值的结构就需要去仔细阅读这段代码。那如果有了TypeScript之后，直接就可以看到函数的返回值结构，将会非常的方便 强大的IDE支持 现在的主流编辑器如VSCode、WebStorm、Atom、Sublime等都对TypeScript有着非常友好的支持，主要体现在智能提示上，非常的方便 可运行于任何浏览器、计算机、操作系统 强大的编译引擎 迭代更新快 不断更新，提供更加方便友好的Api 微软和Google爸爸 TypeScript是微软开发的语言，而Google的Angular使用的就是TypeScript，所以不用担心会停止维护，至少在近几年内TypeScript都会一门主流开发语言 npm下载量非常高 截止2017.12.17, TypeScript在全球范围内的npm日均下载量在30w左右，这个数字将近是vue下载量的10倍，可见TypeScript还是非常受欢迎的 TypeScript配置 本项目已经配置完毕，这里记录一下当时的踩坑过程 1. Webpack 首先需要安装ts-loader，这是TypeScript为Webpack提供的编译器，类似于babel-loader

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npm i ts-loader -D

  接着在Webpack的module.rules里面添加对ts的支持(我这里的webpack版本是2.x)：

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{
    test: /\.vue$/,
    loader: 'vue-loader',
    options: vueLoaderConfig
},
{
    test: /\.tsx?$/,
    exclude: /node_modules/,
    use: [
      "babel-loader",
      {
        loader: "ts-loader",
        options: { appendTsxSuffixTo: [/\.vue$/] }
      }
    ]
}

  2. tsconfig.json 创建tsconfig.json文件，放在根目录下，和package.json同级 配置内容主要也看个人需求，具体可以去typescript的官网查看，但是有一点需要注意： 在Vue中，你需要引入 strict: true (或者至少 noImplicitThis: true，这是 strict 模式的一部分) 以利用组件方法中 this 的类型检查，否则它会始终被看作 any 类型。 这里列出我的配置，功能在注释中给出

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{
  "include": [
    "src/*",
    "src/**/*"
  ],
  "exclude": [
    "node_modules"
  ],
  "compilerOptions": {
    // types option has been previously configured
    "types": [
      // add node as an option
      "node"
    ],
    // typeRoots option has been previously configured
    "typeRoots": [
      // add path to @types
      "node_modules/@types"
    ],
    // 以严格模式解析
    "strict": true,
    // 在.tsx文件里支持JSX
    "jsx": "preserve",
    // 使用的JSX工厂函数
    "jsxFactory": "h",
    // 允许从没有设置默认导出的模块中默认导入
    "allowSyntheticDefaultImports": true,
    // 启用装饰器
    "experimentalDecorators": true,
    "strictFunctionTypes": false,
    // 允许编译javascript文件
    "allowJs": true,
    // 采用的模块系统
    "module": "esnext",
    // 编译输出目标 ES 版本
    "target": "es5",
    // 如何处理模块
    "moduleResolution": "node",
    // 在表达式和声明上有隐含的any类型时报错
    "noImplicitAny": true,
    "lib": [
      "dom",
      "es5",
      "es6",
      "es7",
      "es2015.promise"
    ],
    "sourceMap": true,
    "pretty": true
  }
}

  3. 修改main.js 把项目主文件main.js修改成main.ts，里面的写法基本不变，但是有一点需要注意： 引入Vue文件的时候需要加上.vue后缀,否则编辑器识别不到 把webpack的entry文件也修改成main.ts 4. vue-shims.d.ts TypeScript并不支持Vue文件，所以需要告诉TypeScript*.vue文件交给vue编辑器来处理。解决方案就是在创建一个vue-shims.d.ts文件，建议放在src目录下再创建一个typings文件夹，把这个声明文件放进去，如：src/typings/vue-shims.d.ts，文件内容： *.d.ts类型文件不需要手动引入，TypeScript会自动加载

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declare module '*.vue' {
  import Vue from 'vue'
  export default Vue
}

  到这里TypeScript在Vue中配置就完成了，可以愉快的撸代码了~ 第三方插件库 现在Vue官方已经明确提出支持TypeScript，并考虑出一个对应的vue-cli，在这之前，Vue开发团队已经开发出了一些插件库来支持TypeScript，这里简单和大家介绍一下。 Vue-Class-Component vue-class-component是官方维护的TypeScript装饰器，写法比较扁平化。Vue对其做到完美兼容，如果你在声明组件时更喜欢基于类的 API，这个库一定不要错过 ps：用了这个装饰器之后写方法不需要额外加逗号，贼嗨~~~

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import Vue from "vue";
import Component from "vue-class-component";
 
@Component
export default class App extends Vue {
  name:string = 'Simon Zhang'
 
  // computed
  get MyName():string {
    return `My name is ${this.name}`
  }
 
  // methods
  sayHello():void {
    alert(`Hello ${this.name}`)
  }
 
  mounted() {
    this.sayHello();
  }
}

[…]

龙生   03 Dec 2021
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解决 Nginx 部署 Vue 项目路由出现 404 的问题

代码如下:

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server {
    listen      80;
    server_name example.com;
 
    location / {
       root /home/example/dist;
       try_files $uri $uri/ @router; # 配置使用路由
       index  index.html index.htm;
    }
    
   # 路由配置信息
   location @router {
     rewrite ^.*$ /index.html last;
   }
}

  from:https://blog.csdn.net/peng2hui1314/article/details/106690852

龙生   05 Nov 2021
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ERROR in xxx.js from UglifyJs

ERROR in xxx.js from UglifyJs 问题 ERROR in app.bundle.js from UglifyJs Unexpected token: name «element», expected: punc «;» [app.bundle.js:106,8] 在用webpack对代码打包的时候报错，在网上找到了类似的答案，还是没有解决我的问题. 能解决大部分问题的链接 https://stackoverflow.com/questions/41254538/error-in-bundle-js-from-uglifyjs http://www.cnblogs.com/aredleave/p/7586911.html https://segmentfault.com/a/1190000011212544 按照以上方法对环境进行重新配置，依然报错！

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ERROR in ./src/index.js
Module build failed (from ./node_modules/babel-loader/lib/index.js):
Error: Cannot find module '@babel/core' babel-loader@8 requires Babel 7.x (the package '@babel/core').
If you'd like to use Babel 6.x ('babel-core'), you should install 'babel-loader@7'.

报错原因 通过代码报错原因是 babel-loader 版本问题，因为 babel-loader 用的最新的版本，和 UglifyJs 不兼容. 解决方法 通过运行下面代码对babel-loader进行重新安装（低版本）. npm install --save-dev babel-loader@7 通过修改后的package.json配置文件，亲测可以正确打包，无报错现象.

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{
  "name": "kankan",
  "version": "1.0.0",
  "description": "kankan",
  "main": "webpack.config.js",
  "scripts": {
    "start": "webpack-dev-server --open --config webpack.dev.js",
    "build": "webpack --config webpack.prod.js"
  },
  "author": "kankan",
  "license": "ISC",
  "devDependencies": {
    "babel": "^6.23.0",
    "babel-core": "^6.26.3",
    "babel-loader": "^7.1.5",
    "babel-preset-es2015": "^6.24.1",
    "clean-webpack-plugin": "^2.0.1",
    "css-loader": "^2.1.1",
    "express": "^4.16.4",
    "html-webpack-plugin": "^3.2.0",
    "style-loader": "^0.23.1",
    "uglifyjs-webpack-plugin": "^2.1.2",
    "webpack": "^4.30.0",
    "webpack-cli": "^3.3.1",
    "webpack-dev-middleware": "^3.6.2",
    "webpack-dev-server": "^3.3.1",
    "webpack-manifest-plugin": "^2.0.4",
    "webpack-merge": "^4.2.1"
  }
}

  奇卡奇卡 哈哈哈 个人主页：https://kankan.fun   from:https://blog.csdn.net/qq_38025939/article/details/89576282

龙生   27 Oct 2021
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vue报错：Module build failed: TypeError: this.getOptions is not a function

vue-cli构建项目使用sass报错 Module build failed: TypeError: this.getOptions is not a function 出现问题的原因是安装的sass-loader版本过高,选择安装较低版本的sass-loader即可。

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npm install sass-loader@7.3.1 --save-dev

  Module build failed: Error: Node Sass version 6.0.1 is incompatible with ^4.0.0. 出现问题的原因是安装的sass版本过高,选择安装4.0+版本的sass即可。

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npm install node-sass@4.14.1 --save-dev

  from:https://www.cnblogs.com/chenjy1225/p/14930870.html

龙生   25 Oct 2021
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vue vue-style-loader !css-loader错误

最近在学习vue框架，使用webpack打包vue项目，在执行npm run start的时候 出现如下错误： This dependency was not found: * !!vue-style-loader!css-loader?{"minimize":false,"sourceMap":false}!../../node_modules/vue-loader/lib/style-compiler/index?{"vue":true,"id":"data-v-1d57e5ea","scoped":false,"hasInlineConfig":false}!stylus-loader?{"sourceMap":false}!../../node_modules/vue-loader/lib/selector?type=styles&index=0!./a.vue in ./src/components/a.vue To install it, you can run: npm install --save !!vue-style-loader!css-loader?{"minimize":false,"sourceMap":false}!../../node_modules/vue-loader/lib/style-compiler/index?{"vue":true,"id":"data-v-1d57e5ea","scoped":false,"hasInlineConfig":false}!stylus-loader?{"sourceMap":false}!../../node_modules/vue-loader/lib/selector?type=styles&index=0!./a.vu   解决思路： npm install sass-loader --save; npm install node-sass --save; 然后运行npm run start就可以   from:https://www.cnblogs.com/hexiaobao/p/8260858.html

龙生   25 Oct 2021
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18 个杀手级 JavaScript 单行代码

1、复制到剪贴板 使用 navigator.clipboard.writeText 轻松将任何文本复制到剪贴板。

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const copyToClipboard = (text) => navigator.clipboard.writeText(text);
copyToClipboard("Hello World");

  2、检查日期是否有效 使用以下代码段检查给定日期是否有效。

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const isDateValid = (...val) => !Number.isNaN(new Date(...val).valueOf());
isDateValid("December 17, 1995 03:24:00");
// Result: true

  3、找出一年中的哪一天 查找给定日期的哪一天。

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const dayOfYear = (date) =>  Math.floor((date - new Date(date.getFullYear(), 0, 0)) / 1000 / 60 / 60 / 24);
dayOfYear(new Date());
// Result: 272

  4、将首字符串大写 Javascript 没有内置的大写函数，因此我们可以使用以下代码。

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const capitalize = str => str.charAt(0).toUpperCase() + str.slice(1)capitalize("follow for more")// Result: Follow for more

  5、找出两日期之间的天数 使用以下代码段查找给定 2 个日期之间的天数。

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  6、清除所有 Cookie 你可以通过使用 document.cookie 访问 cookie 并清除它来轻松清除存储在网页中的所有 cookie。

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const clearCookies = document.cookie.split(';').forEach(cookie => document.cookie = cookie.replace(/^ +/, '')
.replace(/=.*/, `=;expires=${new Date(0).toUTCString()};
path=/`));

  7、生成随机十六进制 你可以使用 Math.random 和 padEnd 属性生成随机十六进制颜色。

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const randomHex = () => `#${Math.floor(Math.random() * 0xffffff).toString(16).padEnd(6, "0")}`
console.log(randomHex());
//Result: #92b008

  8、从数组中删除重复项 你可以使用 JavaScript 中的 Set 轻松删除重复项。

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const removeDuplicates = (arr) => [...new Set(arr)];
console.log(removeDuplicates([1, 2, 3, 3, 4, 4, 5, 5, 6]));
// Result: [ 1, 2, 3, 4, 5, 6 ]

  9、从 URL 获取查询参数 你可以通过传递 window.location 或原始 URL goole.com?search=easy&page=3 从 url 轻松检索查询参数

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const getParameters = (URL) => {
URL = JSON.parse('{"' + decodeURI(URL.split("?")[1]).replace(/"/g, '\"').replace(/&/g, '","').replace(
/=/g, '":"') + '"}');
return JSON.stringify(URL);
};
getParameters(window.location) // Result: { search : "easy", page : 3 }

  10、从日期记录时间 我们可以从给定日期以小时::分钟::秒的格式记录时间。

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const timeFromDate = date => date.toTimeString().slice(0, 8);
console.log(timeFromDate(new Date(2021, 0, 10, 17, 30, 0)));
// Result: "17:30:00"

  11、检查数字是偶数还是奇数

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const isEven = num => num % 2 === 0;console.log(isEven(2));
// Result: True

  12、求数字的平均值 使用 reduce 方法找到多个数字之间的平均值。

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const average = (...args) => args.reduce((a, b) => a + b) / args.length;
average(1, 2, 3, 4);
// Result: 2.5

  13、反转字符串 你可以使用 split、reverse 和 join 方法轻松反转字符串。

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const reverse = str => str.split('').reverse().join('');reverse('hello world');
// Result: 'dlrow olleh'

  14、检查数组是否为空 检查数组是否为空的简单单行程序将返回 true […]

龙生   20 Oct 2021
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vue中加载loading

首先在components文件夹中新建一个loading.vue组件:   1.loading.vue组件内容如下：

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<template>
 
<div class="markbox" v-show="loading" style="background-color: rgba(0, 0, 0, 0.5);">
 
<div class="sun-loading"></div>
 
</div>
 
</template>
 
 
 
<script>
 
export default {
 
name: 'loading',
 
data() {
 
return {
 
loading: false
 
}
 
},
 
created() {
 
var that = this;
 
this.bus.$on('loading', function(data) {
 
that.loading = !!data;
 
})
 
}
 
}
 
</script>

  css代码:

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/*loading开始*/
 
.sun-loading {
 
width: 45px;
 
height: 45px;
 
display: block;
 
animation: sunLoading 1s steps(12, end) infinite;
 
background: transparent 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');
 
background-size: 100%;
 
margin:auto;
 
position:absolute;
 
top: 0;
 
left: 0;
 
bottom: 0;
 
right:0;
 
}
 
/*loading结束*/

   2.app.vue中设置：

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<template>
 
<div id="app">
 
<router-view/>
 
<loading></loading>
 
</div>
 
</template>
 
<script>
 
import loading from '@/components/common/loading'
 
export default {
 
name: 'App',
 
components:{loading}
 
}
 
</script>

  3.在main.js中设置  

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Vue.prototype.bus = new Vue;

  4.在.vue组件中使用

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// 显示loading
 
this.bus.$emit('loading', true);
 
 
 
// 关闭loading
 
this.bus.$emit('loading', false);

  效果如下:   from:https://blog.csdn.net/liangmengbk/article/details/90201596

龙生   27 Sep 2021
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vue中引用vant，附带样式

1、首先 npm install babel-plugin-import 和 npm install vant 2、样式在项目中的  .babelrc 文件下 ["import", {"libraryName": "vant","libraryDirectory": "es","style": true}, "vant"]]  //vant样式引用 3、在main.js中 import { Button } from 'vant'   //引用vant组件库中可用组件 Vue.use(Button )  注册组件即可。 from:https://www.cnblogs.com/1rookie/p/12660684.html

龙生   14 Sep 2021
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还在傻傻分不清ES5、Es6数组方法？各大姿势来袭

前言 初衷： 在面试中，面试官经常问到说一下Es5和Es6的数组方法有哪些，有很多同学老是分不清楚，今天笔者就来分享一下。 适合人群： 前端初级开发 Es5系列 indexOf 用途： 用于查找数组中是否存在某个值，如果存在则返回某个值的下标，否则返回-1

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let list = [1, 2, 3];
 
console.log(list.indexOf(2)) // 1
console.log(list.indexOf("蛙人")) // -1

  map 用途： map是一个数组函数方法，接收三个参数，value，index，self，返回值是处理完的结果。

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let list = [1, 2, 3];
 
const res = list.map((value, key, self) => {
   console.log(value) // 1 2 3
   console.log(key) // 0 1 2
   console.log(self) // [1, 2, 3]
   return value * 2
})
console.log(res)

  forEach 用途： 用于遍历一个数组，接收三个参数，value，index，self，返回值为undefined

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let list = [1, 2, 3];
 
const res = list.forEach((value, key, self) => {
    console.log(value) // 1 2 3
    console.log(key) // 0 1 2
    console.log(self) // [1, 2, 3]
    return 123
})
console.log(res) // undefined

  splice 用途： 用于数组删除或替换内容，接收三个参数： 第一个参数是，删除或添加的位置 第二个参数是，要删除的几位，如果为0则不删除 第三个参数是，向数组添加内容

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let list = [1, 2, 3];
 
list.splice(0, 1) // 把第0个位置，给删除一位
console.log(list) // [2, 3]
 
list.splice(0, 1, "蛙人") // 把第0个位置，给删除一位，添加上一个字符串
console.log(list) // ["蛙人", 2, 3]
 
list.splice(0, 2, "蛙人") // 把第0个位置，给删除2位，添加上一个字符串
console.log(list) // ["蛙人", 3]

  slice 用途： 用于截取数组值，接收两个参数，第一个参数是要获取哪个值的下标，第二个参数是截取到哪个下标的前一位。

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let list = [1, 2, 3];
 
let res = list.slice(1, 3) // 从第一位下标开始截取，到第三位下标的前一位，所以截取出来就是 [2, 3]
console.log(res) // [2, 3]

  filter 用途： 用于过滤数组内的符合条件的值，返回值为满足条件的数组对象

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let list = [1, 2, 3];
 
let res = list.filter(item => item > 1);
console.log(res) // [2, 3]

  every **用途：**用于检测数组所有元素是否都符合指定条件，返回值为Boolean , 该方法是数组中必须全部值元素满足条件返回true，否则false

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let list = [1, 2, 3];
 
let res = list.every(item => item > 0)
console.log(res) // true
 
let res1 = list.every(item => item > 1)
console.log(res1) // false

  some 用途： 用于检测数组中的元素是否满足指定条件，返回值为Boolean , 该方法是只要数组中有一项满足条件就返回true，否则false

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let list = [1, 2, 3];
 
let res = list.some(item => item > 0)
console.log(res) // true

  reduce 用途： 该方法接收一个函数作为累加器，数组中的每个值（从左到右）开始缩减，最终计算为一个值。该方法回调函数接收四个参数 第一个参数：初始值, 或者计算结束后的返回值 第二个参数：当前元素 第二个参数：当前元素的索引 第四个参数：当前元素所属的数组对象，本身 我们一般只用前两个就行，reduce第一个参数回调函数，第二个参数是初始值

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let list = [1, 2, 3];
 
let res = list.reduce(( prev, cur ) => prev += cur, 0)
console.log(res) // 6

  reverse 用途： 用于数组反转

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let list = [1, 2, 3];
 
let res = list.reverse();
console.log(res) // [3, 2, 1]

  join 用途： 用于数据以什么形式拼接

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let list = [1, 2, 3];
 
let res = list.join("-");
console.log(res) // 1-2-3
 
let sum = eval(list.join("+"))
console.log(sum) // 6

  sort 用途： 用于将数组排序，排序规则看返回值 返回值为正数,后面的数在前面 返回值为负数,前面的数不变,还在前面 返回值为0,都不动

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let list = [1, 2, 3];
 
let sort = list.sort((a, b) => b - a)
console.log(sort) // [3, 2, 1]

  concat 用途： 用于合并数组原始

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let list = [1, 2, 3];
 
let res = list.concat([1, 2, 3])
console.log(res) // [1, 2, 3, 1, 2, 3]

  push 用途： 向数组后面添加元素，返回值为数组的length

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let list = [1, 2, 3];
 
let res = list.push(1)
console.log(res) // 4

  pop 用途： 用于删除数组尾部的元素，返回值为删除的元素

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let list = [1, 2, 3];
 
let res = list.pop()
console.log(res) // 3

  shift 用途： 用于删除数组的头部，返回值为删除的元素

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let list = [1, 2, 3];
 
let res = list.shift()
console.log(res) // 1

  unshift 用途： 向数组的头部添加元素，返回值为数组的length

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let list = [1, 2, 3];
 
let res = list.unshift(1)
console.log(res) // 4

  toString 用途： 用于将数组内容转换为字符串 […]

龙生   14 Sep 2021
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