webpack5初始化项目(简单版)

目录

1.初始化生成package.json文件

 2.创建项目目录

3.安装webpack webpack-cli

4.安装html-webpack-plugin 

5.安装webpack-dev-server

6.webpack.config.js配置 

7.运行webpack 

8.浏览器打开 http://localhost:8080/

9.测试代码 


1.初始化生成package.json文件

npm init -y

项目目录:

webpack5_test

   --package.json

 2.创建项目目录

 项目目录:

 webpack5_test

   --src

      --js

        --01.js

      --index.html

      --index.js

   --package.json

   --readme.md

   --webpack.config.js

3.安装webpack webpack-cli

 npm install webpack webpack-cli -S

 项目目录:

 webpack5_test

   --node_modules

   --src

      --js

        --01.js

      --index.html

      --index.js

   --package-lock.json

   --package.json

   --readme.md

   --webpack.config.js

4.安装html-webpack-plugin 

  npm install html-webpack-plugin -S 

5.安装webpack-dev-server

  npm install webpack-dev-server -S 

   在package.json文件配置

   "scripts": {

    "test": "echo \"Error: no test specified\" && exit 1",

    "serve":"webpack-dev-server --open"

  },

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6.webpack.config.js配置 

注意:

webpack5 热更新html 

devServer:{

  watchFiles:['./src/index.html']

}

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const HtmlWebpackPlugin=require('html-webpack-plugin')
module.exports={
    entry:{
        index:'./src/index.js'
    },
    output:{
        path:__dirname+'/public',
        filename:'./js/[name].[hash:8].bundle.js',
        clean:true
    },
    mode:"development",
    plugins:[
        new HtmlWebpackPlugin({
            template:'./src/index.html',
            filename:'./index.html',
            inject:"body"
        })
    ],
    module:{

    },
    devServer:{
        open:true,
        hot:true,
        watchFiles:['./src/index.html']
    }
}

7.运行webpack 

webpack

项目目录:

 webpack5_test

   --node_modules

   --public

     --js

        --index.aa07bef6.bundle.js

     --index.html

   --src

      --js

        --01.js

        --02.js

        --proxy.js

      --index.html

      --index.js

   --package-lock.json

   --package.json

   --readme.md

   --webpack.config.js

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8.浏览器打开 http://localhost:8080/

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9.测试代码 

index.html




    
    
    
    Document


    测试

index.js

import './js/01'
import './js/02'
import './js/proxy'

01.js

{
    let arr=[1,5,6,3,55,22,6,4,3,5,6,3,22,88,3,3]
    let set=new Set(arr)
    let newarr=Array.from(set)//[...set]
    let sortarr=newarr.sort((a, b) => a-b)
    console.log("数组去重、排序:",sortarr)
   //运行结果:(8) [1, 3, 4, 5, 6, 22, 55, 88]
}
{
    let arr=[1,5,6,3,55,22,6,4,3,5,6,3,22,88,3,3]
    let item=arr.find(ele=>ele<99)
    console.log(`item:`, item);
    //item: 1
    let arrfilter=arr.filter(ele=>ele<99)
    console.log(`arrfilter:`, arrfilter);
    //arrfilter: (16) [1, 5, 6, 3, 55, 22, 6, 4, 3, 5, 6, 3, 22, 88, 3, 3]
}

02.js

{
    let map = new Map([["name", "vlodya"], ["sex", "男"]])
    console.log("map:", map);
    //map: Map(2) {'name' => 'vlodya', 'sex' => '男'}
    let obj = Object.fromEntries([["name", "vlodya"], ["sex", "男"]])
    console.log("obj:", obj);
    //obj: {name: 'vlodya', sex: '男'}
    for (let [k, v] of map.entries()) {
        console.log([k, v]);
    }
    //(2) ['name', 'vlodya']
    // (2) ['sex', '男']
}
{
    let obj = {
        name: "vlo",
        age: "16",
        sex: "men"
    }
    for (let [k, v] of Object.entries(obj)) {
        console.log([k, v]);
    }
    //(2) ['name', 'vlo']
    //(2) ['age', '16']
    //(2) ['sex', 'men']
    console.log(`Reflect.get(obj,"name"):`, Reflect.get(obj, "name"));
    //Reflect.get(obj,"name"): vlo
}
{
    let obj = {
        name: "vlo",
        age: "16",
        sex: "men"
    }
    console.log(`Reflect.set(obj,"vip",true):`, Reflect.set(obj, "vip", true));
    //Reflect.set(obj,"vip",true): true
    console.log(`obj:`, obj);
    //obj: {name: 'vlo', age: '16', sex: 'men', vip: true}
    console.log(`Reflect.has(obj,"age")`, Reflect.has(obj, "age"));
    // Reflect.has(obj,"age") true
    console.log(`Reflect.deleteProperty(obj,"sex")`, Reflect.deleteProperty(obj, "sex"), obj);
    //Reflect.deleteProperty(obj,"sex") true {name: 'vlo', age: '16', vip: true}
}
{
    let URL = "http://www.baidu.com?name=Jack&age=25&sex=men&wife=Lucy"
    function getUrlParams2(url) {
        let urlStr = url.split('?')[1]
        const urlSearchParams = new URLSearchParams(urlStr)
        const result = Object.fromEntries(urlSearchParams.entries())
        return result
    }
    console.log(getUrlParams2(URL))
    //{name: 'Jack', age: '25', sex: 'men', wife: 'Lucy'}
}

 proxy.js

{
    let obj = {
        name: "办公用品",
        time: "2023-03-01",
        prich: 66,
        color: "red",
        info: "注意:这是隐私信息,不能获取,修改和删除!"
    }
    let thing = new Proxy(obj, {
        get(target, key) {
            if (key == "info") {
                return false
            } else {
                return target[key]
            }
        },
        set(target, key, value) {
            if (key == "info") {
                return false
            } else {
                return target[key] = value
            }
        },
        deleteProperty(target, key) {
            if (key == "info") {
                return false
            } else {
                //return delete target[key]
                return Reflect.deleteProperty(target,key)
            }
        }
    })
    console.log(`Reflect.get(thing,"name")`, Reflect.get(thing,"name"));
    //Reflect.get(thing,"name") 办公用品
    console.log(`Reflect.get(thing,"info")`, Reflect.get(thing,"info"));
    //Reflect.get(thing,"info") false
    Reflect.set(thing,"name","笔记本电脑")
    Reflect.set(thing,"info","笔记本电脑的Mac信息")
    console.log(`Reflect.set(thing,"info","笔记本电脑的Mac信息")`, Reflect.set(thing,"info","笔记本电脑的Mac信息"));
    //Reflect.set(thing,"info","笔记本电脑的Mac信息") false
    console.log(`thing`, thing);
    //thing Proxy {name: '笔记本电脑', time: '2023-03-01', prich: 66, color: 'red', info: '注意:这是隐私信息,不能获取,修改和删除!'}
    Reflect.deleteProperty(thing,"time")
    console.log(`thing`, thing);
    //thing Proxy {name: '笔记本电脑', prich: 66, color: 'red', info: '注意:这是隐私信息,不能获取,修改和删除!'}
    console.log(`Reflect.deleteProperty(thing,"time")`, Reflect.deleteProperty(thing,"time"));
    //Reflect.deleteProperty(thing,"time") true
    console.log(`Reflect.deleteProperty(thing,"info")`, Reflect.deleteProperty(thing,"info"));
    //Reflect.deleteProperty(thing,"info") false
}

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源码地址:https://github.com/1t1824d/webpack5_test

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