1、创建目录初始化npm，并安装webpack和webpack-cli

mkdir webpack-demo && cd webpack-demo npm init -y npm install webpack webpack-cli --save-dev

2、工程目录更如下

webpack-demo
  |- webpack.config.js // webpack配置文件
  |- package.json
  |- index.html  // 新增html
  |- /src        // 新增src源代码文件夹
    |- index.js  // 新增js文件

3、修改webpack.config.js文件

const path = require('path');

module.exports = {
    entry: './src/index.js',
    output: {
        filename: 'bundle.js',
        path: path.resolve('__dirname', 'dist')
    }
}


4、修改package.json

{
  "name": "webpack-demo",
  "version": "1.0.0",
  "description": "",
   --"main": "index.js", //移除 main 入口。这可以防止意外发布你的代码。
  "private": true, // 确保我们安装包是私有的
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "build": "webpack" // npm run build 运行webpack脚本
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "webpack": "^4.32.0",
    "webpack-cli": "^3.3.2"
  },
  "dependencies": {
    "lodash": "^4.17.11"
  }
}

5、dist路径下放入index.html

<!doctype html>
<html>
<head>
    <title>起步</title>
</head>
<body>
    <script src="bundle.js"></script>
</body>
</html>

6、修改index.js文件

const _ = require('lodash');

function component() {
    var element = document.createElement('div');

    element.innerHTML = _.join(['Hello', 'webpack'], '--');

    return element;
}

document.body.appendChild(component());

7、运行npm run build编译工程，运行dist/index.html文件，显示运行结果


※需要按装lodash

npm install --save lodash