1. 新建项目文件夹,并初始化:

npm init -y
(或:npm init --yes)

2. 项目目录下安装webpack:

npm install webpack@3.12.0 -D

 安装完成后,提示升级npm,根据提示命令进行了升级:


To address issues that do not require attention, run:
  npm audit fix

To address all issues (including breaking changes), run:
  npm audit fix --force

Run `npm audit` for details.
npm notice
npm notice New minor version of npm available! 7.19.1 -> 7.24.0
npm notice Changelog: https://github.com/npm/cli/releases/tag/v7.24.0
npm notice Run npm install -g npm@7.24.0 to update!
npm notice

 升级npm:

npm install -g npm@7.24.0

 3. 项目根目录下新建index.html、main.js、App.js文件,书写一个简单的Vue实例,其中main.js为入口文件,App.js为App组件模块文件,将vue.js文件放入项目根目录下。目录结构如下:

index.html文件代码如下:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="app"></div>

    <!-- <script src="./vue.js"></script> -->
    <!-- build.js为webpack打包后的文件 -->
    <script src="./build.js"></script>
</body>
</html>

main.js文件代码如下:

// esModule语法
// 引入vue.js
import Vue from './vue.js'
// 引入组件模块
import App from './App.js'

new Vue({
    el: '#app',
    components: {
        App
    },
    template: `
        <App />
    `
});

App.js文件代码如下:

var app = {
    template:`
        <div>我是一个入口组件</div>
    `
};

// 导出app对象
export default app;

4. webpack打包命令执行:

webpack ./main.js build.js

 报错:

[webpack-cli] It looks like webpack is not installed.
[webpack-cli] Would you like to install 'webpack' package? (That will run 'npm install -D webpack') (Y/n) 

 根据上述提示输入:Y,安装后出现下面的错误:

To address issues that do not require attention, run:
  npm audit fix

To address all issues (including breaking changes), run:
  npm audit fix --force

Run `npm audit` for details.
[webpack-cli] webpack was installed successfully.
[webpack-cli] { Error: Cannot find module 'webpack'
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:636:15)
    at Function.Module._load (internal/modules/cjs/loader.js:562:25)
    at Module.require (internal/modules/cjs/loader.js:692:17)
    at require (C:\Users\Administrator\node_modules\v8-compile-cache\v8-compile-cache.js:159:20)
    at new WebpackCLI (C:\Users\Administrator\node_modules\webpack-cli\lib\webpack-cli.js:12:24)
    at runCLI (C:\Users\Administrator\node_modules\webpack-cli\lib\bootstrap.js:7:21)
    at promptInstallation.then (C:\Users\Administrator\node_modules\webpack-cli\bin\cli.js:35:13)
    at process._tickCallback (internal/process/next_tick.js:68:7) code: 'MODULE_NOT_FOUND' }

 上述问题的原因为:未安装全局webpack。

使用windows图标+R打开DOS命令窗口,输入webpack -v,提示webpack未安装:

C:\Users\Administrator>webpack -v
[webpack-cli] It looks like webpack is not installed.
[webpack-cli] Would you like to install 'webpack' package? (That will run 'npm i
nstall -D webpack') (Y/n) n

 使用下面的cnpm命令安装webpack之后,查看webpack版本得到相应版本号即安装成功。

cnpm install -g webpack@3.12.0

回到项目目录下查看webpack版本也可以得到相应的版本号,再次执行打包命令:webpack ./main.js build.js,build.js成功编译生成。

在浏览器中打开index.html文件,成功渲染Vue组件内容:

5. export其他的导出方式

App.js:

// 声明并导出
export var num1 = 0;

// 先声明再导出
var num2 = 5;
export {num2};

// 导出函数
export function add(x, y) {
    return console.log( x + y);
}

main.js中引用及调用:

import {num1, num2, add} from './App.js'

console.log(num1, num2);
add(2, 7);

终端重新执行:webpack ./main.js build.js

页面输出:

6. package.json中scripts的执行

为scripts添加:"build": "webpack ./main.js ./build.js",

在终端执行:npm run build,同样可以编译文件,得到同样的结果。

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