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Webpack 一，打包JS
source link: http://www.cnblogs.com/buerwei/p/12312593.html
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创建入口文件 app.js
// es6 module 规范
import sum_d from './sum.js'
import {sum_e} from './sum.js'
// commcon js 规范
var minus = require('./minus.js')
console.log('sum_d（4,6）= ', sum_d(4,6))
console.log('sum_e（9,3）= ', sum_e(9,3))
console.log('minus（8,2）= ', minus(8,2))
方法一： es6 module 规范
/* sum.js */
export default function (a, b) {
return a + b
}
// import 导入时要加 {name} name为 export name
export function sum_e (a, b) {
return a + b
}
方法二：commcon js 规范
/* minus.js */
module.exports = function(a, b) {
return a -b
}
执行 Webpack 命令打包 webpack <entry> [<entry>] <output>（ webpack 4+ 后不支持了 ）
webpack app.js bundle.js
呃呃呃额额
打包 ERROR in Entry module not found: Error: Can't resolve 'app.js' in The 'mode' option has not been set ,错误提示
查了一下官方文档才得知，webpack的打包cli命令已经更改： webpack <entry> [<entry>] -o <output>
webpack app.js -o bundle.js
打包成功，得到了 bundle.js啦
使用 node 执行 bundle.js
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