详解如何使用webpack打包JS

Usage: webpack-cli [options]
    webpack-cli [options] --entry <entry> --output <output>
    webpack-cli [options] <entries...> --output <output>

// sum.js
export default function sum(a, b) {
  return a + b;
}

// app.js

// es6 module规范
import sum from './sum'

// 调用
console.log('sum(23,24) = ', sum(23, 24));

webpack app.js -o bundle.js

Hash: 7e137d767d2665688484
Version: webpack 4.5.0
Time: 588ms
Built at: 2018-6-20 20:30:06
   Asset    Size Chunks       Chunk Names
0.bundle.js 188 bytes    0 [emitted]
 bundle.js  1.84 KiB    1 [emitted] main
Entrypoint main = bundle.js
  [0] ./app.js + 1 modules 466 bytes {1} [built]
    | ./app.js 411 bytes [built]
    | ./sum.js 55 bytes [built]
  [1] ./minus.js 54 bytes {1} [built]
  [2] ./muti.js 114 bytes {0} [built]