基于Webpack多入口配置与HTML后处理的换肤方案

Webpack多入口配置

config.entry={
 app: ['./src/app.js'],
 defaultTheme: ['./src/theme.default.color.js'],
 orangeTheme:['./src/theme.orange.color.js'],
 blueTheme:['./src/theme.blue.color.js'],
}

 import "./app.styl" //整个项目的样式，在各种皮肤下都保持不变的那部分
theme.blue.color.js 蓝色皮肤js文件
import "./theme/blue.styl"

@require "./css/skinTheme/var.blue" //样式变量，整体为蓝色风格的颜色值
@require "./css/skinTheme/theme.color" //提取出来的需要换肤的那部分样式如代码所示，几个主题js文件中只是单纯的

HTML后处理与路径提取

<html>
 <head>
  <link rel="stylesheet" href="app.xxxx.css" rel="external nofollow" rel="external nofollow" >
  <link rel="stylesheet" href="defaultTheme.xxxxx.css" rel="external nofollow" >
  <link rel="stylesheet" href="orangeTheme.xxxxx.css" rel="external nofollow" >
  <link rel="stylesheet" href="blueTheme.xxxxx.css" rel="external nofollow" >
 </head>
 <body>
  <script src="app.xxxx.js"></script>
  <script src="defaultTheme.xxxx.js"></script>
  <script src="orangeTheme.xxxx.js"></script>
  <script src="blueTheme.xxxx.js"></script>
 </body>

/build/index.html
<html>
 <head>
  <script>
   window.cssUrls={
    "defaultTheme":"/defaultTheme.4bdb738cdc062e7842ce.css",
    "orangeTheme":"/orangeTheme.4bdb738cdc062e7842ce.css","blueTheme":"/blueTheme.4bdb738cdc062e7842ce.css"
   }
  </script>
  <link rel="stylesheet" href="app.xxxx.css" rel="external nofollow" rel="external nofollow" >
 </head>
 <body>
  <script src="app.xxxx.js"></script>
 </body>
</html>可以写这样一个操作文件的函数
cssExtract.js
const DISTPATH = 'build/index.html'
const cheerio = require('cheerio')
const fs = require('fs')
const chalk = require('chalk')
const prefix = ['defaultTheme', 'orangeTheme', 'blueTheme']
const cssUrls = {}
function extractCss() {
 fs.readFile(DISTPATH, 'utf8', (err, data) => {
  if (err) {
   throw err
  }
  const $ = cheerio.load(data)
  /**
   * 删除所有主题css，相关链接保存在window.cssUrls中
   */
  $('link').each((index, item) => {
   const href = $(item).attr('href')
   for (const val of prefix) {
    if (href.indexOf(val) !== -1) {
     cssUrls[val] = href
     $(item).remove()
    }
   }
  })
  /**
   * 删除无用的js
   */
  $('script').each((index, item) => {
   const src = $(item).attr('src')
   for (const val of prefix) {
    if (src && src.indexOf(val) !== -1) {
     $(item).remove()
    }
   }
  })
  //插入行内js
  $('base').after(`<script>window.cssUrls=${JSON.stringify(cssUrls)}</script>`)
  fs.writeFile(DISTPATH, $.html(), err => {
   if (err) {
    throw err
   }
   console.log(chalk.cyan('extract css url complete.\n'))
  })
 })
}