主要原理是利用webpack外掛webpack-theme-color-replacer提取相關顏色css然後根據配置動態生成替換的css

具體實現步驟如下：

1.新增webpack外掛，新建檔案webpack/themePlugin.js

const ThemeColorReplacer = require('webpack-theme-color-replacer')
const forElementUI = require('webpack-theme-color-replacer/forElementUI')
const config = require('../src/config/appConfig')
module.exports = new ThemeColorReplacer({
  fileName: 'css/theme-colors.[contenthash:8].css',matchColors: [
    ...forElementUI.getElementUISeries(config.themeColor),//element-ui主色系列
    // '#0cdd3a',//自定義顏色
  ],changeSelector: forElementUI.changeSelector,isJsUgly: process.env.NODE_ENV !== 'development',// injectCss: false,// resolveCss(resultCss) { // optional. Resolve result css code as you wish.
  //   return resultCss + youCssCode
  // }
})

matchColors陣列中可配置多個自定義要替換的主題色

2.在vue.config.js中新增這個外掛

const themePlugin=require('./webpack/themePlugin');
module.exports = {
 configureWebpack: {
  plugins: [
        themePlugin
       ]
  }
 }

3.新建檔案themeColorClient.js

import client from 'webpack-theme-color-replacer/client'
import forElementUI from 'webpack-theme-color-replacer/forElementUI'
import appConfig from '@/config/appConfig'
export let curColor = appConfig.themeColor

// 動態切換主題色
export function changeThemeColor(newColor) {
  var options = {
    newColors: [...forElementUI.getElementUISeries(newColor)],}
  return client.changer.changeColor(options,Promise)
    .then(() => {
      curColor = newColor
      localStorage.setItem('theme_color',curColor)
    });
}

export function initThemeColor() {
  const savedColor = localStorage.getItem('theme_color')
  if (savedColor) {
    curColor = savedColor
    changeThemeColor(savedColor)
  }
}

4.在需要的時候呼叫 initThemeColor初始化顏色 changeThemeColor改變主題顏色

import { initThemeColor,changeThemeColor } from './utils/themeColorClient'
initThemeColor()
changeThemeColor('#F56C6C')//傳入顏色格式應該為十六進位制顏色值，'red'類似顏色暫不支援

具體細節請參考https://github.com/hzsrc/vue-element-ui-scaffold-webpack4

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