vue在线动态切换主题色方案

主要原理是利用webpack插件webpack-theme-color-replacer提取相关颜色css然后根据配置动态生成替换的css

具体实现步骤如下：

1.添加webpack插件，新建文件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', //自定义颜色
  ],
  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数组中可配置多个自定义要替换的主题色

2.在vue.config.js中添加这个插件

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

3.新建文件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

// 动态切换主题色
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.在需要的时候调用 initThemeColor初始化颜色 changeThemeColor改变主题颜色

import { initThemeColor,changeThemeColor } from './utils/themeColorClient'
initThemeColor()
changeThemeColor('#F56C6C')//传入颜色格式应该为十六进制颜色值，'red'类似颜色暂不支持

具体细节请参考https://github.com/hzsrc/vue-element-ui-scaffold-webpack4

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