项目中安装插件

npm i element-theme -D
npm i element-theme-chalk -D
"element-theme": "^2.0.1",
"element-theme-chalk": "^2.15.6",

通过 node_modules/.bin/et 访问到命令。执行 -i 初始化变量文件。默认输出到 element-variables.scss，当然你可以传参数指定文件输出目录。

node_modules/.bin/et -i

生成 element-variables.scss 文件

如果此时出现报错信息：primordials is not defined 解决方案：使用的node版本更换为11.15.0

修改变量

直接编辑 element-variables.scss 文件，例如修改主题色为红色。

$--color-primary: #d0021b !default;

编译主题

执行主题编译命令生成主题，根目录会生成一个theme的文件夹。

node_modules/.bin/et

引入自定义主题

把生成的主题按颜色改名放置 src/theme 目录下。
在 main.js 中import ‘所在路径/index.css’

import Element from 'element-ui';
// import 'element-ui/lib/theme-chalk/index.css'; // 默认的样式
import "@/theme/index.css" // 自定义主题样式

👉动态换肤器方式

添加换肤组件

index.vue

<template>
  <div class="ThemePick">
    <el-color-picker class="theme-picker" popper-class="theme-picker-dropdown" v-model="theme" :size="size">
    </el-color-picker>
  </div>
</template>
<script>
const version = require('element-ui/package.json').version // element-ui version from node_modules
const ORIGINAL_THEME = '#409EFF' // default color
export default {
  name: 'ThemePick',
  props: {
    defaultTheme: {
      type: String,
      default: null
    },
    size: {
      type: String,
      default: 'small'
    }
  },
  components: {},
  data() {
    return {
      chalk: '', // content of theme-chalk css
      theme: ORIGINAL_THEME,
      showSuccess: true // 是否弹出换肤成功消息
    }
  },
  computed: {},
  watch: {
    theme(val, oldVal) {
      console.log("theme = ", val, oldVal);
      if (typeof val !== 'string') return
      const themeCluster = this.getThemeCluster(val.replace('#', ''))
      const originalCluster = this.getThemeCluster(oldVal.replace('#', ''))
      console.log(themeCluster, originalCluster)
      const getHandler = (variable, id) => {
        return () => {
          const originalCluster = this.getThemeCluster(ORIGINAL_THEME.replace('#', ''))
          const newStyle = this.updateStyle(this[variable], originalCluster, themeCluster)
          let styleTag = document.getElementById(id)
          if (!styleTag) {
            styleTag = document.createElement('style')
            styleTag.setAttribute('id', id)
            document.head.appendChild(styleTag)
          }
          styleTag.innerText = newStyle
        }
      }
      const chalkHandler = getHandler('chalk', 'chalk-style')
      if (!this.chalk) {
        const url = `https://unpkg.com/element-ui@${version}/lib/theme-chalk/index.css`
        this.getCSSString(url, chalkHandler, 'chalk')
      } else {
        chalkHandler()
      }
      const styles = [].slice.call(document.querySelectorAll('style'))
        .filter(style => {
          const text = style.innerText
          return new RegExp(oldVal, 'i').test(text) && !/Chalk Variables/.test(text)
        })
      styles.forEach(style => {
        const { innerText } = style
        if (typeof innerText !== 'string') return
        style.innerText = this.updateStyle(innerText, originalCluster, themeCluster)
      })
      // 响应外部操作
      this.$emit('onThemeChange', val)
      if (this.showSuccess) {
        this.$message({
          message: '换肤成功',
          type: 'success'
        })
      } else {
        this.showSuccess = true
      }
    }
  },
  created() { },
  mounted() {
    if (this.defaultTheme != null) {
      this.theme = this.defaultTheme
      this.$emit('onThemeChange', this.theme)
      this.showSuccess = false
    }
  },
  methods: {
    updateStyle(style, oldCluster, newCluster) {
      let newStyle = style
      oldCluster.forEach((color, index) => {
        newStyle = newStyle.replace(new RegExp(color, 'ig'), newCluster[index])
      })
      return newStyle
    },
    getCSSString(url, callback, variable) {
      const xhr = new XMLHttpRequest()
      xhr.onreadystatechange = () => {
        if (xhr.readyState === 4 && xhr.status === 200) {
          this[variable] = xhr.responseText.replace(/@font-face{[^}]+}/, '')
          callback()
        }
      }
      xhr.open('GET', url)
      xhr.send()
    },
    getThemeCluster(theme) {
      const tintColor = (color, tint) => {
        let red = parseInt(color.slice(0, 2), 16)
        let green = parseInt(color.slice(2, 4), 16)
        let blue = parseInt(color.slice(4, 6), 16)
        if (tint === 0) { // when primary color is in its rgb space
          return [red, green, blue].join(',')
        } else {
          red += Math.round(tint * (255 - red))
          green += Math.round(tint * (255 - green))
          blue += Math.round(tint * (255 - blue))
          red = red.toString(16)
          green = green.toString(16)
          blue = blue.toString(16)
          return `#${red}${green}${blue}`
        }
      }
      const shadeColor = (color, shade) => {
        let red = parseInt(color.slice(0, 2), 16)
        let green = parseInt(color.slice(2, 4), 16)
        let blue = parseInt(color.slice(4, 6), 16)
        red = Math.round((1 - shade) * red)
        green = Math.round((1 - shade) * green)
        blue = Math.round((1 - shade) * blue)
        red = red.toString(16)
        green = green.toString(16)
        blue = blue.toString(16)
        return `#${red}${green}${blue}`
      }
      const clusters = [theme]
      for (let i = 0; i <= 9; i++) {
        clusters.push(tintColor(theme, Number((i / 10).toFixed(2))))
      }
      clusters.push(shadeColor(theme, 0.1))
      return clusters
    }
  },
  updated() { },
  beforeDestroy() { },
}
</script>
<style lang='less' rel='stylesheet/less' scoped>
@import "./index.less";
</style>

index.less

.ThemePick {
  .theme-picker {
    .el-color-picker__trigger {
      vertical-align: middle;
    }
  }
  .theme-picker-dropdown {
    .el-color-dropdown__link-btn {
      display: none;
    }
  }
}

在组件中引用

<theme-pick @onThemeChange="onThemeChange"></theme-pick>

偏前端开发实用技能

element-ui 2.15.6 自定义主题（换肤）