自定义主题
1.安装「主题生成工具」
由于主题工具需要依赖于 node-sass,而node-sass版本兼容性并不好，对应 node 版本可能不兼容直接执行npm i element-theme -g所安装的版本，因此需要自行先安装对应 node 版本的node-sass.
对应版本如下
| NodeJS | Minimum node-sass version | Node Module |
|---|---|---|
| Node 14 | 4.14+ | 83 |
| Node 13 | 4.13+ | 79 |
| Node 12 | 4.12+ | 72 |
| Node 11 | 4.10+ | 67 |
| Node 10 | 4.9+ | 64 |
| Node 8 | 4.5.3+ | 57 |
因为我这里的 node 版本是 12.18.1
# 先安装node-sass
set SASS_BINARY_SITE=https://npm.taobao.org/mirrors/node-sass/
npm install node-sass@4.12.0 --save
npm i element-theme -g
特别说明： 若出现 gyp verb check python checking for Python executable "python" in the PATH 错误时。可执行，出现 all done 就算安装完成。
npm install -g node-gyp
npm install --global --production windows-build-tools
2.安装白垩主题
可以从 npm 安装或者从 GitHub 拉取最新代码。
# 从 npm
npm i element-theme-chalk -D
# 从 GitHub
npm i https://github.com/ElementUI/theme-chalk -D
3.新建颜色挑选组件
注意:ORIGINAL_THEME 值不能改变，否则默认按钮颜色不会改变。
代码如下：
<template>
<el-tooltip effect="dark" content="换肤" placement="bottom">
<el-color-picker class="theme-picker" popper-class="theme-picker-dropdown" v-model="theme" :size="size"> </el-color-picker>
</el-tooltip>
</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: 'ThemePicker',
props: {
default: {
// 初始化主题，可由外部传入
type: String,
default: null,
},
size: {
// 初始化主题，可由外部传入
type: String,
default: 'small',
},
},
data() {
return {
chalk: '', // content of theme-chalk css
theme: ORIGINAL_THEME,
showSuccess: true, // 是否弹出换肤成功消息
}
},
mounted() {
if (this.default != null) {
this.theme = this.default
this.$emit('onThemeChange', this.theme)
this.showSuccess = false
}
},
watch: {
theme(val, oldVal) {
if (typeof val !== 'string') return
const themeCluster = this.getThemeCluster(val.replace('#', ''))
const originalCluster = this.getThemeCluster(oldVal.replace('#', ''))
const getHandler = (variable, id) => {
return () => {
const originalCluster = this.getThemeCluster(ORIGINAL_THEME.replace('#', ''))
const newStyle = this.updateStyle(this[variable], originalCluster, themeCluster)
let styleTag = document.getElementById(id)
if (!styleTag) {
styleTag = document.createElement('style')
styleTag.setAttribute('id', id)
document.head.appendChild(styleTag)
}
styleTag.innerText = newStyle
}
}
const chalkHandler = getHandler('chalk', 'chalk-style')
if (!this.chalk) {
const url = `https://unpkg.com/element-ui@${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
}
},
},
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
},
},
}
</script>
<style>
.theme-picker .el-color-picker__trigger {
vertical-align: middle;
}
.theme-picker-dropdown .el-color-dropdown__link-btn {
display: none;
}
</style>
然后在 vuex 对应 vue 模块中，添加颜色管理的状态值。
在 头部添加 颜色选择的组件，供全局选择，代码如下：
import ThemePicker from '@/components/ThemePicker'
//引入组件
components: { ThemePicker },
//使用
<theme-picker
:default="themeColor"
@onThemeChange="onThemeChange">
</theme-picker>
methods: {
// 切换主题方法
onThemeChange (themeColor)
{
this.$store.commit("setThemeColor", themeColor);
}
} //将颜色用状态管理器管理。
在每次颜色改变时，设置到 state.themeColor 上，在各个需要改变皮肤的地方，从 state 中取出来，然后赋值进去。
原文地址：http://book.levy.net.cn/doc/frontend/uiframe/custom_theme.html