Vue3 Element Plus 按需加载

安装按需引入插件 babel-plugin-import 我们可以只引入需要的组件，以便打包时减小体积。

npm install babel-plugin-import -D

项目创建完成、Element-plus 引入完成后，我们来修改代码，把 Element-plus 配置起来

首先修改 babel.config.js 配置文件，改为：

module.exports = {
  plugins: [
    [
      "import",
      {
        libraryName: 'element-plus',
        customStyleName: (name) => {
          return `element-plus/lib/theme-chalk/${name}.css`;
        },
      },
    ],
  ],
};

然后在 src 目录下新增文件夹 utils ，创建 elementPlus.js 文件，此配置文件用于说明 element plus 需要引入那些组件。

以下是组件的完整列表，大家可根据自己的需求增减：

import {
    ElAlert,
    ElAside,
    ElAutocomplete,
    ElAvatar,
    ElBacktop,
    ElBadge,
    ElBreadcrumb,
    ElBreadcrumbItem,
    ElButton,
    ElButtonGroup,
    ElCalendar,
    ElCard,
    ElCarousel,
    ElCarouselItem,
    ElCascader,
    ElCascaderPanel,
    ElCheckbox,
    ElCheckboxButton,
    ElCheckboxGroup,
    ElCol,
    ElCollapse,
    ElCollapseItem,
    ElCollapseTransition,
    ElColorPicker,
    ElContainer,
    ElDatePicker,
    ElDialog,
    ElDivider,
    ElDrawer,
    ElDropdown,
    ElDropdownItem,
    ElDropdownMenu,
    ElFooter,
    ElForm,
    ElFormItem,
    ElHeader,
    ElIcon,
    ElImage,
    ElInput,
    ElInputNumber,
    ElLink,
    ElMain,
    ElMenu,
    ElMenuItem,
    ElMenuItemGroup,
    ElOption,
    ElOptionGroup,
    ElPageHeader,
    ElPagination,
    ElPopconfirm,
    ElPopover,
    ElPopper,
    ElProgress,
    ElRadio,
    ElRadioButton,
    ElRadioGroup,
    ElRate,
    ElRow,
    ElScrollbar,
    ElSelect,
    ElSlider,
    ElStep,
    ElSteps,
    ElSubmenu,
    ElSwitch,
    ElTabPane,
    ElTable,
    ElTableColumn,
    ElTabs,
    ElTag,
    ElTimePicker,
    ElTimeSelect,
    ElTimeline,
    ElTimelineItem,
    ElTooltip,
    ElTransfer,
    ElTree,
    ElUpload,
    ElInfiniteScroll,
    ElLoading,
    ElMessage,
    ElMessageBox,
    ElNotification,
} from 'element-plus';

export const components = [
    ElAlert,
    ElAside,
    ElAutocomplete,
    ElAvatar,
    ElBacktop,
    ElBadge,
    ElBreadcrumb,
    ElBreadcrumbItem,
    ElButton,
    ElButtonGroup,
    ElCalendar,
    ElCard,
    ElCarousel,
    ElCarouselItem,
    ElCascader,
    ElCascaderPanel,
    ElCheckbox,
    ElCheckboxButton,
    ElCheckboxGroup,
    ElCol,
    ElCollapse,
    ElCollapseItem,
    ElCollapseTransition,
    ElColorPicker,
    ElContainer,
    ElDatePicker,
    ElDialog,
    ElDivider,
    ElDrawer,
    ElDropdown,
    ElDropdownItem,
    ElDropdownMenu,
    ElFooter,
    ElForm,
    ElFormItem,
    ElHeader,
    ElIcon,
    ElImage,
    ElInput,
    ElInputNumber,
    ElLink,
    ElMain,
    ElMenu,
    ElMenuItem,
    ElMenuItemGroup,
    ElOption,
    ElOptionGroup,
    ElPageHeader,
    ElPagination,
    ElPopconfirm,
    ElPopover,
    ElPopper,
    ElProgress,
    ElRadio,
    ElRadioButton,
    ElRadioGroup,
    ElRate,
    ElRow,
    ElScrollbar,
    ElSelect,
    ElSlider,
    ElStep,
    ElSteps,
    ElSubmenu,
    ElSwitch,
    ElTabPane,
    ElTable,
    ElTableColumn,
    ElTabs,
    ElTag,
    ElTimePicker,
    ElTimeSelect,
    ElTimeline,
    ElTimelineItem,
    ElTooltip,
    ElTransfer,
    ElTree,
    ElUpload,
]

export const plugins = [
    ElInfiniteScroll,
    ElLoading,
    ElMessage,
    ElMessageBox,
    ElNotification,
]

修改 main.js 文件：

import { createApp } from 'vue'
import App from './App.vue'

import {
    components,
    plugins
} from './utils/elementPlus.js'

const app = createApp(App)
components.forEach(component => {
    app.component(component.name, component)
})

plugins.forEach(plugin => {
    app.use(plugin)
})
app.mount('#app')

最后，修改 components/HelloWorld.vue 文件，我们把主要的元素放在页面上

<template>
  <div class="hello">
    <h1>{{ msg }}</h1>
    <el-row>
  <el-button>默认按钮</el-button>
  <el-button type="primary">主要按钮</el-button>
  <el-button type="success">成功按钮</el-button>
  <el-button type="info">信息按钮</el-button>
  <el-button type="warning">警告按钮</el-button>
  <el-button type="danger">危险按钮</el-button>
</el-row>

<el-row>
  <el-button plain>朴素按钮</el-button>
  <el-button type="primary" plain>主要按钮</el-button>
  <el-button type="success" plain>成功按钮</el-button>
  <el-button type="info" plain>信息按钮</el-button>
  <el-button type="warning" plain>警告按钮</el-button>
  <el-button type="danger" plain>危险按钮</el-button>
</el-row>

<el-row>
  <el-button round>圆角按钮</el-button>
  <el-button type="primary" round>主要按钮</el-button>
  <el-button type="success" round>成功按钮</el-button>
  <el-button type="info" round>信息按钮</el-button>
  <el-button type="warning" round>警告按钮</el-button>
  <el-button type="danger" round>危险按钮</el-button>
</el-row>

<el-row>
  <el-button icon="el-icon-search" circle></el-button>
  <el-button type="primary" icon="el-icon-edit" circle></el-button>
  <el-button type="success" icon="el-icon-check" circle></el-button>
  <el-button type="info" icon="el-icon-message" circle></el-button>
  <el-button type="warning" icon="el-icon-star-off" circle></el-button>
  <el-button type="danger" icon="el-icon-delete" circle></el-button>
</el-row>
  </div>
</template>

<script>
export default {
  name: 'HelloWorld',
  props: {
    msg: String
  }
}
</script>

<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped>
h3 {
  margin: 40px 0 0;
}
ul {
  list-style-type: none;
  padding: 0;
}
li {
  display: inline-block;
  margin: 0 10px;
}
a {
  color: #42b983;
}
</style>