element-plus的使用

小朋友，你是不是有很多问号❓❓❓

甲：为什么在vue3.0中不能使用Element UI了？
乙：由于vue3.0在插件install函数的入参从Vue原型（类）改成了app（vue实例），导致element-ui中Vue.prototype.* 这样的代码已经全都失效了。所以element-ui铁定是不兼容了。
甲：那有什么方法能解决吗？
乙：使用Element UI的升级版element-plus

👉 element-plus官方文档入口

1、npm 安装

npm install element-plus --save

2、引入 Element Plus

2.1 完整引入

在 main.js 中写入以下内容：

import { createApp } from 'vue'
import ElementPlus from 'element-plus';
import 'element-plus/lib/theme-chalk/index.css';
import App from './App.vue';

const app = createApp(App)
app.use(ElementPlus)
app.mount('#app')

以上代码便完成了 Element Plus 的引入。需要注意的是，样式文件需要单独引入。

2.2 按需引入

1. 安装 babel-plugin-import:

npm install babel-plugin-import -D

2. 将 babel.config.js 修改为：

module.exports = {
  plugins: [
    [
      "import",
      {
        libraryName: 'element-plus',
        customStyleName: (name) => {
          name = name.slice(3)
          return `element-plus/packages/theme-chalk/src/${name}.scss`;
        },
      },
    ],
  ],
};

3. 创建 src/plugins/elements.js文件

文件内容如下：

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";


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,
]
const plugins = [
    ElInfiniteScroll,
    ElLoading,
    ElMessage,
    ElMessageBox,
    ElNotification,
]
const installElement = (app) => {
    components.forEach((component) => {
        app.component(component.name, component)
    })

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

export {
    installElement
}

4. 在main.js导入

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

// 导入Element
import { installElement } from "./plugins/elements";

const app = createApp(App)
// 调用installElement
installElement(app)

// 使用installElement
createApp(App).use(store).use(router).use(installElement).mount('#app')

5. 页面中使用即可。
6. 此时的大多组件都显示成英文版，引入中文版，如：

import lang from 'element-plus/lib/locale/lang/zh-cn'
import 'dayjs/locale/zh-cn'
import locale from 'element-plus/lib/locale'
locale.use(lang)