vue-cli3.0按需引入element-ui组件

1.引入 vue add element

• How do you want to import Element? -->选择   Import on demand （按需导入）
• Choose the locale you want to load–>选择 zh-CN

2.回车后，系统会自动配置引入

• babel.config.js
• main.js
• src\plugins\element.js
• App.vue 自动将el-button作为范例

3.组件按需引入   

    用Button和Message 消息提示为例   src\plugins\element.js 修改如下 

import Vue from 'vue'
import { Button,Message} from 'element-ui'

Vue.use(Button)
Vue.prototype.$message = Message

    message.vue

<template>
  <div class="message">
    <el-button :plain="true" @click="open2">成功</el-button>
    <el-button :plain="true" @click="open3">警告</el-button>
    <el-button :plain="true" @click="open">消息</el-button>
    <el-button :plain="true" @click="open4">错误</el-button>
  </div>

</template>

<script>
  export default {
    methods: {
      open() {
        this.$message('这是一条消息提示');
      },
      open2() {
        this.$message({
          message: '恭喜你，这是一条成功消息',
          type: 'success'
        });
      },

      open3() {
        this.$message({
          message: '警告哦，这是一条警告消息',
          type: 'warning'
        });
      },

      open4() {
        this.$message.error('错了哦，这是一条错误消息');
      }
    }
  }
</script>

4.完整组件列表和引入方式（完整组件列表以 components.json 为准）

import Vue from 'vue'
import {
  Pagination,
  Dialog,
  Autocomplete,
  Dropdown,
  DropdownMenu,
  DropdownItem,
  Menu,
  Submenu,
  MenuItem,
  MenuItemGroup,
  Input,
  InputNumber,
  Radio,
  RadioGroup,
  RadioButton,
  Checkbox,
  CheckboxButton,
  CheckboxGroup,
  Switch,
  Select,
  Option,
  OptionGroup,
  Button,
  ButtonGroup,
  Table,
  TableColumn,
  DatePicker,
  TimeSelect,
  TimePicker,
  Popover,
  Tooltip,
  Breadcrumb,
  BreadcrumbItem,
  Form,
  FormItem,
  Tabs,
  TabPane,
  Tag,
  Tree,
  Alert,
  Slider,
  Icon,
  Row,
  Col,
  Upload,
  Progress,
  Badge,
  Card,
  Rate,
  Steps,
  Step,
  Carousel,
  CarouselItem,
  Collapse,
  CollapseItem,
  Cascader,
  ColorPicker,
  Transfer,
  Container,
  Header,
  Aside,
  Main,
  Footer,
  Loading,
  MessageBox,
  Message,
  Notification
} from 'element-ui'

Vue.use(Pagination)
Vue.use(Dialog)
Vue.use(Autocomplete)
Vue.use(Dropdown)
Vue.use(DropdownMenu)
Vue.use(DropdownItem)
Vue.use(Menu)
Vue.use(Submenu)
Vue.use(MenuItem)
Vue.use(MenuItemGroup)
Vue.use(Input)
Vue.use(InputNumber)
Vue.use(Radio)
Vue.use(RadioGroup)
Vue.use(RadioButton)
Vue.use(Checkbox)
Vue.use(CheckboxButton)
Vue.use(CheckboxGroup)
Vue.use(Switch)
Vue.use(Select)
Vue.use(Option)
Vue.use(OptionGroup)
Vue.use(Button)
Vue.use(ButtonGroup)
Vue.use(Table)
Vue.use(TableColumn)
Vue.use(DatePicker)
Vue.use(TimeSelect)
Vue.use(TimePicker)
Vue.use(Popover)
Vue.use(Tooltip)
Vue.use(Breadcrumb)
Vue.use(BreadcrumbItem)
Vue.use(Form)
Vue.use(FormItem)
Vue.use(Tabs)
Vue.use(TabPane)
Vue.use(Tag)
Vue.use(Tree)
Vue.use(Alert)
Vue.use(Slider)
Vue.use(Icon)
Vue.use(Row)
Vue.use(Col)
Vue.use(Upload)
Vue.use(Progress)
Vue.use(Badge)
Vue.use(Card)
Vue.use(Rate)
Vue.use(Steps)
Vue.use(Step)
Vue.use(Carousel)
Vue.use(CarouselItem)
Vue.use(Collapse)
Vue.use(CollapseItem)
Vue.use(Cascader)
Vue.use(ColorPicker)
Vue.use(Container)
Vue.use(Header)
Vue.use(Aside)
Vue.use(Main)
Vue.use(Footer)

Vue.use(Loading.directive)

Vue.prototype.$loading = Loading.service
Vue.prototype.$msgbox = MessageBox
Vue.prototype.$alert = MessageBox.alert
Vue.prototype.$confirm = MessageBox.confirm
Vue.prototype.$prompt = MessageBox.prompt
Vue.prototype.$notify = Notification
Vue.prototype.$message = Message