1.安装vuecli脚手架
2.终端输入

cnpm i element-ui -S

安装element-ui
3.按需引入select组件
在main.js中写入如下代码

/* 导入第三方库开始 */
import 'element-ui/lib/theme-chalk/index.css';
// 按需加载Select组件
import {Select,Option,Dialog,Button} from 'element-ui'
Vue.use(Select)
Vue.use(Option)
Vue.use(Dialog)
Vue.use(Button)
// Vue.component(Select.name,Select);
// 或写为Vue.use(Button)
/* 导入第三方库结束 */

HelloWorld.vue代码

<template>
<div>
    <el-dialog
      title="提示"
      :visible.sync="dialogVisible"
      width="30%">
      <span>{{selVal}}</span>
      <span slot="footer" class="dialog-footer">
        <el-button @click="dialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="dialogVisible = false">确 定</el-button>
      </span>
    </el-dialog>

      <el-select v-model="value" multiple placeholder="请选择" @change="currentSel">
        <el-option
          v-for="item in options"
          :key="item.value"
          :label="item.label"
          :value="item.label">
        </el-option>
      </el-select>
</div>
</template>

<script>
  export default {
    data() {
      return {
        options: [{
          value: '选项1',
          label: '黄金糕'
        }, {
          value: '选项2',
          label: '双皮奶'
        }, {
          value: '选项3',
          label: '蚵仔煎'
        }, {
          value: '选项4',
          label: '龙须面'
        }, {
          value: '选项5',
          label: '北京烤鸭'
        }],
        value: '',
        dialogVisible: false,
        selVal : ''
      }
    },
    methods: {
      currentSel(selVal){
        this.selVal = selVal;
        this.dialogVisible = true;
      }
    }
  }
</script>