在vant中使用时间选择器和popup弹出层的操作

<template> 
 <div class="page">
  <van-cell-group>
      <van-cell
       title="选择日期"
       :value="datetime"
       arrow
       @click="showDatePicker = !showDatePicker"
      ></van-cell>
 </van-cell-group>
 <van-popup v-model="showDatePicker" position="bottom" :style="{ height: '40%' }">
   <van-datetime-picker
    v-model="currentDate"
    @confirm="
     showDatePicker = false;
     onchangDate1();
    "
    @cancel="showDatePicker = false"
    title="时间选择"
    type="date"
   />
  </van-popup>
 </div>
<template>
<script>
  import { Cell, CellGroup, DatetimePicker, Popup } from "vant";
  import Vue from "vue";
  export default {
   //组件 Q2组件需要正确注册，才能被页面识别
   components: {
     [Cell.name]: Cell,
     [CellGroup.name]: CellGroup,
     [DatetimePicker.name]: DatetimePicker,
     [Popup.name]: Popup
   },
 //数据层
 data() {
  return {
   datetime: "",
   currentDate: "",  //初始化当前时间
   showDatePicker: false, //判断popup弹出层是否显示，false不显示
  }；
 },
 created() {
  this.currentDate = new Date();  //给当前时间赋值
  this.datetime = this.common.dateToString(this.currentDate);  //给单元格显示当前时间的变量赋值
 },
 mounted() {},
 methods: {
  onchangDate1() {
   //currentDate值就是选择的时间，把改变后的值赋值给单元格变量显示
   this.datetime = this.common.dateToString(this.currentDate);  
  }
 }
};
</script>