page

 <el-form-item>
          <el-date-picker
            :size="size"
            v-model="dataTime"
            value-format="yyyy-MM-dd HH:mm:ss"
            type="datetimerange"
            @change="handleChangeDate"
            range-separator="~"
            start-placeholder="订单开始时间"
            end-placeholder="订单结束时间"
          >
          </el-date-picker>
   </el-form-item>

js

 data () {
  dataTime: '',
   filters: {  //查询条件
        orderTimeStart: '',
        orderTimeEnd: '',
      },
}

    // 默认 当日
    getTestTime () {
      let isDate = new Date()
      let sTime = `${isDate.getFullYear()}-${isDate.getMonth() + 1}-${isDate.getDate()}`
      let eTime = `${isDate.getFullYear()}-${isDate.getMonth() + 1}-${isDate.getDate()}`

      sTime = `${sTime} 00:00:00`
      eTime = `${eTime} 23:59:59`
      this.dataTime = [new Date(sTime), new Date(eTime)] // 显示的默认时间
      this.filters.orderTimeStart = sTime  //查询 赋值
      this.filters.orderTimeEnd = eTime
    },
      // 改变时间
    handleChangeDate (e) {
      if (e) {
        this.filters.orderTimeStart = e[0]
        this.filters.orderTimeEnd = e[1]
      } else {
        this.filters.orderTimeStart = ''
        this.filters.orderTimeEnd = ''
      }
    },

  mounted () {
    this.getTestTime()  //先调用默认时间
    this.findPage(null)  //在调页面查询  此方法省略
  }