el-date-picker限制联动日期为同一天内

element ui 的el-date-picker，限定开始和结束时间为同一天内，且开始时间限定为当前时间之前

<el-date-picker
      v-model="ip_session.parameter.date"
      type="datetimerange"
      :picker-options="pickerOptions1"
      range-separator="至"
      start-placeholder="开始日期"
      end-placeholder="结束日期"
      @change="selectData"
/>

pickerOptions1: {
        startDate: null,
        disabledDate: time => {
          if (this.pickerOptions1.startDate === undefined || this.pickerOptions1.startDate === null) {
            return time.getTime() > Date.now()
          } else {
            return time.getTime() > this.pickerOptions1.startDate.getTime() + 86399000 || time.getTime() < this.pickerOptions1.startDate.getTime()
          }
        },
        onPick: dateRange => {
          this.pickerOptions1.startDate = dateRange.minDate
          if (dateRange.maxDate) {
            this.pickerOptions1.startDate = null
          }
        }
 }

selectData(e) {
      if (e === null) {
        this.pickerOptions1.startDate = null
      }
}

 效果：