场景：使用iview的日期选择器DatePicker情况下还需要限制时分秒，例如2020.01.14 09:39前的天时分不可选。

在此功能上我查看了iview官方文档，并未有该类限制属性，但实际上通过源码是有这个属性的。

核心属性options和timePickerOptions

核心实现：timePickerOptions下disabledHours和disabledMinutes显示时分

<template>
  <div>
    <DatePicker
              type="datetime"
              :options="sendTimeLimit"
              :timePickerOptions="timePickerOptions"
              clearable
              @on-change="handleSendTime"
            />
  </div>
</template>
<script>
  export default {
    data () {
      return {
        sendTimeLimit:0,
        timePickerOptions: { steps: [1, 1, 60] },
      }
    },
    methods: {
       handleSendTime(val) {
         //重置时分秒的时间限制
       if()//判断选中是否当前当天，否则有之后天数的时分选择都会有bug
      const hours = moment()
        .startOf('hour')
        .valueOf();
      const days = moment()
        .startOf('day')
        .valueOf();
      let hourNum = (hours - days) / 3600000;
      //这里获取小时数可以用此类方法
      //const hourNum = Number(moment().format('H'))
      
      let hourArr = [];
      let hourMax = 0;
      for (let hour = 0; hour < hourNum; hour++) {
        hourArr.push(hour);
        hourMax = hour;
      }
      //此处循环出数组可以用这个方法let 
      //len = 15;
  //let arr = new Array(len).fill(0).map((e, i) => i);
  //console.log(arr);
      this.timePickerOptions.disabledHours = hourArr;
      this.handleSendTimeMin(val, hourMax);
    },

    handleSendTimeMin(val, hourMax) {
      let checkHour = new Date(val).getHours();
      if (checkHour <= hourMax + 1) {
        const hours = moment()
          .startOf('hour')
          .valueOf();
        const mins = moment()
          .startOf('minute')
          .valueOf();
        let minsNum = (mins - hours) / 60000;
        let minArr = [];
        for (let min = 0; min < minsNum; min++) {
          minArr.push(min);
        }
        this.timePickerOptions.disabledMinutes = minArr;
        this.timePickerOptions = JSON.parse(
          JSON.stringify(this.timePickerOptions)
        );
      } else {
        this.timePickerOptions.disabledMinutes = [];
      }
    },
    },
    mounted () {
      this.sendTimeLimit = {
        disabledDate(date) {
          const disabledDay = date.getTime();
          const start = moment()
            .startOf('day')
            .valueOf();
          return disabledDay < start;
        },
      };
    }
  }
</script>