开始结束日期 实现快捷键今天、昨天、本周、本月、本年

<el-date-picker
                v-model="startEndTime"
                type="daterange"
                align="right"
                unlink-panels
                range-separator="至"
                start-placeholder="开始月份"
                end-placeholder="结束月份"
                :picker-options="pickerOptions"
                value-format="yyyy-MM-dd"
                @change="handleChange"
                >
</el-date-picker>

pickerOptions: {
  shortcuts: [
    {
      text: '今天',
      onClick(picker) {
        picker.$emit('pick', [new Date(),new Date()]);
      }
    },
    {
      text: '昨天',
      onClick(picker) {
        const date = new Date();
        const end = new Date();
        date.setTime(date.getTime() - 3600 * 1000 * 24);
        end.setTime(end.getTime() - 3600 * 1000 * 24);
        picker.$emit('pick', [date,end]);
      }
    },
    {
      //本周
      text: '本周',
      onClick(picker) {
        let now = new Date();
        let day = now.getDay();
        console.log('day',day);
        let weeks = new Array(7, 1, 2, 3, 4, 5, 6);
        let week = weeks[day];
        console.log('week',week);
        const start = new Date();
        const end = new Date();
        start.setTime(start.getTime() - 3600 * 1000 * 24 * (week-1));
        picker.$emit('pick', [start, end]);
      }
    },
    {
      text: '本月',
      onClick(picker) {
        let now = new Date();
        let day = now.getDate();

        //const start = new Date(new Date().getMonth()+1,0);
        const start = new Date();
        const end = new Date();
        start.setTime(start.getTime() - 3600 * 1000 * 24 * (day - 1));
        picker.$emit('pick', [start, end]);
      }
    },
    {
      text: '本年',
      onClick(picker) {
        const end = new Date();
        const start = new Date(new Date().getFullYear(), 0);
        console.log('start',start);
        picker.$emit('pick', [start, end]);
      }
    }
  ]
}

优化本周、本月

{
  //本周
  text: '本周',
    onClick(picker) {
    let now = new Date();
    //getDay 从Date对象返回一周中的某一天（0～6）
    let day = now.getDay();
    let num;
    if(day === 0) {
      num = 7;
    }else {
      num = day;
    }
    const start = new Date();
    const end = new Date();
    start.setTime(start.getTime() - 3600 * 1000 * 24 * (num-1));
    picker.$emit('pick', [start, end]);
  }
},
  {
    text: '本月',
      onClick(picker) {
      const end = new Date();
      const start = new Date();
      //setDate() 方法用于设置一个月的某一天。
      start.setDate(1);
      picker.$emit('pick', [start, end]);
    }
  }