element中datepicker日期选择器选择周一到周日并实现上一周和下一周的方法

<el-date-picker
    v-model="weeklyDate"
    type="week"
    @change="newDateWeekHandle"
    placeholder="选择周" style="width: 230px">
</el-date-picker>

<el-date-picker
    v-model="weeklyDate"
    type="week"
    :picker-options="{'firstDayOfWeek': 1}"
    @change="newDateWeekHandle"
    placeholder="选择周" style="width: 230px">
</el-date-picker>

<el-date-picker
    :format="startDate + ' 至 ' + endDate"
    v-model="weeklyDate"
    type="week"
    :picker-options="{'firstDayOfWeek': 1}"
    @change="newDateWeekHandle"
    placeholder="选择周" style="width: 230px">
</el-date-picker>

newDateWeekHandle(){
      const now = new Date(this.weeklyDate);
      const nowTime = now.getTime();
      const day = now.getDay();
      const oneDayTime = 24*60*60*1000;
      const mondayTime = nowTime - (day-1)*oneDayTime;
      const sundayTime = nowTime + (7-day)*oneDayTime;
      this.startDate = this.$moment(mondayTime).format('YYYY-MM-DD');
      this.endDate = this.$moment(sundayTime).format('YYYY-MM-DD');
},

npm install moment --save

import moment from 'moment'
Vue.prototype.$moment = moment

    getDateWeek(){
      const now = new Date();
      const nowTime = now.getTime();
      const day = now.getDay();
      const oneDayTime = 24*60*60*1000;
      const mondayTime = nowTime - (day-2)*oneDayTime;//默认是周二
      this.weeklyDate = new Date(mondayTime);
      this.newDateWeekHandle();
    },

    handleLast(){
      const last = new Date(this.weeklyDate);
      last.setDate(last.getDate()-7);//日期相加减
      this.weeklyDate = last;
      this.newDateWeekHandle();
    },
    handleNext(){
      const next = new Date(this.weeklyDate);
      next.setDate(next.getDate()+7);
      this.weeklyDate = next;
      this.newDateWeekHandle();
    },