js獲取最近一週,最近3天日期

// getDay(0);//當天日期   getDay(-7);//7天前日期   getDay(0);//當天日期   getDay(-3);//3天前日期
    getDay(day) {
      var today = new Date();
      var targetday_milliseconds = today.getTime() + 1000 * 60 * 60 * 24 * day;
      today.setTime(targetday_milliseconds); //注意，這行是關鍵代碼
      var tYear = today.getFullYear();
      var tMonth = today.getMonth();
      var tDate = today.getDate();
      tMonth = this.doHandleMonth(tMonth + 1);
      tDate = this.doHandleMonth(tDate);
      return tYear + "-" + tMonth + "-" + tDate;
    },
    doHandleMonth(month) {
      var m = month;
      if (month.toString().length == 1) {
        m = "0" + month;
      }
      return m;
    }

cerated獲取日期後再組裝,首屏加載前一週日期

created(){
  var day7 = this.getDay(-7);
  var day1 = this.getDay(-1);
  this.pickerVal = [day7,day1];
},