前端兩三問

一、js 獲取當前日期星期幾

getWeek(time) {
    let weekDay = ["週日","週一", "週二", "週三", "週四", "週五", "週六"];    
    let myDate = new Date(Date.parse(time));  
    return weekDay[myDate.getDay()]
},

console.log(getWeek('2019-09-11')   // 週三

二、iveiw 時間限制今天以前不可選

<Date-picker 
  type="date" 
  :options="pickerOptionsStart" 
></Date-picker>

pickerOptionsStart: {
  disabledDate (time) {
    return time.getTime() < new Date(new Date().toLocaleDateString()).getTime();
  }
}

三、js 計算某個時間 前 15天 後15天

function GetDateStr(AddDayCount, date, type) { 
		var dd = new Date(date);
		dd.setDate(dd.getDate()+AddDayCount);
		var y = dd.getFullYear(); 
		var m = (dd.getMonth()+1)<10?"0"+(dd.getMonth()+1):(dd.getMonth()+1);
		var d = dd.getDate()<10?"0"+dd.getDate():dd.getDate();
		if(type){
			if(date === this.oldTime) {
				return '今天'
			} else {
				return d
			}
		} else {
			return y + "-" + m + "-" + d; 
		}
}

GetDateStr(-14, '2019-09-12')  //  2019-08-29 
GetDateStr(14, '2019-09-12')  //  2019-09-26