前端两三问

1、js 获取当前日期星期几

getWeek(time) {
    let weekDay = ["周日","周一", "周二", "周三", "周四", "周五", "周六"];    
    let myDate = new Date(Date.parse(time));  
    return weekDay[myDate.getDay()]
},
    
console.log(getWeek('2019-09-11')   // 周三

2、iveiw 时间限制今天之前不可选

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

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

3、js 计算某个时间 前 15天 后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