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