从当前日期加减N天后，得到新日期；上一周和下一周切换。

来源：互联网发布：淘宝卖家如何重新发货编辑：程序博客网时间：2024/05/29 10:55
1、函数逻辑function changeToNextDay(startDate:any,dayIn:number){    var date=startDate.split('-'); 分割出年月日    var d=new Date();    d.setFullYear(date[0],date[1]-1,date[2]);    var myDate=new Date(d.getTime()+dayIn*24*60*60*1000);    var year=myDate.getFullYear();    var month=myDate.getMonth()+1;    var day=myDate.getDate();    var CurrentDate=year+'-';    if(month>=10)    {        CurrentDate=CurrentDate+month+"-";    }    else    {        CurrentDate=CurrentDate+"0"+month+"-";    }    if(day>=10)    {        CurrentDate=CurrentDate+day;    }    else    {        CurrentDate=CurrentDate+"0"+day;    }    console.log(CurrentDate,d);    return CurrentDate;}2、函数调用  var startDate="2016-11-12";  var dayIn=-7；changeToNextDay(startDate,dayIn)；程序输出：2016-11-053、根据当前日期切换上一周和下一周//切换到上一周或下一周changeToNextWeek(currentDate:any,changeType:number){    var days=[];    var lastDay;    var firstDay;    var date=currentDate.split('-');    var d=new Date();    d.setFullYear(date[0],date[1]-1,date[2]);    var myDate=new Date(d.getTime());    var year=myDate.getFullYear();    var month=myDate.getMonth()+1;    var day=myDate.getDate();    var weekDay=myDate.getDay();    if(changeType<0){        if(weekDay==0){            firstDay=this.changeToNextDay(currentDate,-13);            lastDay=this.changeToNextDay(currentDate,-7);        }else{            firstDay=this.changeToNextDay(currentDate,-(6+weekDay));            lastDay=this.changeToNextDay(currentDate,-weekDay);        }    }else{        if(weekDay==0){            firstDay=this.changeToNextDay(currentDate,1);            lastDay=this.changeToNextDay(currentDate,7);        }else{            firstDay=this.changeToNextDay(currentDate,8-weekDay);            lastDay=this.changeToNextDay(currentDate,14-weekDay);        }    }    // 当时间为本周时    var curDate=new Date();    var year3=curDate.getFullYear();    var month3=curDate.getMonth()+1;    var day3=curDate.getDate();    days[0]=firstDay;    if(year3==year && month3==month && day3==day){        days[1]=year3+'-'+month3+'-'+day3;    }else{        days[1]=lastDay;    }    return days;}
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