利用js 获取本日 本周 本月时间代码

function showToDay()

{

    var Nowdate=new Date();

    M=Number(Nowdate.getMonth())+1

    alert(Nowdate.getMonth()+"月,"+Nowdate.getDate()+"号,星期"+Nowdate.getDay());

    return Nowdate.getYear()+"-"+M+"-"+Nowdate.getDate();

}

function showTomorrow()

{

    var tom=new Date();

    tom.setDate(tom.getDate()+1);

    M=Number(tom.getMonth())+1

    return tom.getYear()+"-"+M+"-"+tom.getDate();

}

本周第一天

function showWeekFirstDay()

{

    var Nowdate=new Date();

    var WeekFirstDay=new Date(Nowdate-(Nowdate.getDay()-1)*86400000);

    M=Number(WeekFirstDay.getMonth())+1

    return WeekFirstDay.getYear()+"-"+M+"-"+WeekFirstDay.getDate();

}

本周最后天

function showWeekLastDay()

{

    var Nowdate=new Date();

    var WeekFirstDay=new Date(Nowdate-(Nowdate.getDay()-1)*86400000);

    var WeekLastDay=new Date((WeekFirstDay/1000+6*86400)*1000);

    M=Number(WeekLastDay.getMonth())+1

    return WeekLastDay.getYear()+"-"+M+"-"+WeekLastDay.getDate();

}

本月第一天

function showMonthFirstDay()

{

    var Nowdate=new Date();

    var MonthFirstDay=new Date(Nowdate.getYear(),Nowdate.getMonth(),1);

    M=Number(MonthFirstDay.getMonth())+1

    return MonthFirstDay.getYear()+"-"+M+"-"+MonthFirstDay.getDate();

}

本月最后一天

function showMonthLastDay()

{

    var Nowdate=new Date();

    var MonthNextFirstDay=new Date(Nowdate.getYear(),Nowdate.getMonth()+1,1);

    var MonthLastDay=new Date(MonthNextFirstDay-86400000);

    M=Number(MonthLastDay.getMonth())+1

    return MonthLastDay.getYear()+"-"+M+"-"+MonthLastDay.getDate();

}

function getTime(s)

{

    var time1=document.getElementById("num1");

    var time2=document.getElementById("num2");

    if(s==1){

        //本日时间

        time1.value=showToDay();

        //alert("今日:"+time1.value);

        time2.value=showTomorrow();

        //alert("今日:"+time2.value);

    }else if(s==2){

        //本周时间

        time1.value=showWeekFirstDay();

        //alert("本月第一天:"+time1.value);

        time2.value=showWeekLastDay();

        //alert("本月最后一天:"+time2.value);

    }else{

        //本月时间

        time1.value=showMonthFirstDay();

        //alert("本月第一天"+time1.value);

        time2.value=showMonthLastDay();

        //alert("本月最后一天"+time2.value);

    }

}