用javascript怎么取到当前月第一天、最后一天，本周第一天、最后一天

Question

<script language=javascript>
function showWeekFirstDay()
{
var Nowdate=new Date();
var WeekFirstDay=new Date(Nowdate-(Nowdate.getDay()-1)*86400000);
alert(WeekFirstDay)
}
function showWeekLastDay()
{
var Nowdate=new Date();
var WeekFirstDay=new Date(Nowdate-(Nowdate.getDay()-1)*86400000);
var WeekLastDay=new Date((WeekFirstDay/1000+6*86400)*1000);
alert(WeekLastDay)
}
function showMonthFirstDay()
{
var Nowdate=new Date();
var MonthFirstDay=new Date(Nowdate.getYear(),Nowdate.getMonth(),1);
alert(MonthFirstDay)
}
function showMonthLastDay()
{
var Nowdate=new Date();
var MonthNextFirstDay=new Date(Nowdate.getYear(),Nowdate.getMonth()+1,1);
var MonthLastDay=new Date(MonthNextFirstDay-86400000);
alert(MonthLastDay)
}
</script>
<input name=haha type=button value="本周第一天" onclick=showWeekFirstDay()>
<input name=haha type=button value="本周第七天" onclick=showWeekLastDay()>
<input name=haha type=button value="本月第一天" onclick=showMonthFirstDay()>
<input name=haha type=button value="本月最后一天" onclick=showMonthLastDay()>

Answer 1

var date = new Date();
用date.getDay()和date.getDate()分别获取今天星期几和月的几号
然后在针对这个月的月份进行判断

Answer 2

hbhbhbhbhb1021(天外水火(我要多努力)) 
怎么把提示的时间转换成本地时间呢？

Answer 3

getYear() 获取:年
getMonth()    月
getDate()     日

Answer 4

加“.getDate()”就转换为本地时间了

Answer 5

<script language=javascript>
function showWeekFirstDay()
{
var Nowdate=new Date();
var WeekFirstDay=new Date(Nowdate-(Nowdate.getDay()-1)*86400000);
alert(WeekFirstDay)
}
function showWeekLastDay()
{
var Nowdate=new Date();
var WeekFirstDay=new Date(Nowdate-(Nowdate.getDay()-1)*86400000);
var WeekLastDay=new Date((WeekFirstDay/1000+6*86400)*1000);
alert(WeekLastDay)
}
function showMonthFirstDay()
{
var Nowdate=new Date();
var MonthFirstDay=new Date(Nowdate.getYear(),Nowdate.getMonth(),1);
alert(MonthFirstDay)
}
function showMonthLastDay()
{
var Nowdate=new Date();
var MonthNextFirstDay=new Date(Nowdate.getYear(),Nowdate.getMonth()+1,1);
var MonthLastDay=new Date(MonthNextFirstDay-86400000);
alert(MonthLastDay)
}
function Date.prototype.toString(){
return this.getFullYear()+"年"+(this.getMonth()+1)+"月"+this.getDate()+"日";
}
</script>
<input name=haha type=button value="本周第一天" onclick=showWeekFirstDay()>
<input name=haha type=button value="本周第七天" onclick=showWeekLastDay()>
<input name=haha type=button value="本月第一天" onclick=showMonthFirstDay()>
<input name=haha type=button value="本月最后一天" onclick=showMonthLastDay()>