得到某个月份的天数(JS版)

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XX http://www.cnblogs.com/goodspeed XX
XX /archive/2004/08/12/32551.html XX
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//方法一
function DayNumOfMonth(Year,Month)
{
var d = new Date(Year,Month,0);
return d.getDate();
}
//方法二
function DayNumOfMonth(Year,Month)
{
Month--;
var d = new Date(Year,Month,1);
d.setDate(d.getDate()+32-d.getDate());
return (32-d.getDate());
}
//方法三
function DayNumOfMonth(Year,Month)
{
return 32-new Data(year,month,32).getData();
}