1、实现源码
<!DOCTYPE html>
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<html>
<head>
<title>JavaScript获取某年某月的最后一天</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width">
<script type="text/javascript">
/**
* 获取某年某月的最后一天
*/
function getLastDayOfMonth(year,month)
{
//获取本年本月的第一天日期
var date = new Date(year,month-1,'01');
//设置日期
date.setDate(1);
//设置月份
date.setMonth(date.getMonth() + 1);
//获取本月的最后一天
cdate = new Date(date.getTime() - 1000*60*60*24);
//打印某年某月的最后一天
alert(cdate.getFullYear()+"年"+(Number(cdate.getMonth())+1)+"月最后一天的日期:"+cdate.getDate()+"日");
//返回结果
return cdate.getDate();
}
</script>
</head>
<body>
<input type="button" value="获取某年某月的最后一天" onclick="getLastDayOfMonth(2014,6)"/>
</body>
</html>
2、实现结果