js的时间比较大小

js对于2011-10-10 00:10:26时间类型格式进行比较：

<script type="text/javascript">
	function compareTo(){
		var beginTime = "2009-09-21 00:00:02";
		var endTime    = "2009-09-21 00:00:01";
		var beginTimes = beginTime.substring(0,10).split('-');
		var endTimes   =  endTime.substring(0,10).split('-');
		
		beginTime = beginTimes[1]+'-'+beginTimes[2]+'-'+beginTimes[0]+' '+beginTime.substring(10,19);
		endTime    = endTimes[1]+'-'+endTimes[2]+'-'+endTimes[0]+' '+endTime.substring(10,19);
		alert(beginTime);
		alert(endTime);
		var a =(Date.parse(endTime)-Date.parse(beginTime))/3600/1000;
		alert(a);
		if(a<0){
			alert("endTime小!");
		}else if (a>0){
			alert("endTime大!");
		}else if (a==0){
			alert("时间相等!");
		}
	 }
</script>

jqeury对于2010/01/20时间类型格式的比较：

<script type="text/javascript">
	$(function()
	{
		$("#btn").click(function()
		{
			var beg=$("#begTime").val();
			var end=$("#endTime").val();
			var date1 = new Date(Date.parse(beg));
    		var date2 = new Date(Date.parse(end));
    		if (date1.getTime() > date2.getTime()) {
    			alert("结束时间不得小于开始时间。");
    			return false;
    		}
		});
	});
</script>