js比较日期（含时分秒）

  	
  	function compareDate(){
  		var myDate = new Date();
  		var strdt1 = myDate.getFullYear() + '/' + (myDate.getMonth()+1) + '/' + myDate.getDate()
  				   + ' ' + myDate.getHours() + ':' + myDate.getMinutes() + ':' + myDate.getSeconds();

		var strdt2 = '2012/5/2 08:47:00';
  		var dt1=new Date(Date.parse(strdt1));
        var dt2=new Date(Date.parse(strdt2));
        alert(dt1);
        alert(dt2);
        alert(dt1>dt2);
  	}