js jq 字符串转日期并比较大小

$(function(){
	
	//alert(compareDate("2011-4-1","2011-2-22"));

	alert(compareDate2("31/10/2011","30/11/2011"));

});

//判断 日/月/年，大小
function compareDate2(DateOne,DateTwo)
{ 
	var str="/";
	
	var OneDay = DateOne.substring(0,DateOne.indexOf (str));
	var OneMonth = DateOne.substring(DateOne.indexOf (str) + 1,DateOne.lastIndexOf (str));
	var OneYear  = DateOne.substring(DateOne.lastIndexOf (str)+1,DateOne.length);
		
	var TwoDay = DateTwo.substring(0,DateTwo.indexOf (str));
	var TwoMonth = DateTwo.substring(DateTwo.indexOf (str) + 1,DateTwo.lastIndexOf (str));
	var TwoYear = DateTwo.substring(DateTwo.lastIndexOf (str)+1,DateTwo.length);

	if (Date.parse(OneMonth+"/"+OneDay+"/"+OneYear) >
		Date.parse(TwoMonth+"/"+TwoDay+"/"+TwoYear))
	{
		return true;
	}
	else
	{
		return false;
	}

}
//判断 年-月-日，大小
function compareDate(DateOne,DateTwo)
{ 
	var str="-";

	var OneMonth = DateOne.substring(5,DateOne.lastIndexOf (str));
	var OneDay = DateOne.substring(DateOne.length,DateOne.lastIndexOf (str)+1);
	var OneYear = DateOne.substring(0,DateOne.indexOf (str));

	var TwoMonth = DateTwo.substring(5,DateTwo.lastIndexOf (str));
	var TwoDay = DateTwo.substring(DateTwo.length,DateTwo.lastIndexOf (str)+1);
	var TwoYear = DateTwo.substring(0,DateTwo.indexOf (str));

	if (Date.parse(OneMonth+"/"+OneDay+"/"+OneYear) >
		Date.parse(TwoMonth+"/"+TwoDay+"/"+TwoYear))
	{
		return true;
	}
	else
	{
		return false;
	}

}