计算两个日期差值（js字符串日期类型）

//两个时间的天数差(DateOne 较小的时间, DateTwo 较大的时间，日期类型：2016-06-16)
function daysBetween(DateOne, DateTwo){ 
	var OneMonth = DateOne.substring(5,DateOne.lastIndexOf ('-'));  
	var OneDay = DateOne.substring(DateOne.length,DateOne.lastIndexOf ('-')+1);  
	var OneYear = DateOne.substring(0,DateOne.indexOf ('-'));  
  
	var TwoMonth = DateTwo.substring(5,DateTwo.lastIndexOf ('-'));  
	var TwoDay = DateTwo.substring(DateTwo.length,DateTwo.lastIndexOf ('-')+1);  
	var TwoYear = DateTwo.substring(0,DateTwo.indexOf ('-'));  
  
	var cha = (Date.parse(TwoMonth+'/'+TwoDay+'/'+TwoYear) - Date.parse(OneMonth+'/'+OneDay+'/'+OneYear))/(24*60*60*1000);   
	return cha;
	//return Math.abs(cha); //返回差值绝对值
}