js 计算时间差

 function GetDateDiff(startDate,endDate)  
        {  
            var startTime = new (<any>Date)(Date.parse(startDate.replace(/-/g,"/"))).getTime();     
            var endTime = new (<any>Date)(Date.parse(endDate.replace(/-/g,"/"))).getTime();     
            var days = Math.abs((startTime - endTime))/(1000*60*60*24);     
             return days;
        }

//调用
var days=GetDateDiff("2017-1-2","2017-1-3");