计算两个时间的时间差

function GetDateDiff(startTime, endTime, diffType) {
    //将xxxx-xx-xx的时间格式，转换为 xxxx/xx/xx的格式 
    startTime = startTime.replace(/-/g, "/");
    endTime = endTime.replace(/-/g, "/");
    //将计算间隔类性字符转换为小写
    diffType = diffType.toLowerCase();
    var sTime =new Date(startTime); //开始时间
    var eTime =new Date(endTime); //结束时间
    //作为除数的数字
    var timeType =1;
    switch (diffType) {
        case"second":
            timeType =1000;
        break;
        case"minute":
            timeType =1000*60;
        break;
        case"hour":
            timeType =1000*3600;
        break;
        case"day":
            timeType =1000*3600*24;
        break;
        default:
        break;
    }
    return parseInt((eTime.getTime() - sTime.getTime()) / parseInt(timeType));
}
//计算两个日期之间相差的分钟
    console.log(GetDateDiff("2016-03-28 10:30:22","2016-03-28 10:38:00","minute"));

//转化为毫秒数比价大小就行了
var d_1 = "2014-11-22";
var d_2 = "2014-11-22";
//比较两个日期的先后
console.log(dd(d_1,d_2))
function dd(d_1,d_2){
var e_1 = new Date(d_1).getTime();
var e_2 = new Date(d_2).getTime();
if(e_1>e_2){
return true;
}else{
return false;
}
}