/**

     *

     * @param startTime

     * @param endTime

     * @param diffType

     * @returns {Number|number}

     * @constructor

     */

    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 divNum = 1;

        switch (diffType) {

            case "second":

                divNum = 1000;

                break;

            case "minute":

                divNum = 1000 * 60;

                break;

            case "hour":

                divNum = 1000 * 3600;

                break;

            case "day":

                divNum = 1000 * 3600 * 24;

                break;

            default:

                break;

        }

        return parseInt((eTime.getTime() - sTime.getTime()) / parseInt(divNum));

    }

    document.write(GetDateDiff("2015/03/25 09:50:00", "2015/03/25 13:07:00", "hour"))