alert(GetDateDiff("2018-02-27 19:20:22","2018-02-27 09:20:22","hour"));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));
}