js获取时间差值

 function GetTime(firstDate, secondDate) {

     // 1.对事件进行处理

     var firsttime = Date.parse(firstDate + " 00:00:00");

     var secondtime = Date.parse(secondDate + " 00:00:00");

     // 2.获取时间间隔

     var timespan = secondtime - firsttime;

     // 3.获取天

     var day = Math.floor(timespan /  /  /  / );

     // 4.获取小时

     var hour = Math.floor(timespan /  /  / );

     // 5.获取分钟

     var minute = Math.floor(timespan /  /  - hour * );

     // 6.获取秒

     var second = timespan /  - hour *  *  - minute * ;

     return day + "@" + hour + "@" + minute + "@" + second;

 }