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 / 1000 / 60 / 60 / 24);
    // 4.获取小时
    var hour = Math.floor(timespan / 1000 / 60 / 60);
    // 5.获取分钟
    var minute = Math.floor(timespan / 1000 / 60 - hour * 60);
    // 6.获取秒
    var second = timespan / 1000 - hour * 60 * 60 - minute * 60;
    return day + "@" + hour + "@" + minute + "@" + second;
}