getContinueTime() JavaScript计算一个事件已进行的时间

function getContinueTime(startTime) {
    //当前时间与指定的时间的差值
    var time = (new Date() - new Date(startTime)) / 1000,
        serviceTime = ‘‘,
        days = Math.floor(time / 3600 / 24),
        hours = Math.floor(time / 3600 % 24),
        minutes = Math.floor(time / 60 % 60),
        seconds = Math.floor(time % 60);

    hours = hours && hours < 10 ? ‘0‘ + hours : hours;
    minutes = minutes && minutes < 10 ? ‘0‘ + minutes : minutes;
    seconds = seconds && seconds < 10 ? ‘0‘ + seconds : seconds;

    days ? serviceTime += days + ‘天‘ : ‘‘;
    hours ? serviceTime += hours + ‘时‘ : ‘‘;
    minutes ? serviceTime += minutes + ‘分‘ : ‘‘;
    serviceTime += seconds + ‘秒‘;
    return serviceTime
}

getContinueTime(‘2015/01/01‘);