网页根据返回总秒数到计时

var intDiff = parseInt(600);//倒计时总秒数量function timer(intDiff){    window.setInterval(function(){        var day=0,            hour=0,            minute=0,            second=0;//时间默认值        if(intDiff > 0){            day = Math.floor(intDiff / (60 * 60 * 24));            hour = Math.floor(intDiff / (60 * 60)) - (day * 24);            minute = Math.floor(intDiff / 60) - (day * 24 * 60) - (hour * 60);            second = Math.floor(intDiff) - (day * 24 * 60 * 60) - (hour * 60 * 60) - (minute * 60);        }        if (minute <= 9) minute = '0' + minute;        if (second <= 9) second = '0' + second;        $('.i_min').html(minute);        $('.i_sec').html(second);        intDiff--;    }, 1000);}$(function(){    timer(intDiff);});