var tms = []; 
var day = [];  
var hour = []; 
var minute = []; 
var second = []; 
function takeCount() { 
    setTimeout("takeCount()", 1000); 
    for (var i = 0, j = tms.length; i < j; i++) { 
        //计数减一 
        tms[i] -= 1000; 
        //计算时分秒 
        var days = Math.floor(tms[i] / (1000 * 60 * 60 * 24)); 
        var hours = Math.floor(tms[i] / (1000 * 60 * 60)) % 24; 
        var minutes = Math.floor(tms[i] / (1000 * 60)) % 60; 
        var seconds = Math.floor(tms[i] / 1000) % 60; 
        if (days < 0) 
        days = 0; 
        if (hours < 0) 
        hours = 0; 
        if (minutes < 0) 
        minutes = 0; 
        if (seconds < 0) 
        seconds = 0; 
        //将时分秒插入到html中
        
        try {
            document.getElementById(day[i]).innerHTML = days; 
            document.getElementById(hour[i]).innerHTML = hours; 
            document.getElementById(minute[i]).innerHTML = minutes; 
            document.getElementById(second[i]).innerHTML = seconds;
        } catch (e) {
            
        }
    } 
} 
setTimeout("takeCount()", 1000);