//方法
function countDownTimerCallback(a) {
var h = addZero(Math.floor(a / 3600));
m = addZero(Math.floor(a / 60) % 60),
s = addZero(Math.floor(a) % 60);
d = h + "时" + m + "分" + s + "秒";
document.getElementById("countdown").innerHTML = "时间还有" + d
}function addZero(n){
if(n < 10){
n = '0'+n;
}
return n;
};
//倒计开始
var t = 60;
var thisSetInterval = setInterval(function(){
if(t>=0){
countDownTimerCallback(t);
t--
}else{
clearInterval(thisSetInterval);
}
},1000);
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