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javascript倒计时功能实现代码

　　本文标签：倒计时

代码如下:
复制代码 代码如下:

/**
* 倒计时
*
* @author WadeYu
* @date 2012-04-20 17:40
* @copyright boyaa.com
*/
var TimeCountDown = function( initTime ){
var day = 0;
var hour = 0;
var minute = 0;
var second = 0;
var timerId = 0;
var self = this;
var fixInitTime = function(){
initTime = parseInt(initTime);
if ( isNaN(initTime) || initTime < 0 ){
initTime = 0;
}
};
var fixZero = function(num){
return num < 10 ? (0+num) : num;
};
var calc = function(){
showCallback.call(self, [fixZero(day), fixZero(hour), fixZero(minute), fixZero(second)]);
if ( day === 0 && hour === 0 && minute === 0 && second === 0){
self.stop();
} else {
if (hour === 0 && day > 0){
hour = 24;
day--;
}
if (minute === 0 && hour > 0){
minute = 60;
hour--;
}
if (second === 0 && minute > 0){
second = 59;
minute--;
} else {
second--;
}
timerId = window.setTimeout(function(){
calc();
}, 1000);
}
};
var showCallback = function(){
alert(Please set show callback functions!);
};
var init = function(){
fixInitTime();
if ( initTime > 0 ){
day = Math.floor( (initTime / (24*60*60)) );
initTime -= day * 24*60*60;
hour = Math.floor( initTime / (60*60) );
initTime -= hour * 60*60;
minute = Math.floor( initTime / 60 );
second = initTime - minute * 60;
}
};
this.start = function(){
calc();
};
this.stop = function(){
timerId && window.clearTimeout(timerId);
};
this.setShowCallback = function(fn){
typeof(fn) === function ? (showCallback = fn) : ;
};
init();
};

示例如下:
复制代码 代码如下:

<body>
<div id="timeCon"></div>
<script type="text/javascript">
var timeCountDown = new TimeCountDown(3 * 24 * 60 * 60);
timeCountDown.setShowCallback(function( obj ){ // [天, 小时, 分, 秒]
document.getElementById(timeCon).innerHTML = obj[0] + ":" + obj[1] + ":" + obj[2] + : + obj[3];
});
timeCountDown.start();
</script>
</body>