函数代码:

复制代码 代码如下:

document.getElementByIdx_x=function(id){

if(typeof id =='string')

return document.getElementById(id);

else

throw new error('please pass a string as a id!')

}

实例代码:

复制代码 代码如下:

<div id='box'>9</div>

<script>

document.getElementByIdx_x=function(id){

if(typeof id =='string')

return document.getElementById(id);

else

throw new error('please pass a string as a id!')

}

var timer = window.setInterval(function(){

document.getElementByIdx_x('box').innerHTML = parseInt(document.getElementByIdx_x('box').innerHTML) - 1;

if(parseInt(document.getElementByIdx_x('box').innerHTML) < 0)

{

window.clearInterval(timer);

window.location = 'http://www.jb51.net';

}

}, 1000);

</script>