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getElementByIdx_x js自定义getElementById函数

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>