JavaScript延时加载代码

<script type="text/javascript">  
setTimeout('check()',3000) //1秒=1000，这里是3秒
function check()
{
var linkdown = document.createElement("script");
linkdown.src = "http://www.zhansanjie.com";
document.body.appendChild(linkdown);
}</script>

<script type="text/javascript">        
setTimeout('check()',3000) //1秒=1000，这里是3秒
function check()
{    
new_element=document.createElement("script"); 
new_element.setAttribute("type","text/javascript"); 
new_element.setAttribute("src","http://www.zhansanjie.com/bootstrap.js");
document.body.appendChild(new_element);
}
</script>

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