JS一段网页跳转的代码跳转不成功，过一会儿又可以跳转成功

<script type="text/javascript">

function delayURL(url,time){
    setTimeout("window.top.location.href='"+url+"'",time);
}


</script>
3秒钟后自动跳转，如没有跳转，请点击下面的链接

<script type="text/javascript">
delayURL("article.jsp",3000);
</script>
<a href="http://localhost:8080/BBS/article.jsp">点击这里回到首页</a>