请问哪里有问题?
<!DOCTYPE html>
<html>
<head>
<title> new document </title>
<meta http-equiv="Content-Type" content="text/html; charset=gbk"/>
<script type="text/javascript">
function openWindow();
{
var open=confirm(是否打开此窗口?);
if(open==true)
{var opening=prompt("请输入网址:","http://www.imooc.com/")
if(opening=="null")
{window.open("http://www.imooc.com/","_blank","width=400px,height=500px,menubar=no,toolbar=no");
}
else{alert("输入错误");}
else
{alert("再见!");}
}
</script>
</head>
<body>
<input type="button" value="新窗口打开网站" onclick="openWindow()" />
</body>
</html>