求解为什么没成功?
<!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("是否新建网页?");
{var url=prompt("通过输入对话框,确定打开的网址"," http://www.imooc.com");
if(url!=null)
{window.open(url,"_blank",'width=400px,height=500px,menubar=no,toolbar=no');}
else
{alert("再见!");}
}
else
{alert("再见!");}
}
</script>
</head>
<body>
<input type="button" value="新窗口打开网站" onclick="openWindow()" />
</body>
</html>