救命啊问题出在哪……连弹窗都没有
<!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 a=confirm("是否打开网页");
if(a=true);
{var b=prompt("打开网址","http://www.imooc.com/")};
if(b=null);
{ window.open(_blank,'http://www.imooc.com/','width=400,height=500,menubar=no,toolbar=no'); }
else{window.open(blank,b,'width=400,height=500,menubar=no,toolbar=no')};
else {};
}
</script>
</head>
<body>
<input type="button" value="新窗口打开网站" onclick="openWindow()" />
</body>
</html>
