为什么不行？谁帮忙看看
<!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 oppen=confirm("是否打开新的窗口？")
if(oppen==trum)
{window.open('http：//www.imooc.com/','width=400,
height=500,menubar=no,toolbar=no')
}
else
{window.close}
}
</script>
</head>
<body>
<input type="button" value="新窗口打开网站" onclick="openWindow()" />
</body>
</html>
