dw里面正常运行，慕课网的编辑器不正常
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>window对象</title>
<script type="text/javascript">
function rec(){
var mymessage = confirm("欢迎来到慕课网！");
if(mymessage==true)
{
window.open("http://www.imooc.com","_blank","height=600,width=400");
}
}
</script>
</head>
<body>
<form>
<input type="button" value="点击我，打开新窗口" onclick="rec()" />
</form>
</body>
</html>
