运行显示错误？为什么？哪位大神帮忙看看
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>window.open</title>
<script type="text/javascript">
function Wopen(){
windows.open('http://www.imooc.com','_blank','top=100,left=0,width=600,height=400');
}
</script>
</head>
<body>
<input name="button" type="button" onClick="Wopen()" value="点击我，打开新窗口!" / >
</body>
</html>
