为什么无法打开新窗口？
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>JS代码的位置</title>
<script type="text/javascript">
function open(){
window.open('http://www.imooc.com','_blank','width=100,height=100,top=10,left=10')
}
</script>
</head>
<body>
<script src="js/javascript.js">
</script>
<form>
<input type="button" value="按钮,点我" onclick="open()"/>
</form>
</body>
</html>
