这个示例代码有什么问题?o_O
<html>
    <head>
        <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
        <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.18/jquery-ui.min.js"></script>
        <script type="text/javascript">
            $(document).ready(function(){
                console.log("Testing");
                $('#test').append("Test");
            });
        </script>
        <title>Sin título 4</title>
</head>
<body>
    <div id="test">Hello world.</div>
</body>
</html>