统一目录下的资源结构图：
<html>
<head>
<link rel="stylesheet" href="gallery.css" type="text/css" media="screen" charset="utf-8"/>
<script type="text/javascript" src="script.js"></script>
</head>
<body>
<div ></div>
</fieldset>
</div>
</div>
</div>
</body>
</html>
<head>
<link rel="stylesheet" href="gallery.css" type="text/css" media="screen" charset="utf-8"/>
<script type="text/javascript" src="script.js"></script>
</head>
<body>
<div ></div>
</fieldset>
</div>
</div>
</div>
</body>
</html>