把下面的代码存为一个.rhtml文件，就可以实现简单的拖拽了
复制内容到剪贴板
代码:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>title</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<%= javascript_include_tag :defaults %>
<style>
div{
background-color:green;
color:red;
width:300px;
height:100px;
}
</style>
</head>
<body>
<div id="dragDIV" style="cursor:move">drag</div>
<%= javascript_tag "new Draggable('dragDIV')" %>
<div id="dragGreen" class="green box">drag</div>
<%= draggable_element :dragGreen, :revert => true %>
</body>
</html>
