ownDocument和documentElement

 <!DOCTYPE html>

 <html>

 <head>

     <meta name="viewport" content="width=device-width" />

     <title>Index20140825</title>

 </head>

 <body>

     <div>

         <input type="button" name="" value="点击" id="btn" />

     </div>

 </body>

 </html>

 <script type="text/javascript">

     alert(document.getElementById('btn').ownerDocument.nodeName + ' ' + document.getElementById('btn').ownerDocument.documentElement.nodeName);

 </script>

document.getElementById('btn').ownerDocument.nodeName 返回节点所属的根元素
document.getElementById('btn').ownerDocument.documentElement.nodeName 返回文档的根节点

巴特西

ownDocument和documentElement

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