js:获取节点相关的 nodeName,nodeType,nodeValue

getElementById()
getElementsByName()

getElementsByTagName()
hasChildNodes()
nodeName

nodeType=1元素节点/2属性节点/3文本节点
nodeValue

 1     <script type="text/javascript">

 2     //取得input元素的名字 nodeName,类型nodeType值nodeValue;

 3             var inputElement=document.getElementById("tid");

 4             var nodeName=inputElement.nodeName;

 5             var nodeType=inputElement.nodeType;

 6             //元素节点的nodeValue返回的是null

 7             var nodeValue=inputElement.nodeValue;

 8             alert(nodeName+":"+nodeType+":"+nodeValue);

 9

10     //取得input元素属性名字nodeName,类型nodeType,nodeValue

11             var inputElement=document.getElementById("tid");

12             var typeAttrElement=inputElement.getAttributeNode("type");

13             var nodeName=typeAttrElement.nodeName;

14             var nodeType =typeAttrElement.nodeType;

15             var nodeValue=typeAttrElement.nodeValue;

16             alert(nodeName+":"+nodeType+":"+nodeValue);

17     </script>