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

     <script type="text/javascript">
     //取得input元素的名字 nodeName,类型nodeType值nodeValue;
             var inputElement=document.getElementById("tid");
             var nodeName=inputElement.nodeName;
             var nodeType=inputElement.nodeType;
             //元素节点的nodeValue返回的是null
             var nodeValue=inputElement.nodeValue;
             alert(nodeName+":"+nodeType+":"+nodeValue);

     //取得input元素属性名字nodeName,类型nodeType,nodeValue
             var inputElement=document.getElementById("tid");
             var typeAttrElement=inputElement.getAttributeNode("type");
             var nodeName=typeAttrElement.nodeName;
             var nodeType =typeAttrElement.nodeType;
             var nodeValue=typeAttrElement.nodeValue;
             alert(nodeName+":"+nodeType+":"+nodeValue);
     </script>