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>