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Javascript node relationship example analysis_javascript skills

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WBOYOriginal
2016-05-16 15:58:46981browse

This article analyzes the node relationship of Javascript with examples. Share it with everyone for your reference. The details are as follows: 

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>节点关系</title>
<script type="text/javascript">
function Demo() {
 var divObj = document.getElementById("divDemo");
 //获取父节点
 var parentNode = divObj.parentNode;
 //displayNodeInfo(parentNode);
 //获取子节点
 var childNodes = divObj.childNodes;
 //子节点返回的是一个集合，即数组
 //alert(childNodes.length); //显示节点个数
 //displayNodeInfo(childNodes[0]);
 //获取兄弟节点
 //----------获取上一个兄弟节点
 var preBrotherNode = divObj.previousSibling.previousSibling;
 //标签之间存在空行时，会出现一个空白的文本节点，在获取节点时，一定要注意。
 //displayNodeInfo(preBrotherNode);
 //----------获取下一个兄弟节点
 var nextBrotherNode = divObj.nextSibling;
 displayNodeInfo(nextBrotherNode);
}
function displayNodeInfo(node) {
 alert("Name:" + node.nodeName + ",Type:" + node.nodeType + ",Value:" + node.nodeValue);
}
</script>
</head>
<body>
<input type="button" value="测试" onclick="Demo()" />
<div id="divDemo">div内容</div>
<table>
  <tr>
    <td>单元格1</td>
    <td>单元格2</td>
  </tr>
  <tr>
    <td>单元格3</td>
    <td>单元格4</td>
  </tr>
</table>
</body>
</html>

I hope this article will be helpful to everyone’s JavaScript programming design.

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