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.
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
