How to replace page elements with javascript-JS Tutorial-php.cn

How to replace page elements with javascript

青灯夜游

Release： 2022-10-12 17:46:30

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In JavaScript, you can use the replaceChild() method to replace page elements. The function of this method is to replace a certain child node with a new node. The syntax is "parent node.replaceChild(new node, old node that needs to be replaced)" ".

How to replace page elements with javascript

The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.

In javascript, you can use the replaceChild() method to replace page elements.

replaceChild() method replaces a child node with a new node. This new node can be an existing node in the document, or you can create a new node.

Syntax:

node.replaceChild(newnode,oldnode)

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Parameters	Type	Description
newnode	Node object	Required. The node object you wish to insert.
oldnode	Node object	Required. The node object you wish to delete.

Example:

<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
	</head>
	<body>
		<div><b id="oldnode">JavaScript</b>是一个很常用的技术，为网页添加动态效果。</div><br />
		<button onclick="replaceMessage()"> 将加粗改为斜体</a>

			<script type="text/javascript">
				function replaceMessage() {
					var oldNode = document.getElementById("oldnode"); //提取老元素；
					var newNode = document.createElement("i"); //创建一个新的节点；
					newNode.innerHTML = oldNode.innerHTML; //把旧的oldnode内容赋值给新的newnode，要不然newnode是无内容，只是简单的改了个属性，把b变成了i，显示出来的是空；
					oldNode.parentNode.replaceChild(newNode, oldNode); //实现子节点(对象)的替换，返回被替换对象的引用；
				}
			</script>

	</body>
</html>

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How to replace page elements with javascript

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