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)" ".
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)
| 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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