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clonenode usage

zbt

Nov 24, 2023 am 10:51 AM

clonenode

In JavaScript, cloneNode() is a method used to copy nodes. Can be used to copy element nodes in HTML documents, and you can choose whether to copy all child nodes of the node.

clonenode usage

#In JavaScript, cloneNode() is a method used to copy nodes. It can be used to copy element nodes in an HTML document, and you can choose whether to copy all child nodes of the node. The cloneNode() method is The method provided by DOM (Document Object Model), the following is its basic usage:

var originalNode = document.getElementById("originalElement");
var clonedNode = originalNode.cloneNode(true);

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In the above code, originalNode Represents the original node to be copied, which can be any HTML element. The parameter true in cloneNode(true) means to copy the node and all its child nodes. If false is passed, only the node itself will be copied.

It should be noted that the cloneNode() method will only copy the attributes of the element itself and all its child elements, but will not copy the event listeners or data added to the original element. At the same time, the copied node will be separated from the document flow, which means that it is a completely independent copy in the memory. Any operation on the copied node will not affect the original node.

The following is a more comprehensive example demonstrating the use of cloneNode():

<!DOCTYPE html>
<html>
<body>
<div id="original">Original Node
  <span>Subnode 1</span>
  <span>Subnode 2</span>
</div>
<button onclick="cloneElement()">Clone Node</button>
<script>
function cloneElement() {
  var originalNode = document.getElementById("original");
  var clonedNode = originalNode.cloneNode(true);
  clonedNode.id = "cloned"; // 修改克隆节点的id属性
  document.body.appendChild(clonedNode);
}
</script>
</body>
</html>

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In the above example, click "Clone Node" button will clone the original node and add it to the end of the document. You can open this example in a browser and click the button to see a clone of the original node added to the page.

The cloneNode() method is a very useful tool that can help us dynamically create and manage element nodes in JavaScript without affecting the original node.

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