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Can javascript add tags?

青灯夜游Original: 2022-01-19 11:02:203258browse

Javascript can add labels. Method: 1. Use the "document.createElement("label name")" statement to create a new label node; 2. Use the insertBefore() or appendChild() function before specifying the child element node. or insert a new label node afterwards.

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

There are two cases of node insertion: appending a child node after the element's child node list and inserting a child node in front of a child node of the element:

The first way Case call: element.appendChild (child node);
The second case call: element.insertBefore (new node, existing node).

Example 1:Append child nodes after the element child node list

<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
	</head>
	<body>

		<ul id="myList">
			<li>Coffee</li>
			<li>Tea</li>
		</ul>
		<p id="demo">单击按钮将项目添加到列表中</p>
		<button onclick="myFunction()">点我</button>
		<script>
			function myFunction() {
				var node = document.createElement("LI");
				var textnode = document.createTextNode("Water");
				node.appendChild(textnode);
				document.getElementById("myList").appendChild(node);
			}
		</script>
	</body>
</html>

Can javascript add tags?

Note:

First create a node,
Then create a text node,
Then add the text node Add it to the LI node.
Finally add the node to the list.

Example 2: Insert a child node in front of a child node of the element

<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
	</head>
	<body>

		<ul id="myList">
			<li>Coffee</li>
			<li>Tea</li>
		</ul>
		<p id="demo">单击按钮插入一个项目列表</p>
		<button onclick="myFunction()">点我</button>
		<script>
			function myFunction() {
				var newItem = document.createElement("LI")
				var textnode = document.createTextNode("Water")
				newItem.appendChild(textnode)
				var list = document.getElementById("myList")
				list.insertBefore(newItem, list.childNodes[0]);
			}
		</script>
	</body>
</html>

Can javascript add tags?

Note:

First create a li node,
Then create a text node,
Then add the text node in the li node.
Finally insert the li node into the first child node list.

[Related recommendations: javascript learning tutorial]

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