Can javascript add tags?
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>
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>
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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