Add steps: 1. Use the ":nth-child(n)" selector to select the child node in the middle position, the syntax is "parent element object.find(":nth-child (position value of the middle element) ")" will return a jQuery object containing the specified element; 2. Use after() to insert a new node after the middle element, the syntax is "middle element object.after (child node element)".
The operating environment of this tutorial: windows7 system, jquery3.6.1 version, Dell G3 computer.
In jquery, you can use :nth-child(n) and after() to add child nodes to the middle position.
Implementation steps
Step 1: Use:nth-child(n) selector to select the child node in the middle position
父元素对象.find(":nth-child(中间元素的位置值)")Will return a jQuery object containing the specified element.
Step 2: Use the after() function to insert a new node after the middle element
after() can insert a sibling node after the specified element
$(A).after(B)
means inserting the B sibling node behind the outside of the A node.
Implementation sample code
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="js/jquery-3.6.1.min.js"></script>
<script>
$(function() {
$("button").click(function() {
var a = "<li style='color:red;'>榴莲（新的子节点）</li>";
$("ul").find(":nth-child(3)").after(a);
})
})
</script>
</head>
<body>
<ul style="border: 1px solid red;">
<li>香蕉</li>
<li>苹果</li>
<li>梨子</li>
<li>橘子</li>
<li>桃子</li>
</ul>
<button>在ul的中间位置增加子节点</button>
</body>
</html>
Description: :nth-child() selector
:nth-child(n) selector selects all elements that are the nth child element of any type of its parent element.
:nth-child(n|even|odd|formula)
| Parameters | Description |
|---|---|
| n | To The index of each child element that matched. must be a number. The index number of the first element is 1. |
| even | Select every even child element. |
| odd | Select every odd child element. |
| formula | Specifies which sub-element should be selected through the formula (an b). Example: p:nth-child(3n 2) selects every third segment, starting from the second child element. |
[Recommended learning: jQuery video tutorial, web front-end video】
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