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The steps for jquery to obtain the first few child elements: 1. Use the children() function to obtain all child elements. The syntax "parent element.children();" will return a jquery object containing all child elements; 2. . Use the :lt() selector to narrow the range of child elements obtained by children(). The syntax "parent element.children(:lt(index))" will only obtain the child elements whose index value is less than the specified number and return it.
The operating environment of this tutorial: windows7 system, jquery3.6.0 version, Dell G3 computer.
In jquery, you can use the children() function and the :lt() selector to get the first few child elements.
Implementation steps:
Step 1: Use children() to get all child elements
children() You can get all direct child elements under the specified parent node
父元素.children()
will return a jquery object containing all child elements
Step 2: Use:lt(index)Selector gets the first few child elements
Use: lt() selector to narrow the range of child elements obtained by children(), and only get elements whose index value is less than the specified number.
父元素.children(:lt(index))
This will return a jquery object containing the first several child elements
Complete sample code: Get the first two child elements li of the parent element ul
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="js/jquery-3.6.0.min.js"></script>
<script>
$(function () {
$("button").click(function () {
$("ul").children("li:lt(2)").css("background-color","red");
})
})
</script>
<style type="text/css">
ul{
background-color:yellow;
}
li{
border:1px solid red;
margin:10px;
}
</style>
</head>
<body>
<ul>
<li>香蕉</li>
<li>苹果</li>
<li>梨子</li>
<li>橘子</li>
</ul>
<button>父元素ul的前2个子元素li</button>
</body>
</html> 
Description: The
children() method returns all direct child elements of the selected element.
$(selector).children(filter)
| Parameter | Description |
|---|---|
| filter | Can select. Specifies a selector expression that narrows the search for child elements. |
:lt(index) The selector selects elements whose index value is less than the specified number.
index values start from 0.
The most common usage: used with other selectors to select elements before a specific sequence number in the specified combination (such as the example above).
[Recommended learning: jQuery video tutorial, web front-end video]
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