How to query child elements in jquery: 1. Use the children() method to get the direct subset elements under the specified element; 2. Use the find() method to get all the elements under the specified element (including children). subset of a set) subset element.
The operating environment of this tutorial: windows7 system, jquery1.10.2 version, Dell G3 computer.
jQuery child element selector find() and children()
children() method: Get the element The direct subset element under
find() method: Get all (including subsets of subsets) subset elements under this element
<html>
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
div{
/*background-color: pink;*/
}
</style>
</head>
<body>
<div>
<span>11</span>
<span>
<ul>
<li class="no1">aaa</li>
<li>bbb</li>
<li>ccc</li>
</ul>
</span>
<span>222</span>
<ul>
<li>ddd</li>
<li>eee</li>
<li>fff</li>
</ul>
</div>
</body>
<script src="http://code.jquery.com/jquery-latest.js"></script>
<script>
$("div").children(".no1").css({color:'#a61c00',backgroundColor:"#0000ff"});
console.log($("div").children(".no1")[0]); // 打印获取到的dom元素 这时你会发现结果为 undefined
// $("div").find(".no1").css({color:'#a61c00',backgroundColor:"#0000ff"});
</script>
</html> 
At this point we will open the find item and comment
<html>
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
div{
/*background-color: pink;*/
}
</style>
</head>
<body>
<div>
<span>11</span>
<span>
<ul>
<li class="no1">aaa</li>
<li>bbb</li>
<li>ccc</li>
</ul>
</span>
<span>222</span>
<ul>
<li>ddd</li>
<li>eee</li>
<li>fff</li>
</ul>
</div>
</body>
<script src="http://code.jquery.com/jquery-latest.js"></script>
<script>
// $("div").children(".no1").css({color:'#a61c00',backgroundColor:"#0000ff"});
// console.log($("div").children(".no1")[0]);
$("div").find(".no1").css({color:'#a61c00',backgroundColor:"#0000ff"});
console.log($("div").find(".no1")[0]);
</script>
</html>Corresponding screenshot:
Summarize the differences :
The children() method returns all direct child elements of the selected element (direct child elements, only sons and not grandchildren (: that is to say, no recursive traversal)
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