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What does nth-child(3n) mean in jquery?

黄舟Original: 2017-06-23 14:19:143062browse

:nth-child means matching the sub-elements below it: nth-child(Xn+Y) means starting from the Yth one. Increasing X can have: nth-child(3n+10) means starting from the 10th one. , 10, 13, 16, 19...:nth-child(3n), then Y=0, which can be omitted, indicating starting from 0, 0, 3, 6, 9...

I hope to You are helpful: Child element

:nth-child(index/even/odd/equation)

matches the Nth child or odd-even element under its parent element

Difference: ':eq(index)' only matches one element , and this one will match child elements for every parent element. :nth-child starts from 1, and :eq() starts from 0!

You can use ::nth-child(even), :nth-child(odd), :nth-child(3n), :nth-child(2), :nth-child(3n+1) , :nth-child(3n+2)

index (Number): The serial number of the element to be matched, starting from 1

Example finds the second li
# in each ul
##

<ul><li>John</li> <li>Karl</li> <li>Brandon</li></ul>
<ul><li>Glen</li> <li>Tane</li> <li>Ralph</li></ul>

Code:

$("ul li:nth-child(2)")

Result:

<li>Karl</li>, <li>Tane</li>

nth-child(3n+1) What does it mean?

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" " http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns=" http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
<script src="jquery-1.2.6.js" type="text/javascript" language="javascript"></script>
<style type="text/css">
<!--
-->
</style>
<script type="text/javascript" language="javascript" >
<!--
$(document).ready(function (){
$("#nav li:nth-child(3n+2) a").each(function(){
alert($(this).text());
});
});
-->
</script>
</head>
<body>
<ul id="nav">
<li><a href="#">1</a></li>
<li><a href="#">2</a></li>
<li><a href="#">3</a></li>
<li><a href="#">4</a></li>
<li><a href="#">5</a></li>
<li><a href="#">6</a></li>
<li><a href="#">7</a></li>
<li><a href="#">8</a></li>
<li><a href="#">9</a></li>
<li><a href="#">10</a></li>
</ul>
</body>
</html>

“:nth-child means matching the child elements below it: nth-child(Xn+Y) means starting from the Yth one, and increasing X can have:nth-child(3n+10) means Starting from the 10th one, 10, 13, 16, 19...:nth-child(3n) means Y=0, which can be omitted, meaning starting from 0, 0, 3, 6, 9..." This person answered The problem is, it seems that the minimum parameter of nth-child is also 1, and it starts from 1, not from 0.

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