: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>
$("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>
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