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<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>find()</title> <script src="https://code.jquery.com/jquery-3.6.0.min.js"></script> <style>.hit{background:yellow;}</style> </head> <body> <div id="root"> <ul> <li class="item">One</li> <li>Two<ul><li class="item">Two-A</li></ul></li> <li class="item">Three</li> </ul> </div> <button id="find">Find .item</button> <script> $("#find").click(function(){ $("#root").find(".item").toggleClass("hit"); }); </script> </body> </html>
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