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<!DOCTYPE html> <html> <head> <script src="http://www.sargonco.com/Uploads/Public/article/webdistut/javascript/jquery-3.2.1.min.js"></script> <script> $(document).ready(function(){ $("button").click(function(){ $("h1, h2, p").toggleClass("blue"); }); }); </script> <style> .blue { color: blue; } </style> </head> <body> <h1>Heading 1</h1> <h2>Heading 2</h2> <p>This is a paragraph.</p> <p>This is another paragraph.</p> <button>Toggle class</button> </body> </html>
Heading 1
Heading 2
This is a paragraph.
This is another paragraph.
Toggle class