JavaScript/jQuery/css/toggleClass.html at master · lgope/JavaScript · GitHub

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<!DOCTYPE html>
<html>

<head>
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
    <script>
        $(document).ready(function () {
            $("#toggleBtn").click(function () {
                $("h1, h2, p, div").toggleClass("green");
            });

            $("#addClassedBtn").click(function () {
                $("h1, h2, p").addClass("blue");
                $("div").addClass("important");
            });
        });
    </script>
    <style>
        .green {
            color: green;
        }

        .important {
            font-weight: bold;
            font-size: xx-large;
        }

        .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>

    <div>This is some important text!</div><br>

    <button id="toggleBtn">Toggle class</button>
    <button id="addClassedBtn">Add classes to elements</button>

</body>

</html>