<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8" />
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <title></title>

        <script src="jquery-3.5.1.min.js" type="text/javascript" charset="utf-8"></script>

        <script type="text/javascript">
            // 入口函数
            $(document).ready(function() {
                var jqInput = $("input");
                var jqDiv = $("div");

                jqInput.click(function() {
                    jqDiv.toggleClass("toggle");
                })
            });
        </script>

        <style type="text/css">
            div {
                height: 100px;
                width: 100px;
                background-color: aqua;
                margin: 10px;
            }

            .toggle {
                background-color: red;
            }
        </style>
    </head>
    <body>
        <input type="button" name="" id="" value="切换" />

        <div id="">

        </div>
    </body>
</html>

jquery类操作_html