<body>
    <div id="box">box
    <input type="button" id="btn" value="chang color!">
    </div>
</body>
<style>
        body {
            font-family: '微軟正黑體'; font-size: 11pt;
        }
        div {
            float: left; height: 150px; border: 1px solid #000;
        }
        #box {
            height: 250px; width: 250px;
        }
        .highlight {
            background-color: #FF6;
        }
    </style>

        //開關CSS顏色樣式
        $(document).ready(function(){
            $('#btn').click(function(){
                $('#box').toggleClass('highlight');
            });
        });

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

  1. https://cdnjs.cloudflare.com/ajax/libs/jquery/3.4.1/jquery.min.js