console 命令行工具 X clear
console
<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>两列伸缩栏</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }
        
        .outter {
            width: 800px;
            border: 2px solid black;
            overflow: hidden;
            margin: 0 auto;
        }
        
        .left {
            width: 20%;
            height: 500px;
            float: left;
            background-color: aliceblue;
        }
        
        .right {
            width: 80%;
            height: 500px;
            float: left;
            background-color: lightpink;
        }
        
        #bar {
            width: 30px;
            height: 50px;
            padding-left: 5px;
            background-color: grey;
            border-bottom-right-radius: 15px;
        }
    </style>
    <script src="js/jquery-1.11.1.min.js"></script>
    <script>
        $(function() {
            $('#bar').click(function() {
                var left = $('.left');
                var right = $('.right');
                var bar = $('#bar');
                // 点击控制按钮，要先判断左边栏是否隐藏
                if (left.is(':hidden')) {
                    left.show();
                    right.css('width', '80%');
                    bar.html('隐藏');
                } else {
                    left.hide();
                    right.css('width', '100%');
                    bar.html('显示');
                }
            });
        });
    </script>

</head>

<body>
    <div class="outter">
        <div class="left">
            <ol>
                <li>菜单1</li>
                <li>菜单2</li>
                <li>菜单3</li>
                <li>菜单4</li>
                <li>菜单5</li>
            </ol>
        </div>
        <div class="right">
            <div id="bar">隐藏</div>
        </div>
    </div>
</body>

</html>
本项目引用的自定义外部资源

jquery.js