<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }

        .nav-logo{
            float: left;
            line-height: 40px;
            width: 100px;
        }

        .nav{
            float: right;
            /* background-color: red; */

        }
        .nav ul{
            float: left;
        }
        .nav li{
            float: left;
            width: 100px;
            line-height: 40px;
            text-align: center;
        }

        @media screen and (max-width:800px) {
            .nav-logo{
                float: none;
            
            }
            .nav-logo span{
                display: inline-block;
                width: 40px;
                height: 40px;
                background-color: red;
                position: absolute;
                top: 0;
                right: 0;
            }
            .nav{
            float: none;
            margin-left: -200%;

        }
        .nav ul{
            text-align: center;
            float: none;
        }
        .nav li{

            float: none;
            width: 100%;
            line-height: 40px;
            text-align: center;
        }
}
    </style>
</head>
<body>
    <div cla="nav-box">
        <div class="nav-logo">
            我是logo
            <span onclick="btn()"></span>
        </div>

        <nav class="nav" id='nav'>
            <ul>
                <li>
                    首页aa
                </li>
                <li>
                    产品列表
                </li>
                <li>
                    服务咨询
                </li>
                <li>
                    关于我们
                </li>
                <li>
                    联系我们
                </li>
            </ul>
        </nav>
    </div>
</body>

<script>
    var nums= 0;

    function btn(){
        nums++;
        var navs = document.getElementById('nav');
        navs.style.transition = '1s';
        if(nums%2==1){
            navs.style.marginLeft = '0';
            navs.style.background = 'blue';
        }else{
            navs.style.marginLeft = '-200%';
            navs.style.background = '';
        }
    }
</script>
</html>
Last modification：November 28, 2020
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