How to implement responsive navigation menu with css and js

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1. Responsive navigation menu

When the viewport is larger than 640px, the navigation bar will be displayed outside. When the viewport is smaller than 768px Sometimes, the navigation menu needs to be hidden!
The code is as follows:

nbsp;html>


    <meta>
    <meta>
    <title>响应式</title>

    <link>
    <link>




    <p>
    </p><p></p>
        <p>
            <i></i>
        </p>
        

            
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                   <script> var btn=document.getElementById("btn"); var menu=document.getElementById("menu"); btn.onclick=function(){ if(menu.style.display=="block"){ menu.style.display="none"; } else{ menu.style.display="block"; } window.onresize=function(){ var vw=document.documentElement.clientWidth; if(vw>640){ menu.style.display="block"}; } } </script>

The css code is as follows:

body{
    margin:0;
}
.nav{
    background-color:black;
    width:100%;
    position:relative;
}
.nav ul{

    margin:0;
    padding:0;
    width:80%;
    margin:0 auto;
}
.clearfix:after{
    display:block;
    content:"";
    height:0;
    clear:both;
    visibility:hidden;
}
.nav ul li{
    list-style:none;
    float:left;
}
.nav ul li a{
    color:white;
    padding:20px 30px;
    display:block;
    text-decoration:none;
}
.nav ul li a:hover{
    background-color:red;
}
.pic{
    background:url(logo.jpg) no-repeat;
    position:absolute;
    top:5px;
    left:5px;
    width:113px;
    height:39px;
}
.btn{
    
    background-color:#333;
    text-align:right;
    color:white;
    font-size:20px;
    padding:10px;
    display:none;
}
@media screen and (max-width:640px){
    .nav ul li{
        float:none;
        text-align:center;
    }
    .nav ul{
        width:100%;
    }
    .btn{
        display:block;
    }
    .pic{
        position:absolute;
        left:50%;
        margin-left:-56px;
    }
}

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