移动端可拖动导航菜单小demo

<!DOCTYPE html>

<html lang="en">

<head>

    <title>移动端滑动导航菜单</title>

    <meta charset="utf-8" />

    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0" />

    <style>

        /*nav*/

        .m-nav{

            position: relative;

            height:3rem;

        }

        .frame{margin: 0 10px; height:100%;    padding-right:50px;background-color: #00a0e9}

        .nav-box{

            position: relative;

            height:100%;

            overflow: hidden;

        }

        .m-nav ul{

            position: relative;

            left:0;

            margin: 0.5rem;padding: 0;

            list-style: none;

            width:9999px;

            height:100%;

        }

        .m-nav li{

            float:left;

            margin:0;

            padding-right: 10px;

        }

        .m-nav li a{

            text-decoration: none;

            color:#000;

            display: inline-block;

        }

        .menu-btn{

            position: absolute;

            top:0px;

            right:10px;

            width:40px;

            float:left;

            margin-left: 2%;

            display:block;

            height: 3rem;

            text-align: center;

            background-color:red;

        }

    </style>

</head>

<body>

<!--菜单-->

<div class="m-nav">

    <div class="frame">

        <div class="nav-box" id="nav-box">

            <ul class="nav-list" id="nav-list">

                <li><a href="" class="list-item">111一级建造师</a></li>

                <li><a href="" class="list-item">222一级建造师</a></li>

                <li><a href="" class="list-item">333一级建造师</a></li>

                <li><a href="" class="list-item">444一级建</a></li>

                <li><a href="" class="list-item">5555一级建造师</a></li>

                <li><a href="" class="list-item">6666一级建造师</a></li>

                <li><a href="" class="list-item">7777一级建造师</a></li>

                <li><a href="" class="list-item">8888一级建造师</a></li>

                <li><a href="" class="list-item">9999一级建造师</a></li>

                <li><a href="" class="list-item">100000建造师</a></li>

            </ul>

        </div>

        <a href="javascript:void(0);" class="menu-btn" id="menu-btn" ></a>

    </div>

</div>

<script>

    window.onload = function(){

        var isdrag = false;//是否允许再拖动

        var leftDis,curPage;//ul的left值,当前拖动开始时坐标

        var list = document.getElementById("nav-list");

        var finalLeft;//拖动结束时ul的left

        var liPadding = 10;//li的间距

        var items = document.getElementsByClassName("list-item");//li内a标签集合

        var totalWidth = 0;//ul的实际宽度

        var navBox = document.getElementById("nav-box");//ul外div

        var boxWidth;

        var isShow = false;

        //获取ul外div的宽度

        boxWidth = parseInt(window.getComputedStyle(navBox,null).width);

        //计算ul的实际宽度

        for(var i = 0;i<items.length;i++){

            totalWidth += parseInt(window.getComputedStyle(items[i],null).width);

        }

        totalWidth = totalWidth+items.length*liPadding;

        //设置ul的宽度值,否则li将会换行

        list.style.width = totalWidth+10+'px';

        //绑定事件

        list.addEventListener('touchstart',startMouse);

        list.addEventListener('touchmove',moveMouse);

        list.addEventListener('touchend',function(){

            isdrag = false;

        });

        function startMouse(e){

            isdrag = true;

            leftDis = parseInt(list.style.left+0);//ul的left值

            curPage = e.touches[0].pageX;//手指触摸开始时的坐标

            return false;

        }

        function moveMouse(e){

            if (isdrag){

                finalLeft = leftDis + e.touches[0].pageX - curPage;//触摸结束时ul的left值

                console.log(finalLeft);

                if(finalLeft<=-(totalWidth-boxWidth)||finalLeft>=0){//滑到最末一页时

                    return false;

                }

                else{

                    list.style.left = finalLeft +'px';

                }

            }

        }

        //点击菜单按钮显示全部

        var menuBtn = document.getElementById("menu-btn");

        menuBtn.onclick = function(){

            if(!isShow){

                list.removeEventListener('touchstart',startMouse);

                list.removeEventListener('touchmove',moveMouse);

                list.style.width = boxWidth+'px';

                list.style.left = '0px';

                navBox.style.overflow = 'visible';

                navBox.style.height = 'auto';

                isShow = true;

            } else{

                list.addEventListener('touchstart',startMouse);

                list.addEventListener('touchmove',moveMouse);

                list.style.width = totalWidth+10+'px';

                navBox.style.overflow = 'hidden';

                navBox.style.height = '100%';

                isShow = false;

            }

        }

    };

</script>

</body>

</html>
放在手机上,滑动快了会有抖动,还不知道什么原因