模仿头条导航的左右滚动效果

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width,initial-scale=1,maximum-scale=1,user-scalable=no">
    <title></title>
    <script src="https://cdn.bootcss.com/jquery/3.4.1/jquery.min.js"></script>
    <style>
        .scroll{
            width:2000px;
            height:100px;
            display: flex;
            flex-direction: row;
            border:1px solid gray;
            position: fixed;
            top: 0;
            left:0;
        }
        .flex-item{
            flex: 14;
            border-right: 1px solid gray;
            line-height: 100px;
            text-align: center;
        }
    </style>
</head>
<body>
 
<div class="scroll">
    <div class="flex-item">推荐</div>
    <div class="flex-item">热点</div>
    <div class="flex-item">视频</div>
    <div class="flex-item">济南</div>
    <div class="flex-item">社会</div>
    <div class="flex-item">头条</div>
    <div class="flex-item">问答</div>
    <div class="flex-item">图片</div>
    <div class="flex-item">娱乐</div>
    <div class="flex-item">科技</div>
    <div class="flex-item">汽车</div>
    <div class="flex-item">体育</div>
    <div class="flex-item">财经</div>
    <div class="flex-item">军事</div>
</div>
 
<script>
    var startX=0;
    var startY=0;
    var enX=0;
    var screenWidth=$(window).width();
    var elementWidth=$(".scroll").width();
    var lei=0;
    var flag=false;
    var flag1=false;
 
    var leijia=0;
    $('body').bind('touchstart',function(e){
        startX = e.originalEvent.changedTouches[0].pageX,
                startY = e.originalEvent.changedTouches[0].pageY;
 
    });
    $('body').bind('touchend',function(e){
        enX = e.originalEvent.changedTouches[0].pageX
            console.log("离开屏幕*********"+enX)
        lei=enX-startX;
        leijia=leijia+lei;
 
    });
    $('body').bind('touchmove',function(e){
        //获取滑动屏幕时的X,Y
 
        endX = e.originalEvent.changedTouches[0].pageX,
                endY = e.originalEvent.changedTouches[0].pageY;
        //获取滑动距离
        distanceX = endX-startX;
        distanceY = endY-startY;
        //判断滑动方向
        if(Math.abs(distanceX)>Math.abs(distanceY) && distanceX>0){
            console.log('往右滑动');
            if(flag){
                leijia=-(elementWidth-screenWidth);
                flag=false;
            }
            var offsetop=$(".scroll").offset().left;
            if(offsetop<0){
                $(".scroll").css({'left':leijia+distanceX});
            }else{
                $(".scroll").css({'left':0});
                leijia=0;
                flag1=true;
            }
        }else if(Math.abs(distanceX)>Math.abs(distanceY) && distanceX<0){
            console.log('往左滑动'+"*********"+leijia);
            if(flag1){
                leijia=0;
                flag1=false;
            }
            var offsetop=$(".scroll").offset().left;
            if(offsetop>-(elementWidth-screenWidth)){
                $(".scroll").css({'left':leijia+distanceX});
            }else{
                $(".scroll").css({'left':-(elementWidth-screenWidth)});
                leijia=-(elementWidth-screenWidth);
                flag=true;
            }
            console.log("offsetTop********************"+$(".scroll").offset().left)
        }else if(Math.abs(distanceX)<Math.abs(distanceY) && distanceY<0){
            console.log('往上滑动');
        }else if(Math.abs(distanceX)<Math.abs(distanceY) && distanceY>0){
            console.log('往下滑动');
        }else{
            console.log('点击未滑动');
        }
 
    });
     
</script>
</body>
</html>