如何使用原生js實現移動端觸摸輪播？ | 網頁設計教學

PC端上實現圖片輪播效果很簡單，隻要通過使用click事件就可以非常簡單的實現效果，但是在移動端上，就要通過核心的touch事件來實現。下面是移動端手指滑動輪播圖的完整代碼。

<!DOCTYPE html>  
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<style>
*{margin:0;padding:0;}
li{list-style:none;}
 
.lb{width:320px;height:130px;position:relative;margin:20px auto;overflow: hidden;}
.lb .lb_img{width:2240px;height:130px;position:absolute;left:-320px;}
.lb .lb_img img{width:320px;height:130px;float:left;display:block;}
.lb ul{width:35px;height:4px;position:absolute;bottom:10px;left:50%;margin-left:-15px;}
.lb ul li{width:4px;height:4px;border-radius:2px;border:0.25px solid #fff;margin-left:2.5px;background:#666;float:left;cursor:pointer;}
.lb ul .active{background:#fff;}
.lb ul li:hover{background:#fff;}
 
</style>
</head>
<body>
<p class="lb">
        <p class="lb_img">
            <img src="img/4.jpg">
            <img src="img/0.jpg">
            <img src="img/1.jpg">
            <img src="img/2.jpg">
            <img src="img/3.jpg">
            <img src="img/4.jpg">
            <img src="img/0.jpg">
        </p>
        <ul>
            <li class="active"></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
        </ul>
</p>  
<script>
var lb = document.querySelector(".lb");
var lb_img = document.querySelector(".lb .lb_img");
var img = document.querySelectorAll(".lb .lb_img img")
var lis = document.querySelectorAll(".lb ul li");
var i=2;
    // 初始化手指坐標點
    var startPoint = 0;
    var startEle = 0;
    //手指按下
    lb.addEventListener("touchstart",function(e){
        startPoint = e.changedTouches[0].pageX;
        startEle = lb_img.offsetLeft;
        clearInterval(Time)
    });
     
    //手指滑動
    lb.addEventListener("touchmove",function(e){
        var currPoint = e.changedTouches[0].pageX;  
        var disX = currPoint - startPoint;
        var left = startEle + disX;
        lb_img.style.left = left + "px";       
    });
 
    //當手指抬起的時候，
    lb.addEventListener("touchend",function(e){
        var currPoint = e.changedTouches[0].pageX;
        var disX = - (currPoint - startPoint);
        var left = startEle + disX;
        if(disX > 150){
            i++;
            for(var q=0;q<lis.length;q++){
               lis[q].className = '';   
            }
            if(i == 7){
                i=2;
            }
            lis[i-2].className= "active" ;      
            lb_img.style.left = -320*(Math.round(disX/320)+i+1)+ 'px';              
        }else{
            lb_img.style.left = -320*(i-1) + "px";
        }
 
        if(disX < -150){
            i--;
            for(var q=0;q<lis.length;q++){
               lis[q].className = '';
            }
            if(i == 1){
                i=6;
            }
            lis[i-2].className= "active" ;          
            lb_img.style.left = -320*(Math.round(-disX/320)+i-2) + 'px';
         
        }else{
            lb_img.style.left = -320*(i-1) + "px";
        }
        Time=setInterval(autoplay,2000);
    })
//設置定時器
Time=setInterval(autoplay,2000);
    function autoplay(){
    i++;
    for(var q=0;q<lis.length;q++){
       lis[q].className = '';   
    }
    if(i == 7){
        i=2;
    }
    lis[i-2].className= "active" ;  
    for(var a=0; a<320;a++){
            setTimeout(function(){
                    var left = lb_img.style.left ? lb_img.style.left : "-320px";
                    left = parseInt(left)-1;
                    if(left<-1920){
                        left=-321;
                    }
                    lb_img.style.left = left + "px";
            },a);
        }
    }
 
</script>
</body>
</html>

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