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JS makes mobile touch carousel effect

php中世界最好的语言Original: 2018-04-14 09:45:341794browse

This time I will bring you JS to create a mobile touch carousel effect. What are the precautions to use JS to create a mobile touch carousel effect? The following is a practical case, let’s take a look.

The following is the complete code for the finger sliding carousel on the mobile terminal.

<!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;
 // 初始化手指坐标点
 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)
 });
 
 //手指滑动
 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"; 
 });
 //当手指抬起的时候，
 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 = &#39;&#39;; 
	 }
	 if(i == 7){
	 	i=2;
	 }
	 lis[i-2].className= "active" ;	 	
 	lb_img.style.left = -320*(Math.round(disX/320)+i+1)+ &#39;px&#39;; 		
 }else{
 	lb_img.style.left = -320*(i-1) + "px";
 }
 if(disX < -150){
 	i--;
 	for(var q=0;q<lis.length;q++){
  lis[q].className = &#39;&#39;;
  }
  if(i == 1){
 		i=6;
 	}
 	lis[i-2].className= "active" ; 		
 	lb_img.style.left = -320*(Math.round(-disX/320)+i-2) + &#39;px&#39;;
	 	
 }else{
 	lb_img.style.left = -320*(i-1) + "px";
 }
 Time=setInterval(autoplay,2000);
 })
//设置定时器
Time=setInterval(autoplay,2000);
 function autoplay(){
 i++;
 for(var q=0;q<lis.length;q++){
 lis[q].className = &#39;&#39;; 
 }
 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>

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!

JS makes mobile touch carousel effect

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