JS做出移动端触摸轮播效果-js教程-PHP中文网

JS做出移动端触摸轮播效果

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发布： 2018-04-14 09:45:34

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这次给大家带来JS做出移动端触摸轮播效果，JS做出移动端触摸轮播效果的注意事项有哪些，下面就是实战案例，一起来看一下。

下面是移动端手指滑动轮播图的完整代码。

<!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 = ''; 
	 }
	 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);
 })
//设置定时器
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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