js原生实现移动端手指滑动轮播图效果的示例
时间：2021-06-23 09:21:33|栏目：JavaScript代码|点击： 次
如下所示：
<!DOCTYPE html>
<html lang="en">
<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">
<title>Document</title>
</head>
<style>
html{height:100%;}
body{width: 100%;height:100%;margin:0;overflow: hidden;}
.wrap{position: relative;overflow: hidden;}
.box{position: absolute;list-style: none;left:0;top:0;padding:0;margin:0;}
.box li{float:left;}
.box{
position: relative;
height: 2000px;
width: 100%;
top: 0;
bottom: 0;
left: 0;
right: 0;
background: red;
}
.box1{
height: 2000px;
}
.box2{
background: yellow;
}
.box3{
background: yellowgreen;
}
.box4{
background: orange;
}
.box5{
background: cyan;
}
</style>
<body>
<div class="wrap">
<ul class="box">
<li><div class="box1 box2">11111</div></li>
<li><div class="box1 box3">2222</div></li>
<li><div class="box1 box4">3333</div></li>
<li><div class="box1 box5">4444</div></li>
</ul>
</div>
<script>
var aLi = document.querySelectorAll(".box li");
var box = document.querySelector('.box');
var wrap = document.querySelector('.wrap');
var aLiWidth = box.offsetWidth;
console.log('aLiWidth: ' + aLiWidth)
wrap.style.height = aLi[0].offsetHeight + 'px';
// 设置盒子的宽度
box.style.width = aLi.length*100 + '%';
for(var i=0;i<aLi.length;i++){
aLi[i].style.width = 1/aLi.length * 100 + '%';
};
// 初始化手指坐标点
var startPoint = 0;
var startEle = 0;
//手指按下
wrap.addEventListener("touchstart",function(e){
startPoint = e.changedTouches[0].pageX;
startEle = box.offsetLeft;
});
//手指滑动
wrap.addEventListener("touchmove",function(e){
var currPoint = e.changedTouches[0].pageX;
var disX = currPoint - startPoint;
var left = startEle + disX;
box.style.left = left + 'px';
});
//当手指抬起的时候，判断图片滚动离左右的距离，当
wrap.addEventListener("touchend",function(e){
var left = box.offsetLeft;
// 判断正在滚动的图片距离左右图片的远近，以及是否为最后一张或者第一张
var currNum = Math.round(-left/aLiWidth);
currNum = currNum>=(aLi.length-1) ? aLi.length-1 : currNum;
currNum = currNum<=0 ? 0 : currNum;
box.style.left = -currNum*wrap.offsetWidth + 'px';
})
</script>
</body>
</html>
