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Example of JS implementation of image carousel

小云云
小云云Original
2018-02-12 09:04:091460browse

This article mainly brings you an example of using JS to implement image carousel (the front and back are connected end to end). The code refers to someone who has already written the image carousel function (thank you again), but there is no end to end connection. On this basis, I added the end-to-end connection function.

The effect is as follows:


##

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
 <title>图片轮播</title>
 <style type="text/css">
 body,p,ul,li,a,img{margin: 0;padding: 0;}
 ul,li{list-style: none;}
 a{text-decoration: none;}
 #wrapper{
  position: relative;
  margin: 30px auto; /* 上下边距30px，水平居中 */
  width: 400px;
  height: 200px;
 }
 #banner{
  position:relative;
  width: 400px;
  height: 200px;
  overflow: hidden;
 }
 .imgList{
  position:relative;
  width:2000px;
  height:200px;
  z-index: 10;
  overflow: hidden;
 }
 .imgList li{float:left;display: inline;}
 #prev,
 #next{
  position: absolute;
  top:80px;
  z-index: 20;
  cursor: pointer;
  opacity: 0.2;
  filter:alpha(opacity=20);
 }
 #prev{left: 10px;}
 #next{right: 10px;}
 #prev:hover,
 #next:hover{opacity: 0.5;filter:alpha(opacity=50);}

</style>
</head>
<body>
 <p id="wrapper"><!-- 最外层部分 -->
 <p id="banner"><!-- 轮播部分 -->
  <ul class="imgList"><!-- 图片部分 -->
  <li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><img src="./img/1.jpg" width="400px" height="200px" alt="1"></a></li>
  <li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><img src="./img/2.jpg" width="400px" height="200px" alt="2"></a></li>
  <li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><img src="./img/3.jpg" width="400px" height="200px" alt="3"></a></li>
  <li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><img src="./img/4.jpg" width="400px" height="200px" alt="4"></a></li>
  <li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><img src="./img/5.jpg" width="400px" height="200px" alt="5"></a></li>
 </ul>
 <img src="./img/prev.png" width="40px" height="40px" id="prev">
 <img src="./img/next.png" width="40px" height="40px" id="next">
</p>
</p>
<script type="text/javascript" src="./js/jquery-3.2.1.min.js"></script>
<script type="text/javascript">
var curIndex = 0, //当前index
 imgLen = $(".imgList li").length; //图片总数
$(".imgList").css("width", (imgLen+1)*400+"px");
// 定时器自动变换3秒每次
var autoChange = setInterval(function(){
 if(curIndex < imgLen-1){
  curIndex ++;
 }else{
  curIndex = 0;
 }
 //调用变换处理函数
 changeTo(curIndex);
},3000);

//左箭头滑入滑出事件处理
$("#prev").hover(function(){
 //滑入清除定时器
 clearInterval(autoChange);
}, function(){
 //滑出则重置定时器
 autoChangeAgain();
});

//左箭头点击处理
$("#prev").click(function(){
 //根据curIndex进行上一个图片处理
 // curIndex = (curIndex > 0) ? (--curIndex) : (imgLen - 1);
 if (curIndex == 0) {
  var element = document.createElement("li");
  element.innerHTML = $(".imgList li")[imgLen - 1].innerHTML;
  // $(".imgList li")[imgLen - 1].remove();
  $(".imgList").prepend(element);
  $(".imgList").css("left", -1*400+"px");
  changeTo(curIndex);
  curIndex = -1;
 } else if (curIndex == -1) {
  $(".imgList").css("left", -(imgLen-1)*400+"px");
  curIndex = imgLen-2;
  $(".imgList li")[0].remove();
  changeTo(curIndex);
 } else {
  --curIndex;
  changeTo(curIndex);
 }

});

//右箭头滑入滑出事件处理
$("#next").hover(function(){
 //滑入清除定时器
 clearInterval(autoChange);
}, function(){
 //滑出则重置定时器
 autoChangeAgain();
});
//右箭头点击处理
$("#next").click(function(){
 // curIndex = (curIndex < imgLen - 1) ? (++curIndex) : 0;
 console.log(imgLen);
 if (curIndex == imgLen-1) {
  var element = document.createElement("li");
  element.innerHTML = $(".imgList li")[0].innerHTML;
  // $(".imgList li")[0].remove();
  $(".imgList").append(element);
  ++curIndex;
 } else if (curIndex == imgLen) {
  curIndex = 0;
  $(".imgList").css("left", "0px");
  $(".imgList li")[imgLen].remove();
  curIndex++;
 } else {
  ++curIndex;
 }
 changeTo(curIndex);
});

//清除定时器时候的重置定时器--封装
function autoChangeAgain(){
 autoChange = setInterval(function(){
  if(curIndex < imgLen-1){
   curIndex ++;
  }else{
   curIndex = 0;
  }
 //调用变换处理函数
 changeTo(curIndex);
 },3000);
}


function changeTo(num){
 var goLeft = num * 400;
 $(".imgList").animate({left: "-" + goLeft + "px"},500);
}
</script>
</body>
</html>

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