jquery实现焦点轮播效果

勤勤学长的csdn

2017-02-23

HTML代码

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>Title</title>
 <link rel="stylesheet" href="./css/lunbo.css" rel="external nofollow" >
</head>
<body>
 <div id="banner">
  <ul class="img-ul"></ul>
  <ol class="index-ol"></ol>
 <div class="slide">
  <span class="prev"><</span>
  <span class="next">></span>
 </div>
 </div>
<script src="./js/jquery-1.11.3.js"></script>
<script src="./js/lunbo.js"></script>
</body>
</html>

css代码

div {
 width: 670px;
 height: 240px;
 position: relative;
 overflow: hidden;
}
div > ul,
div ol {
 list-style: none;
 position: absolute;
 margin: 0;
 padding: 0;
}
div > ul.img-ul,
div ol.img-ul {
 width: 3350px;
 height: 240px;
 z-index: 100;
}
div > ul.img-ul > li,
div ol.img-ul > li {
 float: left;
 width: 670px;
 height: 240px;
}
div > ul.index-ol,
div ol.index-ol {
 width: 205px;
 bottom: 10px;
 left: 217px;
 z-index: 1000;
}
div > ul.index-ol > li,
div ol.index-ol > li {
 float: left;
 cursor: pointer;
 margin-left: 20px;
 background: #000;
 color: #fff;
 border-radius: 50%;
 height: 20px;
 width: 20px;
 text-align: center;
 line-height: 20px;
}
div > ul.index-ol > li.active,
div ol.index-ol > li.active {
 background: red;
}
div > div.slide {
 z-index: 500;
 position: absolute;
 width: 670px;
 height: 240px;
 left: 0;
 top: 0;
}
div > div.slide > span {
 cursor: pointer;
 position: absolute;
 top: 100px;
 width: 30px;
 height: 60px;
 line-height: 60px;
 text-align: center;
 font-size: 20px;
 color: #fff;
 background: rgba(0, 0, 0, 0.2);
}
div > div.slide > span:nth-child(1) {
 left: 0;
}
div > div.slide > span:nth-child(2) {
 right: 0;
}

JavaScript代码

var arr=[
 {"img":"./images/banner_01.jpg"},
 {"img":"./images/banner_02.jpg"},
 {"img":"./images/banner_03.jpg"},
 {"img":"./images/banner_04.jpg"},
 {"img":"./images/banner_05.jpg"},
 ];
var lunbo={
 can:0, //判断
 ul_li:"",//图片列表
 ol_li:"",//数字列表
 width:"",//一个li的宽度
 interval:"",//定时器
 init:function(){
 console.log(this);
 this.view();
 this.view_index();
 $("ol.index-ol").children("li:eq(0)").addClass("active");
 this.width=$("ul.img-ul>li").width(); //670
 this.slide(); //这是左右箭头
 this.animation_index();//这是下标
 this.play(); //这是自动轮播
 this.mouse(); //这是鼠标滑入/滑出
 },
 mouse:function(){
 var _this=this;
 $("#banner").on({
  mouseenter:function(){
  _this.stop()
  },
  mouseleave:function(){
  _this.play();
  }
 })
 },
 play:function(){
 this.interval=setInterval(function(){
  var active_index= parseInt($("ol.index-ol>li.active").attr("data-index"));//得到当前激活向下标
  $("ol.index-ol>li").removeClass("active");
  $(this).addClass("active");
  this.animation(1);
  (active_index==4)&&(active_index=-1);
  $("ol.index-ol>li:eq("+(active_index+1)+")").addClass("active")
 }.bind(this),3000);
 },
 stop:function(){
 clearInterval(this.interval)
 this.interval=null;
 },
 animation_index:function(){//更新下标
 var _this=this;
 $("ol.index-ol>li").mouseenter(function(){//点击下标
  var active_index= $("ol.index-ol>li.active").attr("data-index");//得到当前激活向下标
  var index=$(this).attr("data-index");//得到当前下标;
  if(active_index==index){return;};
  $("ol.index-ol>li").removeClass("active");
  $(this).addClass("active");
  var end=index-active_index;
  _this.animation(-end)
 })
 },
 slide:function(){//点击左右箭头
 var _this=this;
 $("div.slide>span").click(function(){
  if(_this.can){return;};
  var active_index= parseInt($("ol.index-ol>li.active").attr("data-index"));//得到当前激活向下标
  $("ol.index-ol>li").removeClass("active");
  if(this.className=="prev"){
  _this.animation(1);
  (active_index==1)&&(active_index=5);
  $("ol.index-ol>li:eq("+(active_index-1)+")").addClass("active")
  }else{
  _this.animation(-1);
  (active_index==4)&&(active_index=-1);
  $("ol.index-ol>li:eq("+(active_index+1)+")").addClass("active")
  }
 })
 },
 view:function(){//更新图片
 for(var i=0;i<arr.length;i++){
  this.ul_li+="<li data-index="+i+"><img src="+arr[i].img+"></li>"
 }
 $("ul.img-ul").html(this.ul_li);
 this.ul_li="";
 },
 view_index:function(){//更新数字
 for(var i=0;i<arr.length;i++){
  this.ol_li+="<li data-index="+i+">"+(i+1)+"</li>"
 }
 $("ol.index-ol").html(this.ol_li);
 },
 animation:function(n){//做动画
 this.can=1;
 if(n<0){
  arr=arr.splice(arr.length+n,-n).concat(arr);
  this.view();
  $("ul.img-ul").css({"left":n*this.width+"px"});
  $("ul.img-ul").animate({"left":"0px"},1000,function(){
  this.can=0;
  }.bind(this));
 }else{
  $("ul.img-ul").animate({"left":-n*this.width+"px"},1000,function(){
  arr=arr.concat(arr.splice(0,n));
  this.view();
  $("ul.img-ul").css({"left":0+"px"});
  this.can=0;
  }.bind(this));
 }
 }
};
lunbo.init();

轮播 jquery