基于JQuery实现图片轮播效果(焦点图)

基于JQuery实现图片轮播效果(焦点图)_jquery

WBOY

Release： 2016-05-16 15:16:36

Original

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自己写了一个纯jq形式的横向轮播焦点图，可点击小圆点或者左右按钮进行切换，属于定宽类型。改成自适应宽度的也不难，将css里面的bannerCon宽度改为百分比，再在js里面将ul和li的宽度跟随父级容器的宽度变化即可，需要用到$(window).resize。

兼容到IE6+以上浏览器，有轮播速度和切换间隔两个参数可以改。

效果图如下：

Html代码如下：

<html>
<head>
 <meta charset="utf-8">
 <title>banner图</title>
 <link href="css/style.css" rel="stylesheet"/>
 <script src="js/jquery-1.9.1.min.js"></script>
 <script src="js/common.js"></script>
</head>
<body>
 <div class="wrap">
  <div class="banner">
   <div class="bannerCon">
    <ul class="imgList">
     <li><a href="#"><img src="images/banner01.jpg" alt=""/></a></li>
     <li><a href="#"><img src="images/banner02.jpg" alt=""/></a></li>
     <li><a href="#"><img src="images/banner03.jpg" alt=""/></a></li>
    </ul>
    <ul class="btnList clearfix">
     <li class="cur"><span></span></li>
     <li><span></span></li>
     <li><span></span></li>
    </ul>
    <span class="pre-nex prev"><</span> 
    <span class="pre-nex next">></span> 
   </div>
  </div>
 </div>
</body>
</html>

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Css样式如下：

@charset "utf-8";
/* 简单reset */
body, p, ul, ol, li {
  margin: 0;
  padding: 0;
}
ul, ol {
  list-style: none;
}
img { border:none; }
a,button{ outline: none; }
.clearfix:after {
  visibility: hidden;
  display: block;
  font-size: 0;
  content: " ";
  clear: both;
  height: 0;
} 
/* 具体样式 */
.banner {
  position: relative;
  height: 400px;
  overflow: hidden;
}
.banner .bannerCon {
  position: absolute;
  top: 0;
  left: 50%;
  width: 800px;
  height: 400px;
  margin-left: -400px;
  overflow: hidden;
}
.bannerCon .imgList {
  position: absolute;
  top: 0;
  left: 0;
  width: 99999px;
  height: 400px;
}
.bannerCon .imgList li {
  float: left;
  width: 800px;
  height: 400px;
}
.bannerCon .imgList li a {
  position: relative;
  display: block;
  height: 100%;
}
.bannerCon .imgList li img {
  width: 800px;
  height: 400px;
}
.bannerCon .pre-nex {
  display: none;
  position: absolute;
  top: 50%;
  width: 40px;
  height: 60px;
  margin-top: -40px;
  font: bold 40px/60px Simsun;
  color: #ccc;
  text-align: center;
  border:none;
  background: rgba(0,0,0,.30);
  filter:progid:DXImageTransform.Microsoft.Gradient(startColorStr=#4c000000, endColorStr=#4c000000);
  cursor: pointer;
  z-index: 3;
}
.bannerCon .pre-nex.show { display: inline-block; }
.bannerCon .prev { left: 13%; }
.bannerCon .next { right: 13%; }
.bannerCon .btnList {
  position: absolute;
  left: 0;
  bottom: 20px;
  width: 100%;
  height: 12px;
  text-align:center;
  z-index: 2;
  _overflow: hidden;
}
.bannerCon .btnList li { display: inline; }
.bannerCon .btnList li span {
  display: inline-block;
  width: 12px;
  height: 12px;
  margin: 0 5px;
  border-radius: 6px;
  background-color:#14829e;
  cursor: pointer;
}
.bannerCon .btnList li.cur span { background-color: #f30; }

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Js代码如下：

//加载在文本读取之后的js语句 开始 =============================================================
  function Scroll(obj,speed,interval){  //父级容器，轮播速度，切换间隔
    $("."+obj).each(function(){
      var $box = $(this),
      $imgUl = $box.children(".imgList"),
      $imgLi = $imgUl.children("li"),
      $btnUl = $box.children(".btnList"),
      $btnLi = $btnUl.children("li"),
      $btnPreNex = $box.children(".pre-nex"),
      $btnPre = $box.children(".prev"),
      $btnNex = $box.children(".next"),
      n = $imgLi.length,
      width = $imgLi.width(),
      left = parseFloat($imgUl.css("left")),
      k = 0,
      Player;
      $imgUl.css("width",n*width);
      function scroll(){        //轮播事件
        $imgUl.stop().animate({left:-width},speed,function(){
          k += 1;
          $imgUl.css("left",0);
          $imgUl.children("li:first").appendTo($(this));
          $btnLi.removeClass('cur');
          if(k >= n){
            k = 0;
          }
          $btnUl.children("li").eq(k).addClass('cur');      
        });
      }
      $btnLi.click(function(){     //小圆点点击事件
        var index = $btnLi.index(this);  
        $(this).addClass('cur').siblings("li").removeClass('cur');
        if(index >= k){
          var dif = index-k;
          left = -dif*width;
          $imgUl.stop().animate({left:left},speed,function(){
            $imgUl.css("left",0);
            $imgUl.children("li:lt("+dif+")").appendTo($imgUl);  
          });
        }
        else{
          var j = n-(k-index);
          $imgUl.css("left",(index-k)*width);
          $imgUl.children("li:lt("+j+")").appendTo($imgUl);
          $imgUl.stop().animate({left:0},speed);  
        }
        k = index;
      });  
      $btnPreNex.click(function(){   //左右按钮点击事件
        var index = $btnLi.index(this);    
        if($(this).hasClass('next')){
          if(!$imgUl.is(":animated")){
            k += 1;
            $imgUl.animate({left:-width},speed,function(){
              $imgUl.css("left",0);
              $imgUl.children("li:first").appendTo($(this));
              if(k >= n){
                k = 0;
              }
              $btnUl.children("li").removeClass('cur').eq(k).addClass('cur');
            });
          }
        }
        else {
          if(!$imgUl.is(":animated")){
            k += -1;
            $imgUl.css("left",-width);
            $imgUl.children("li:last").prependTo($imgUl);
            $imgUl.stop().animate({left:0},speed);
            if(k < 0){
              k = n-1;
            }
            $btnUl.children("li").removeClass('cur').eq(k).addClass('cur');
          }
        }
      });    
      $box.hover(           //鼠标移入、移出事件
        function(){
          clearInterval(Player);
          $btnPreNex.addClass('show');
        },
        function(){
          Player = setInterval(function(){scroll()},interval);
          $btnPreNex.removeClass('show');
        }
        );
      Player = setInterval(function(){scroll()},interval);
    });
  }  
  $(function () {              //读取轮播事件
    Scroll("bannerCon",600,4000);
  });

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注意加载一下jq库，我用的是1.9.1的，其实1.7+的都没问题的。

以上就是本文的全部内容，希望能够帮助大家。