jQuery实现的自适应焦点图效果完整实例

本文实例讲述了jQuery实现的自适应焦点图效果。分享给大家供大家参考，具体如下：

运行效果截图如下：

具体代码如下：

<!DOCTYPE html>
<html lang="zh-cn">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1,maximum-scale=1, user-scalable=no">
<title>焦点图</title>
<style>
* {
  padding: 0;
  margin: 0;
}
img {
  vertical-align: top;
  border: 0;
}
li {
  list-style: none;
}
#focus-banner {
  position: relative;
  width: 100%;
  overflow: hidden;
}
#focus-banner-list {
  position: relative;
}
#focus-banner-list li {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
}
#focus-banner-list li img {
  width: 100%;
}
.focus-banner-img {
  display: block;
}
#focus-banner-list .focus-banner-text {
  position: absolute;
  left: 50%;
  top: 0;
  width: 1000px;
  height: 100%;
  margin-left: -500px;
  text-align: center;
  color: #fff;
  font-size: 16px;
  text-align: center;
}
#focus-banner .focus-handle {
  position: absolute;
  top: 50%;
  margin-top: -40px;
  z-index: 100;
  display: block;
  width: 80px;
  height: 80px;
  background-image:url(images/focus_handle.png);
}
#next-img {
  left: 0;
}
#next-img {
  left: 50px;
  background-position: 0 0;
}
#next-img:hover {
  background-position: 0 -80px;
}
#prev-img {
  right: 0;
}
#prev-img {
  right: 50px;
  background-position: -80px 0;
}
#prev-img:hover {
  background-position: -80px -80px;
}
#focus-bubble {
  position: absolute;
  left: 50%;
  bottom: 10px;
  z-index: 999;
}
#focus-bubble li {
  float: left;
  width: 10px;
  height: 10px;
  margin: 0 5px;
  border-radius: 50%;
  -webkit-border-radius: 50%;
  -moz-border-radius: 50%;
  -o-border-radius: 50%;
  -ms-border-radius: 50%;
  border: 1px #fff solid;
  cursor: pointer;
}
#focus-bubble li.current {
  background-color: #fff;
}
</style>
</head>
<body>
<div id="focus-banner">
  <ul id="focus-banner-list">
    <li>
      <a href="#" class="focus-banner-img">
        <img src="images/banner2.jpg" alt="">
      </a>
      <div class="focus-banner-text">
        <p>这是一句广告语</p>
      </div>
    </li>
    <li>
      <a href="#" class="focus-banner-img">
        <img src="images/banner3.jpg" alt="">
      </a>
      <div class="focus-banner-text">
        <p>这是二句广告语</p>
      </div>
    </li>
    <li>
      <a href="#" class="focus-banner-img">
        <img src="images/banner4.jpg" alt="">
      </a>
      <div class="focus-banner-text">
        <p>这是三句广告语</p>
      </div>
    </li>
    <li>
      <a href="#" class="focus-banner-img">
        <img src="images/banner5.jpg" alt="">
      </a>
      <div class="focus-banner-text">
        <p>这是四句广告语</p>
      </div>
    </li>
  </ul>
  <a href="javascript:;" id="next-img" class="focus-handle"></a>
  <a href="javascript:;" id="prev-img" class="focus-handle"></a>
  <ul id="focus-bubble"></ul>
</div>
<script src="js/jquery-1.10.1.min.js"></script>
<script>
$(function(){
  var focusBanner=function(){
    var $focusBanner=$("#focus-banner"),
      $bannerList=$("#focus-banner-list li"),
      $focusHandle=$(".focus-handle"),
      $bannerImg=$(".focus-banner-img"),
      $nextBnt=$("#next-img"),
      $prevBnt=$("#prev-img"),
      $focusBubble=$("#focus-bubble"),
      bannerLength=$bannerList.length,
      _index=0,
      _timer="";
    var _height=$(".focus-banner-img").find("img").height();
    $focusBanner.height(_height);
    $bannerImg.height(_height);
    $(window).resize(function(){
      window.location.reload()
    });
    for(var i=0; i<bannerLength; i++){
      $bannerList.eq(i).css("zIndex",bannerLength-i);
      $focusBubble.append("<li></li>");
    }
    $focusBubble.find("li").eq(0).addClass("current");
    var bubbleLength=$focusBubble.find("li").length;
    $focusBubble.css({
      "width":bubbleLength*22,
      "marginLeft":-bubbleLength*11
    });//初始化
    $focusBubble.on("click","li",function(){
      $(this).addClass("current").siblings().removeClass("current");
      _index=$(this).index();
      changeImg(_index);
    });//点击轮换
    $nextBnt.on("click",function(){
      _index++
      if(_index>bannerLength-1){
        _index=0;
      }
      changeImg(_index);
    });//下一张
    $prevBnt.on("click",function(){
      _index--
      if(_index<0){
        _index=bannerLength-1;
      }
      changeImg(_index);
    });//上一张
    function changeImg(_index){
      $bannerList.eq(_index).fadeIn(250);
      $bannerList.eq(_index).siblings().fadeOut(200);
      $focusBubble.find("li").removeClass("current");
      $focusBubble.find("li").eq(_index).addClass("current");
      clearInterval(_timer);
      _timer=setInterval(function(){$nextBnt.click()},5000)
    }//切换主函数
    _timer=setInterval(function(){$nextBnt.click()},5000)
  }();
})
</script>
</body>
</html>

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希望本文所述对大家jQuery程序设计有所帮助。