基于Jquery实现焦点图淡出淡入效果

 
 
 
 
 


 

  

   

    
    

     

     

     

    
    

     

     

     

    
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@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 { height: 400px; }
.banner .bannerCon {
  position: relative;
  width: 60%;
  height: 100%;
  margin: 0 auto;
  overflow: hidden;
}
.bannerCon .imgList {
  width: 100%;
  height: 100%;
}
.bannerCon .imgList li {
  display: none;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: #e2f6fd; /* 这个背景是为了展示宽度大于图片宽度时的区域，可以删除 */
  z-index: 1;
}
.bannerCon .imgList li a {
  display: block;
  height: 100%;
  text-align: center;
}
.imgList li a img {
  position: absolute;
  top: 0;
  left: 50%;
  margin-left: -400px; /* 这个数值填图片的实际宽度的一半 */
}
.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: 6;
  _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; }

//加载在文本读取之后的js语句 开始 =============================================================
  function fadeImg(obj,speed,interval){  //父级容器，淡出淡入速度，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"),
        n = $imgLi.length,
        k = 0,
        Player = setInterval(function(){fade()},interval);
      $imgLi.eq(0).fadeIn(speed);             //第一张先淡入
      function fade(){                  //淡出淡入事件
        k += 1;
        if(k >= n){
          k = 0;
        }
        $btnLi.removeClass('cur').eq(k).addClass('cur');
        $imgLi.fadeOut(speed).eq(k).fadeIn(speed);  
      };
      $btnLi.click(function(){              //小圆点点击事件
        var index = $btnLi.index(this);
        $(this).addClass('cur').siblings('li').removeClass('cur');
        $imgLi.fadeOut(speed).eq(index).fadeIn(speed);
        k = index;
      });     
      $btnPreNex.click(function(){            //左右按钮点击事件              
        if(!$imgLi.is(":animated")){
          if($(this).hasClass('next')){
            k += 1;
            if(k >= n){
              k = 0;
            }
          }
          else{
            k += -1;
            if(k <0){
              k = n-1;
            }
          }
          $btnLi.removeClass('cur').eq(k).addClass('cur');
          $imgLi.fadeOut(speed).eq(k).fadeIn(speed);
        }  
      });   
      $box.hover(                      //鼠标移入事件（不用toggle是为了兼容1.9+的JQ库）  
        function(){
          clearInterval(Player);
          $btnPreNex.addClass('show');
        },
        function(){
          Player = setInterval(function(){fade()},interval);
          $btnPreNex.removeClass('show');
        }
      );        
    });
  }  
  $(function () {              //读取轮播事件
    fadeImg("bannerCon",1000,3000);
  });