jquery版轮播图效果和extend扩展

89443062

2017-07-18

本文实例为大家分享了jquery版本轮播图及extend扩展的具体代码，供大家参考，具体内容如下

具体代码如下

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Document</title>
  <style>
    *{
      margin:0;
      padding:0;
      font-size:14px;
      -webkit-user-select:none;
    }
    ul,li{
      list-style:none;
    }
    img{
      display:block;
      border:none;
    }
    a{
      text-decoration: none;
    }
    .banner{
      position:relative;
      margin:10px auto;
      width:1000px;
      height:300px;
      overflow:hidden;
    }
    .bannerInner{
      width:100%;
      height:100%;
      background:url("../img/default.gif") no-repeat center center;
    }
    .bannerInner div{
      position:absolute;
      top:0;
      left:0;
      z-index:0;
      width:100%;
      height:100%;
      opacity: 0;
      filter:alpha(opacity=0);
    }
    .bannerInner div img{
      display:none;
      width:100%;
      height:100%;
    }
    .banner .bannerTip{
      position:absolute;
      right:20px;
      bottom:20px;
      z-index:10;
      overflow:hidden;
    }
    .banner .bannerTip li{
      float:left;
      margin-left:10px;
      width:18px;
      height:18px;
      background:lightblue;
      border-radius:50%;
      cursor:pointer;
    }
    .banner .bannerTip li.bg{
      background:orange;
    }
    .banner a{
      display:none;
      position:absolute;
      top:50%;
      margin-top:-22.5px;
      z-index:10;
      width:30px;
      height:45px;
      opacity: 0.5;
      filter:alpha(opacity=50);
      background-image:url('../img/pre.png');

    }
    .banner a.bannerLeft{
      left:20px;
      background-position:0 0;
    }
    .banner a.bannerRight{
      right:20px;
      background-position:-50px 0;
    }
    .banner a:hover{
      opacity: 1;
      filter:alpha(opacity=100);
    }
  </style>
</head>
<body>
  <div class='banner' id='bannerFir'>
    <div class='bannerInner'>
      <div><img src="" alt="" trueImg='img/banner1.jpg'></div>
      <div><img src="" alt="" trueImg='img/banner2.jpg'></div>
      <div><img src="" alt="" trueImg='img/banner3.jpg'></div>
      <div><img src="" alt="" trueImg='img/banner4.jpg'></div>
    </div>
    <ul class='bannerTip'>
      <li class='bg'></li>
      <li></li>
      <li></li>
      <li></li>
    </ul>
    <a href="javascript:;" rel="external nofollow" rel="external nofollow" class='bannerLeft'></a>
    <a href="javascript:;" rel="external nofollow" rel="external nofollow" class='bannerRight'></a>
  </div>

  <script>
    jQuery.fn.extend({
      banner:myBanner
    })
    //通过jQuery选择器或者筛选的方法获取到的jQuery集合是不存在dom映射机制的，之前获取到的dom集合，之后再页面中HTML结构改变了，集合中的内容不会跟着自动发生变化（JS获取的元素集合有DOM映射的机制）
    function myBanner(selector,ajaxURL,interval){
      var $banner = $("#"+selector);
      var $bannerInner = $banner.children(".bannerInner"),$divList = null,$imgList = null;
      var $bannerTip = $banner.children(".bannerTip"),$oLis = null
      var $bannerLeft = $banner.children(".bannerLeft"),$bannerRight = $banner.children(".bannerRight")

      //1、Ajax读取数据
      var jsonData = null;
      $.ajax({
        url:ajaxURL+"?_="+Math.random(),
        type:'get',
        dataType::"json",
        async:false,//当前的请求是同步的
        success:function(data){
          jsonData = data;

        }
      })
      //2、实现数据的绑定
      function bindData(){
        var str = "",str2 = "";
        if(jsonData){
          //原生的jsonData使用$.each()
          $.each(jsonData,function(index,item){
            str+='<div><img src="" alt="" trueImg="'+item["img"]+'"></div>';
            index===0?str2+='<li class="bg"></li>':str2+='<li></li>'
          })

          $bannerInner.html(str);
          $bannerTip.html(str2);
          $divList = $bannerInner.children("div")
          $imgList = $bannerInner.find('img')
          $oLis = $bannerTip.children("li")
        }
      }
      //3、实现图片的延迟加载
      window.setTimeout(lazyImg,500);
      function lazyImg(){
        //jquery元素集合 直接写$imgList.each()
        $imgList.each(function(index,item){
          var _this = this;
          var oImg = new Image;
          oImg.src = $(this).attr("trueImg");//$(this)等价于$(item)
          oImg.onload = function(){
            $(_this).prop('src',this.src).css("display","block")//内置属性使用prop
          }
        })
        $divList.eq(0).css("zIndex",1).animate({opacity:1},300);
      }
      //封装一个轮播图切换的效果
      function changeBanner(){
        var $curDiv = $divList.eq(step);
        $curDiv.css("zIndex",1).siblings().css("zIndex",0);
        $curDiv.animate({opacity:1},300,function(){
          $(this).siblings().css("opacity",0)
        })
        $oLis.eq(step).addClass("bg").siblings().removeClass('bg')
      }
      //4、实现自动轮播
      interval = interval || 3000;
      var step = 0,autoTimer = null;
      autoTimer = window.setInterval(autoMove,interval)
      function autoMove(){
        if(step === jsonData.length-1){
          step = -1;
        }
        step++;
        changeBanner();
      }
      //5、控制左右按钮的显示隐藏和自动轮播的开始和暂停
      $banner.on('mouseover',function(){
        window.clearInterval(autoTimer);
        $bannerLeft.css("display","block")
        $bannerRight.css("display","block")
      }).on('mouseout',function(){
        autoTimer = window.setInterval(autoMove,interval);
        $bannerLeft.css("display","none")
        $bannerRight.css("display","none")

      })
      //6、实现焦点切换
      $oLis.on('click',function(){
        step = $(this).index();
        changeBanner();
      })

      //7、实现左右切换
      $bannerRight.on('click',autoMove);
      $bannerLeft.on('click',function(){
        if(step===0){
          step = jsonData.length;
        }
        step--;
        changeBanner();
      });

    }


    //外部使用
    $().banner("bannerFir","json/banner.txt",1000)
  </script>
</body>
</html>

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