JQuery 实现图片切换

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<html xmlns="http://www.w3.org/1999/xhtml">
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<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>QQ商城jQuery焦点图效果_懒人图库</title>
<meta name="keywords" content="JS代码,焦点图,jquery特效,jquery焦点图,jquery图片轮换,jquery相册效果,jquery焦点图效果,焦点图实例,淘宝焦点图代码下载,JS广告代码,JS特效代码" />
<meta name="description" content="此代码内容为QQ商城jQuery焦点图效果，属于站长常用代码，更多焦点图代码请访问懒人图库JS代码频道。" />

.wrapper {width:800px; margin:0 auto; padding-bottom:50px;}

h1 {height:50px; line-height:50px; font-size:22px; font-weight:normal; font-family:"Microsoft YaHei",SimHei;}

.shuoming {margin-top:20px; border:1px solid #ccc; padding-bottom:10px;}
.shuoming dt {height:30px; line-height:30px; font-weight:bold; text-indent:10px;}
.shuoming dd {line-height:20px; padding:5px 20px;}

/* qqshop focus */
#focus {width:800px; height:280px; overflow:hidden; position:relative;}
#focus ul {height:380px; position:absolute;}
#focus ul li {float:left; width:800px; height:280px; overflow:hidden; position:relative; background:#000;}
#focus ul li div {position:absolute; overflow:hidden;}
#focus .btnBg {position:absolute; width:800px; height:20px; left:0; bottom:0; background:#000;}
#focus .btn {position:absolute; width:780px; height:10px; padding:5px 10px; right:0; bottom:0; text-align:right;}
#focus .btn span {display:inline-block; _display:inline; _zoom:1; width:25px; height:10px; _font-size:0; margin-left:5px; cursor:pointer; background:#fff;}
#focus .btn span.on {background:#fff;}
#focus .preNext {width:45px; height:100px; position:absolute; top:90px; background:url(img/sprite.png) no-repeat 0 0; cursor:pointer;}
#focus .pre {left:0;}
#focus .next {right:0; background-position:right top;}
</style>

//为小按钮添加鼠标滑入事件，以显示相应的内容
$("#focus .btn span").css("opacity",0.4).mouseenter(function() {
index = $("#focus .btn span").index(this);
showPics(index);
}).eq(0).trigger("mouseenter");

//上一页、下一页按钮透明度处理
$("#focus .preNext").css("opacity",0.2).hover(function() {
$(this).stop(true,false).animate({"opacity":"0.5"},300);
},function() {
$(this).stop(true,false).animate({"opacity":"0.2"},300);
});

//上一页按钮
$("#focus .pre").click(function() {
  index -= 1;
  if(index == -1) {index = len - 1;}
  showPics(index);
});

//下一页按钮
$("#focus .next").click(function() {
  index += 1;
  if(index == len) {index = 0;}
  showPics(index);
});

//本例为左右滚动，即所有li元素都是在同一排向左浮动，所以这里需要计算出外围ul元素的宽度
$("#focus ul").css("width",sWidth * (len));

//鼠标滑上焦点图时停止自动播放，滑出时开始自动播放
$("#focus").hover(function() {
  clearInterval(picTimer);
},function() {
  picTimer = setInterval(function() {
   showPics(index);
   index++;
   if(index == len) {index = 0;}
  },4000); //此4000代表自动播放的间隔，单位：毫秒
}).trigger("mouseleave");

//显示图片函数，根据接收的index值显示相应的内容
function showPics(index) { //普通切换
  var nowLeft = -index*sWidth; //根据index值计算ul元素的left值
  $("#focus ul").stop(true,false).animate({"left":nowLeft},300); //通过animate()调整ul元素滚动到计算出的position
  //$("#focus .btn span").removeClass("on").eq(index).addClass("on"); //为当前的按钮切换到选中的效果
  $("#focus .btn span").stop(true,false).animate({"opacity":"0.4"},300).eq(index).stop(true,false).animate({"opacity":"1"},300); //为当前的按钮切换到选中的效果
}
});

</script>
</head>

<body>
<div class="wrapper">
<h1>jQuery2012QQ商城焦点图效果</h1>

<dl class="shuoming">
  <dt>说明：</dt>
  <dd>来源：<a href="http://shop.qq.com" target="_blank">QQ商城</a> 代码整理：<a href="http://www.54173.cn/blog/?p=539" target="_blank">54173BLOG</a> 首发：<a href="http://www.lanrentuku.com/" target="_blank">懒人图库</a></dd>
  <dd>＊尊重他人劳动成果，转载请自觉注明出处！注：此代码仅供学习交流，请勿用于商业用途。</dd>
  <dd><a href="http://www.lanrentuku.com/js/d860.zip"><img border="0" src="/images/js_freedown.gif" /></a></dd>
  <dd><p>使用简单的“焦点图万能结构”，网站后台调用零压力，其它功能代码均由jquery生成，懒人图库推荐下载！！</p></dd>
  <dd><script src="/goto/js-preview-728x90.js"></script><center style="display:none"><script src="/js/tj.js"></script></center></dd>
</dl>

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