代码如下：
<style type="text/css">
#focus {
width:950px;
height:280px;
overflow:hidden;
position:relative;
}
#focus ul {
height:280px;
position:absolute;
}
#focus ul li {
float:left;
width:950px;
height:280px;
overflow:hidden;
position:relative;
background:#000;
}
#focus ul li div {
position:absolute;
overflow:hidden;
}
#focus .btnBg {
position:absolute;
width:950px;
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(http://www.580350.com/p/gg/lunhuan/sprite.png) no-repeat 0 0;
cursor:pointer;
}
#focus .pre {
left:0;
}
#focus .next {
right:0;
background-position:right top;
}
</style>
<script type="text/javascript" src="http://www.580350.com/p/gg/lunhuan/jquery.min.js"></script>
<script type="text/javascript">
$(function() {
var sWidth = $("#focus").width(); //获取焦点图的宽度（显示面积）
var len = $("#focus ul li").length; //获取焦点图个数
var index = 0;
var picTimer;
//以下代码添加数字按钮和按钮后的半透明条，还有上一页、下一页两个按钮
var btn = "<div class='btnBg'></div><div class='btn'>";
for(var i=0; i < len; i++) {
btn += "<span></span>";
}
btn += "</div><div class='preNext pre'></div><div class='preNext next'></div>";
$("#focus").append(btn);
$("#focus .btnBg").css("opacity",0.5);
//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>
<div id="focus">
<ul>
<li><a target="_blank" href="http://www.580350.com/"><img alt="" src="http://www.580350.com/p/gg/lunhuan/01.jpg" /></a></li>
<li><a target="_blank" href="http://www.580350.com/"><img alt="" src="http://www.580350.com/p/gg/lunhuan/02.jpg" /></a></li>
<li><a target="_blank" href="http://www.580350.com/"><img alt="" src="http://www.580350.com/p/gg/lunhuan/03.jpg" /></a></li>
<li><a target="_blank" href="http://www.580350.com/"><img alt="" src="http://www.580350.com/p/gg/lunhuan/04.jpg" /></a></li>
<li><a target="_blank" href="http://www.580350.com/"><img alt="" src="http://www.580350.com/p/gg/lunhuan/05.jpg" /></a></li>
</ul>
</div>
