<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>jQuery实现带左右按钮控制焦点图片切换</title>
<style type="text/css">
*{margin:0;padding:0;}
body{font-size:12px;color:#222;font-family:Verdana,Arial,Helvetica,sans-serif;background:#f0f0f0;}
.clearfix:after{content: ".";display: block;height: 0;clear: both;visibility: hidden;}
.clearfix{zoom:1;}
ul,li{list-style:none;}
img{border:0;}
.wrapper{
width: 800px;
margin: 0 auto;
padding-bottom: 50px;
}
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 .preNext{
width: 45px;
height: 100px;
position: absolute;
top: 90px;
background: url(img/sprite.bmp) no-repeat 0 0;
cursor: pointer;
}
focus .pre{
left: 0;
}
focus .next{
right: 0;
background-position: right top;
}
</style>
<script type="text/javascript" src="js/jquery-1.4.1.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).mouseover(function() {
index = $("#focus .btn span").index(this);
showPics(index);
}).eq(0).trigger("mouseover");
//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);
});
//图片为左右滚动，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
//使用animate()方法调整ul元素滚动到计算出的position
$("#focus ul").stop(true,false).animate({"left":nowLeft},300);
//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);
}
});
</script>
</head>
<body>
<div class="wrapper">
<div id="focus">
<ul>
<li><a href="" target="_blank"><img src="img/01.jpg" alt="" /></a></li>
<li><a href="" target="_blank"><img src="img/02.jpg" alt="" /></a></li>
<li><a href="" target="_blank"><img src="img/03.jpg" alt="" /></a></li>
<li><a href="" target="_blank"><img src="img/04.jpg" alt="" /></a></li>
<li><a href="" target="_blank"><img src="img/05.jpg" alt="" /></a></li>
</ul>
</div>
</div>
</body>
</html>
