<!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=gb2312" />
<title>图片切换效果</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:730px; 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:730px; height:250px; overflow:hidden; position:relative;}
#focus ul {height:380px; position:absolute;}
#focus ul li {float:left; width:730px; height:250px; overflow:hidden; position:relative; background:#000;}
#focus ul li div {position:absolute; overflow:hidden;}
#focus .btnBg {position:absolute; width:730px; height:20px; left:0; bottom:0; background:#000;}
#focus .btn {position:absolute; width:730px; 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>
<script type="text/javascript" src="js/jquery.min.js"></script>
<script type="text/javascript">
$(function() {
var sHeight = $("#focus").height(); //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("height",sHeight * (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 nowHeight = -index*sHeight; //根据index值计算ul元素的left值
$("#focus ul").stop(true,false).animate({"top":nowHeight},300); //通过animate()调整ul元素滚动到计算出的position
//$("#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">
<Br>
<br>
<div id="focus">
<ul>
<li><a href="#" target="_blank"><img src="img/flash_01.jpg" alt="美食通知" /></a></li>
<li><a href="#" target="_blank"><img src="img/flash_02.jpg" width="730px" alt="美食通知" /></a></li>
<li><a href="#" target="_blank"><img src="img/flash_03.jpg" width="730px" alt="美食通知" /></a></li>
</ul>
</div>
</div>
</body>
</html>
