一个简单的图片切换特效

如图所示。

该图片切换特效实现很简单，而且兼容性很好。

html页面如下

<div class="wrapper"><div id="focus"><ul><li><a href="http://www.lanrentuku.com/" target="_blank"><img src="img/01.jpg" alt="QQ商城焦点图效果下载" /></a></li><li><a href="http://www.lanrentuku.com/" target="_blank"><img src="img/02.jpg" alt="QQ商城焦点图效果教程" /></a></li><li><a href="http://www.lanrentuku.com/" target="_blank"><img src="img/03.jpg" alt="jquery商城焦点图效果" /></a></li><li><a href="http://www.lanrentuku.com/" target="_blank"><img src="img/04.jpg" alt="jquery商城焦点图代码" /></a></li><li><a href="http://www.lanrentuku.com/" target="_blank"><img src="img/05.jpg" alt="jquery商城焦点图源码" /></a></li></ul></div></div><!-- wrapper end --></body>

css样式

<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;}/* 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>

js脚本

$(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}});

用到的左右切换图片