jquery实现图片左右切换,js 图片切换的实现方法
jquery实现图片左右切换完整代码如下：
<!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实现图片左右切换,图片切换js的实现方法</title>
<script type="text/javascript" src="http://www.jsjtt.com/skin/jsjtt/js/jquery-1.7.1.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 currentIndex = 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").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);
});
//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() {
index++;
if(index == len) {index = 0;}
showPics(index);
},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
//console.info('index:' + index);
var nowLeft = -index*sWidth; //根据index值计算ul元素的left值
$("#focus>ul").stop(true,false).animate({"left":nowLeft},500); //通过animate()调整ul元素滚动到计算出的position
$("#focus .btn span").stop(true,false).removeClass("on").eq(index).stop(true,false).addClass("on");
currentIndex = index;
}
});
</script>
</head>
<body>
<div class="imgSel" id="imgSel">
<div id="focus">
<ul>
<li><div class="img"><img src="http://www.jsjtt.com/d/file/webkaifa/jquery/2012-12-10/fd10f4eeff5be7cb2f37b8b4c5a46222.jpg" /></div></li>
<li><div><img src="http://www.jsjtt.com/d/file/webkaifa/jquery/2012-12-10/9b311f8de466e028cdf155969ea38a2d.jpg" /></div></li>
</ul>
</div>
<!--focus end--></div>
</body>
<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;}
h1{height:50px;line-height:50px;font-size:22px;font-weight:normal;font-family:"Microsoft YaHei",SimHei;margin-bottom:20px;}
/* 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(http://www.jsjtt.com/d/file/webkaifa/jquery/2012-12-10/765edb044a41b1e30d1fe5177334fb87.png) no-repeat 0 0;cursor:pointer;}
#focus .pre{left:0;}
#focus .next{right:0;background-position:right top;}
</style>
</html>
来源：//作者：/更新时间：2012-12-10
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