Although I downloaded some focus map codes from the Internet to study, I still don't understand them well. Can any experts give me some formulas? _html/css_WEB-ITnose

nbsp;html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script></script>
<script> <br /> $(function() { <br /> var sWidth = $("#focus").width(); //获取焦点图的宽度（显示面积） <br /> var len = $("#focus ul li").length; //获取焦点图个数 <br /> var index = 0; <br /> var picTimer; <br /> <br /> //以下代码添加数字按钮和按钮后的半透明长条 <br /> var btn = "<div class='btnBg'><div class='btn'>"; <br /> for(var i=0; i < len; i++) { <br /> btn += "<span>" + (i+1) + ""; <br /> } <br /> btn += "" <br /> $("#focus").append(btn); <br /> $("#focus .btnBg").css("opacity",0.5); <br /> <br /> //为数字按钮添加鼠标滑入事件，以显示相应的内容 <br /> $("#focus .btn span").mouseenter(function() { <br /> index = $("#focus .btn span").index(this); <br /> showPics(index); <br /> }).eq(0).trigger("mouseenter"); <br /> <br /> //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 <br /> $("#focus ul").css("width",sWidth * (len + 1)); <br /> <br /> //鼠标滑入某li中的某div里，调整其同辈div元素的透明度，由于li的背景为黑色，所以会有变暗的效果 <br /> $("#focus ul li div").hover(function() { <br /> $(this).siblings().css("opacity",0.7); <br /> },function() { <br /> $("#focus ul li div").css("opacity",1); <br /> }); <br /> <br /> //鼠标滑上焦点图时停止自动播放，滑出时开始自动播放 <br /> $("#focus").hover(function() { <br /> clearInterval(picTimer); <br /> },function() { <br /> picTimer = setInterval(function() { <br /> if(index == len) { //如果索引值等于li元素个数，说明最后一张图播放完毕，接下来要显示第一张图，即调用showFirPic()，然后将索引值清零 <br /> showFirPic(); <br /> index = 0; <br /> } else { //如果索引值不等于li元素个数，按普通状态切换，调用showPics() <br /> showPics(index); <br /> } <br /> index++; <br /> },3000); //此3000代表自动播放的间隔，单位：毫秒 <br /> }).trigger("mouseleave"); <br /> <br /> //显示图片函数，根据接收的index值显示相应的内容 <br /> function showPics(index) { //普通切换 <br /> var nowLeft = -index*sWidth; //根据index值计算ul元素的left值 <br /> $("#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 <br /> $("#focus .btn span").removeClass("on").eq(index).addClass("on"); //为当前的按钮切换到选中的效果 <br /> } <br /> <br /> function showFirPic() { //最后一张图自动切换到第一张图时专用 <br /> $("#focus ul").append($("#focus ul li:first").clone()); <br /> var nowLeft = -len*sWidth; //通过li元素个数计算ul元素的left值，也就是最后一个li元素的右边 <br /> $("#focus ul").stop(true,false).animate({"left":nowLeft},500,function() { <br /> //通过callback，在动画结束后把ul元素重新定位到起点，然后删除最后一个复制过去的元素 <br /> $("#focus ul").css("left","0"); <br /> $("#focus ul li:last").remove(); <br /> }); <br /> $("#focus .btn span").removeClass("on").eq(0).addClass("on"); //为第一个按钮添加选中的效果 <br /> } <br /> }); <br /> <br /> </script>

jQuery淘宝商城多格焦点图效果

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说明：

来源：淘宝商城  代码整理：54173BLOG  首发：懒人图库

＊尊重他人劳动成果，转载请自觉注明出处！注：此代码仅供学习交流，请勿用于商业用途。

{download}

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I downloaded this code online and can only understand the following parts of , Although some of the above have comments and are very clear, but what I know more is, how to understand these codes? Or should I just memorize it by rote?

Reply to discussion (solution)

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:600px; margin:0 auto; padding-bottom:50px;}
.ad {width:468px; margin:10px auto 0;}
.ad li {padding-top:5px;}

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;}

.wrapper {width:780px;}
/* tmall focus */
#focus {width:780px; height:380px; overflow:hidden; position:relative;}
#focus ul {height:380px; position:absolute;}
#focus ul li {float :left; width:780px; height:380px; overflow:hidden; position:relative; background:#000;}
#focus ul li div {position:absolute; overflow:hidden;}
#focus .btnBg {position:absolute; width:780px; height:40px; left:0; bottom:0; background:#000;}
#focus .btn {position:absolute; width:770px; height:24px; left:0 ; bottom:8px; padding-left:10px;}
#focus .btn span {display:inline-block; _display:inline; _zoom:1; width:24px; height:24px; line-height:24px; text -align:center; font-size:20px; font-family:"Microsoft YaHei",SimHei; margin-right:10px; cursor:pointer; color:#fff;}
#focus .btn span.on {background :#000; color:#fcc;}

is the special effect of JavaScript.
The example you posted quoted the js library--jquery.
The poster can learn from it
http://www.w3school.com.cn/jquery/index.asp

Thank you for your help, the website explains it in detail!