一款双向无缝+按钮定位的焦点图实现代码

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<html xmlns="http://www.w3.org/1999/xhtml"> 
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 
<title>myFocus - tbhuabao</title> 
<style type="text/css"> 
*{margin:0;padding:0;border:0;list-style:none;} 
body{background:#fff;padding:20px;} 
/*=========mF_tbhuabao========*/ 
.mF_tbhuabao {background:#ddd;border:10px solid #333;overflow:visible;} 
.mF_tbhuabao .pic,.mF_tbhuabao .win{position:absolute;top:0;left:0;overflow:hidden;} 
.mF_tbhuabao .pic li{position:relative;float:left;overflow:hidden;} 
.mF_tbhuabao .txt li{position:absolute;z-index:2;width:100%;height:38px;line-height:38px;display:none;}/*默认标题高度*/ 
.mF_tbhuabao .txt li a{display:block;position:relative;z-index:1;color:#fff;padding-left:16px;font-size:14px;font-weight:bold;text-decoration:none;}/*标题样式*/ 
.mF_tbhuabao .txt li span{display:block;height:100%;position:absolute;top:0;left:0;background:#000;filter:alpha(opacity=30);opacity:0.3;} 
.mF_tbhuabao .dot{position:absolute;bottom:0;left:0;height:32px;line-height:28px;width:100%;text-align:center;} 
.mF_tbhuabao .dot li{display:inline;margin:0 3px;} 
.mF_tbhuabao .dot li a{color:#999;font-size:26px;text-decoration:none;} 
.mF_tbhuabao .dot li.current a{color:#f60;} 
.mF_tbhuabao .prev,.mF_tbhuabao .next{font:700 53px/58px arial;width:37px;height:65px;overflow:hidden;position:absolute;z-index:4;left:-20px;cursor:pointer;background:url(http://547d.ipc.la/img/myfocus/btn-bg.gif) no-repeat;} 
.mF_tbhuabao .next{left:auto;right:-20px;} 
.mF_tbhuabao .prev a,.mF_tbhuabao .next a{display:block;color:#bbb;text-align:center;text-decoration:none;} 
.mF_tbhuabao .prev a:hover,.mF_tbhuabao .next a:hover{color:#f60;} 
</style> 
<script type="text/javascript"> 
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1E)9[p]=1E[p]}}',62,252,'||||||obj|function|if|this||||||style|||||index||||var||return||||cla||par|px|li||img|myFocus|arr|false|opa|speed|auto|className|100|for|width|length|arrStr|opacity|fn|else|run|animate|height|prop|type|dir|less|ul|undefined|next||_turn|scDis|idx|oStyle|scPar|tag|css|scIdx|Timer|push|_dir|div|txt|innerHTML|self|box|id|clearInterval|val|document|getElementsByTagName|_dis|delay|display|onclick|window|tags|true|_stop|setInterval|left|prev|offset|oHead|wrap|_|alpha|pics|initCSS|fnObj|join|ld|num|onmouseover|Math|text|position|params|loading|cla1|lk|span|linear|scD|hidden|none|sn|st|onmouseout|overflow|replace||src|thumb|top|spd|easeOut|easing|am|typeof|reg|filters|padding|background|important|styleSheet|attachEvent|txtHeight|relative|fff|center|addEventListener|getAttribute|scN|parseInt|scMax|slide|fn2|scSpd|hover|setTimeout|break|ln|cla2|null|floor|dis|fn1|scDir|class|tIdx|isless|parentNode|in|right|insertBefore|createElement|border|list|margin|_wrap|toggle|blur|296|Verdana|serif|absolute|9999|color|sans|Geneva|font|12px||bottom|onfocus|object|block|turn|50|test|string|filter|easeIn|getComputedStyle|currentStyle|ceil|RegExp|extend|easeInOut|scroll|getElementById|fadeOut|fadeIn|666|call|new|stop|align|bind|firstChild|setting|try|click|head|clearTimeout|mouseover|inline|cssText|catch|arguments|switchMF|alt|wrapIn|appendChild|addList|load|callee|onload|DOMContentLoaded|removeChild|line|current|i_41956|28236|gif|Setting|bg|com|url|http|nethd|zhongsou|no|wtimg|Error|pic|alert|repeat'.split('|'),0,{})); 
myFocus.extend({//*********************tbhuabao****************** 
mF_tbhuabao:function(par){var box=this.$(par.id);this.addList(box,['dot','txt','prev','next']);this.wrap([this.$c('pic',box)],'win');var pics=this.$c('pic',box),dot=this.$li('dot',box),txt=this.$li('txt',box),pre=this.$c('prev',box),nex=this.$c('next',box);var index=0,n=txt.length,t=par.time*1000;pics.innerHTML+=pics.innerHTML;for(var i=0;i<n;i++)dot[i].innerHTML='•';pre.innerHTML='‹';nex.innerHTML='›';var win=this.$c('win',box),pic=this.$li('pic',box),dots=this.$c('dot',box),dotH=32,arTop=par.height/2-32;box.style.height=par.height+dotH+'px';win.style.cssText='width:'+par.width+'px;height:'+par.height+'px;';pics.style.width=par.width*2*n+'px';for(var i=0;i<n;i++){txt[i].style.bottom=dotH+'px'}for(var i=0;i<2*n;i++)pic[i].style.cssText='width:'+par.width+'px;height:'+par.height+'px;';pre.style.cssText=nex.style.cssText='top:'+arTop+'px;';eval(this.switchMF(function(){txt[index>=n?(index-n):index].style.display='none';dot[index>=n?(index-n):index].className=''},function(){myFocus.slide(pics,{left:-par.width*next});txt[next>=n?(next-n):next].style.display='block';dot[next>=n?(next-n):next].className='current'},'true'));eval(this.bind('dot','"click"'));eval(this.turn('pre','nex'))} 
}); 
myFocus.setting({ 
id:'myFocus',//焦点图ID 
style:'mF_tbhuabao',//风格样式 
time:3,//切换时间间隔(秒) 
trigger:'click',//触发切换模式：'click'(点击)/'mouseover'(悬停) 
width:450,//设置宽度(主图区) 
height:296,//设置高度(主图区) 
txtHeight:'default'//文字层高度设置，'default'为默认高度，0为隐藏 
}); 
</script> 
</head> 
<body> 
 
<span>请稍候...</span> 
<ul class="pic"> 
<li><img src="http://img.gxlcms.com//Uploads-s/new/2019-09-17-201917/1.jpg" thumb="" alt="图片1来源于网络，版权属于作者" text="图片1更详细的描述文字" /></li> 
<li><img src="http://img.gxlcms.com//Uploads-s/new/2019-09-17-201917/2.jpg" thumb="" alt="版权属于作者，图片2来源于网络" text="图片2更详细的描述文字" /></li> 
<li><img src="http://img.gxlcms.com//Uploads-s/new/2019-09-17-201917/3.jpg" thumb="" alt="图片3来源于网络，版权属于作者" text="图片3更详细的描述文字" /></li> 
<li><img src="http://img.gxlcms.com//Uploads-s/new/2019-09-17-201917/4.jpg" thumb="" alt="版权属于作者，图片4来源于网络" text="图片4更详细的描述文字" /></li> 
<li><img src="http://img.gxlcms.com//Uploads-s/new/2019-09-17-201917/5.jpg" thumb="" alt="图片5来源于网络，版权属于作者" text="图片5更详细的描述文字" /></li> 
</ul> 
 
</body> 
</html>

[Ctrl+A 全选注:如需引入外部Js需刷新才能执行]
可随意更改大小的，里面的参数已经详细说明了，喜欢的就拿去吧