 <div class="activity" id="activity-slide">
 <a href="javascript:void(0)" class="pg_left ps_pre"></a>
 <a href="javascript:void(0)" class="pg_right ps_next" ></a>
 <ul class="clearfix">
 <li><a href="javascript:;"><img src="images/activity01-1410.jpg"></a></li>
 <li><a href="javascript:;"><img src="images/activity02-1410.jpg"></a></li>
 <li><a href="javascript:;"><img src="images/activity03-1410.jpg"></a></li>
 <li><a href="javascript:;"><img src="images/activity03-1410.jpg"></a></li>
 <li><a href="javascript:;"><img src="images/activity02-1410.jpg"></a></li>
 </ul>
</div>

#activity-slide是整個(gè)幻燈的入口，后面會(huì)將其作為參數(shù)來(lái)調(diào)用幻燈功能。

兩個(gè)按鈕ps_pre和ps_next將添加click事件響應(yīng)點(diǎn)擊切換功能。

3、功能分析

因?yàn)樽笥仪袚Q都是三個(gè)為一組的切換，如果li總個(gè)數(shù)不是3的倍數(shù)時(shí)，需要增加li節(jié)點(diǎn)填滿。

//需要追加的li節(jié)點(diǎn)個(gè)數(shù)
var addli = 0;
//一組切換3個(gè)li
var num=3;
var lisize = a.find("ul li").size();//獲取li個(gè)數(shù)

//判斷需要添加的li節(jié)點(diǎn)數(shù)量
var reminder=lisize%num;
if(lisize%num!=0){addli = num-reminder;}
else{addli = 0;}
addlist();

上面是判斷得到需要追加的個(gè)數(shù)lisize，然后調(diào)用addlist追加。

addlist如下，從ul的第一個(gè)li開(kāi)始復(fù)制，需要幾個(gè)就復(fù)制出幾個(gè)節(jié)點(diǎn)追加。節(jié)點(diǎn)追加完畢后重新計(jì)算ul的寬度。

 function addlist(){
 for(i=0;i<addli;i++){
 var html = a.find("ul li").eq(i).html();
 a.find("ul").append("<li>"+html+"</li>"); 
 }
 a.find("ul").css({"width":(w_li+margin_li*2)*(lisize+addli)});
 }

現(xiàn)在準(zhǔn)備工作已經(jīng)完成了。接下來(lái)就是給按鈕添加響應(yīng)事件。在幻燈切換時(shí)涉及到左右按鈕的顯示和隱藏，所以先說(shuō)這個(gè)按鈕顯示功能，將此分裝成一個(gè)函數(shù)btnshow。

 /***
 參數(shù)說(shuō)明：
 now:當(dāng)前是第幾組，默認(rèn)是0
 c:總共有幾組
 d:初始化時(shí)li的個(gè)數(shù)
 e:每組顯示li個(gè)數(shù)
 ***/
 function btnshow(now,c,d,e){
 if(d<=e){//如果初始化時(shí)li的個(gè)數(shù)小于一組要顯示的數(shù)，則不顯示pre和next按鈕
 a.find(".ps_next").hide();
 a.find(".ps_pre").hide();
 }else if(now==0){//初始化now=0，顯示第一組，只顯示next
 a.find(".ps_next").show();
 a.find(".ps_pre").hide(); 
 }else if(now==c-1){//顯示到最后一組，只顯示pre
 a.find(".ps_next").hide();
 a.find(".ps_pre").show(); 
 }else{//顯示中間組，pre和next都需要顯示
 a.find(".ps_next").show();
 a.find(".ps_pre").show();
 }
 }

接下來(lái)幻燈切換。這里a是傳入的參數(shù)，也就是 #activity-slide。給它下面的所以的pre和next添加響應(yīng)。

向前一組，組數(shù)now減一，now是幾，就讓ul的margin-left為負(fù)幾倍的組寬（即3倍的（li寬度+margin寬度）），然后顯示對(duì)于按鈕即可。

向后滑動(dòng)一組li同理。

 function photoscroll(){
 a.find(".ps_pre").on("click",function(){//console.log(num); 
 now--;
 if(now >= 0){  
  a.find("ul").animate({"margin-left":-now*num*(w_li+margin_li*2)});
  btnshow(now,parseInt((lisize+addli)/num),lisize,num);
 }
 });

 a.find(".ps_next").on("click",function(){//console.log(num); 
 now++;
 if(now < (lisize+addli)/num){ 
  a.find("ul").animate({"margin-left":-now*num*(w_li+margin_li*2)});
  btnshow(now,parseInt((lisize+addli)/num),lisize,num);
 } 
 }); 
 btnshow(now,parseInt((lisize+addli)/num),lisize,num); 
 }

三、實(shí)例代碼

1、用到圖片

2、完整代碼

<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title></title>
<link rel="stylesheet" type="text/css" href="css/style.css">

<script>
window.onresize=function(){
 var winWidth = document.body.clientWidth;
 if(winWidth <=1180){
 body.className="grid-960"; 
 }else if (winWidth<= 1410){
 body.className="grid-1180"; 
 }else if (winWidth>1410){
 body.className="grid-1410"; 
 }else {
 alert("do not know!");
 }
}
</script>
</head>
<body id="body" class="">
<script>//初始化狀態(tài)顯示樣式判斷,放在body后面
var winWidth = document.body.clientWidth;
if (winWidth <=1180){
 body.className="grid-960"; 
}else if (winWidth<= 1410){
 body.className="grid-1180"; 
}else if (winWidth>1410){
 body.className="grid-1410"; 
}else {
 alert("do not know!");
}
</script>
<div class="wapper">
 
 <div class="section">
 <h2 class="title">熱門(mén)活動(dòng)</h2>
 <div class="activity" class="movie" id="activity-slide">
 <a href="javascript:void(0)" class="pg_left ps_pre"></a>
 <a href="javascript:void(0)" class="pg_right ps_next" ></a>
 <ul class="clearfix">
 <li><a href="javascript:;"><img src="images/activity01-1410.jpg"></a></li>
 <li><a href="javascript:;"><img src="images/activity02-1410.jpg"></a></li>
 <li><a href="javascript:;"><img src="images/activity03-1410.jpg"></a></li>
 <li><a href="javascript:;"><img src="images/activity03-1410.jpg"></a></li>
 <li><a href="javascript:;"><img src="images/activity02-1410.jpg"></a></li>
 </ul>
 </div>
 </div>

</div>


</body>
</html>
<script src="http://code.jquery.com/jquery-latest.js"></script>
<script>
//首頁(yè)圖片滾動(dòng)切換
(function($){
 $.photolist=function(a){ 
 var w_li = a.find("li").width();
 var h_li = a.find("li").height();
 var margin_li=parseInt(a.find("li").css("marginLeft"));
 var now = 0;
 var num = 0;
 var addli = 0;
 var lisize = a.find("ul li").size();
 var htmlall = a.find("ul").html();
 
 //判斷每次滾動(dòng)數(shù)量
 /*
 var w_body = $("body").width();
 if(w_body <=1170){
 var num = 3;
 }else if(w_body<= 1380){
 var num = 4;
 }else if(w_body>1380){
 var num = 5;
 }
 */
 var num=3;
 
 //判斷需要添加的li節(jié)點(diǎn)數(shù)量
 var reminder=lisize%num;
 if(lisize%num!=0){addli = num-reminder;}
 else{addli = 0;}
 addlist();
 //點(diǎn)擊滾動(dòng)事件
 photoscroll();
 
 $(window).resize(function(){
 //location.reload();
 now = 0;
 addli = 0;
 a.find("ul").html(htmlall);//html內(nèi)容還原初始值
 a.find(".ps_next").show();//按鈕樣式初始化
 a.find(".ps_pre").hide();
 //判斷每次滾動(dòng)數(shù)量
 /*
 var w_body = $("body").width();
 if(w_body <=1170){
 var num = 3;
 }else if(w_body<= 1380){
 var num = 4;
 }else if(w_body>1380){
 var num = 5;
 }
 */
 var num=3;
 //判斷需要添加的li節(jié)點(diǎn)數(shù)量
 var reminder=lisize%num;
 if(lisize%num!=0){addli = num-reminder;}
 else{addli = 0;}
 addlist();
 w_li = a.find("li").width();
 margin_li=parseInt(a.find("li").css("marginLeft"));
 a.find("ul").css({"width":(w_li+margin_li*2)*(lisize+addli)});
 a.find("ul").animate({"margin-left":0});//ul位置還原
 btnshow(now,parseInt((lisize+addli)/num),lisize,num);
 });
 
 
 function addlist(){
 for(i=0;i<addli;i++){
 var html = a.find("ul li").eq(i).html();
 a.find("ul").append("<li>"+html+"</li>"); 
 }
 a.find("ul").css({"width":(w_li+margin_li*2)*(lisize+addli)});
 //console.log(a.find("ul li").size());
 }
 function photoscroll(){
 a.find(".ps_pre").on("click",function(){//console.log(num); 
 now--;
 if(now >= 0){  
  a.find("ul").animate({"margin-left":-now*num*(w_li+margin_li*2)});
  btnshow(now,parseInt((lisize+addli)/num),lisize,num);
 }
 });

 a.find(".ps_next").on("click",function(){//console.log(num); 
 now++;
 if(now < (lisize+addli)/num){ 
  a.find("ul").animate({"margin-left":-now*num*(w_li+margin_li*2)});
  btnshow(now,parseInt((lisize+addli)/num),lisize,num);
 } 
 }); 
 btnshow(now,parseInt((lisize+addli)/num),lisize,num); 
 }
 /***
 參數(shù)說(shuō)明：
 now:當(dāng)前是第幾組，默認(rèn)是0
 c:總共有幾組
 d:初始化時(shí)li的個(gè)數(shù)
 e:每組顯示li個(gè)數(shù)
 ***/
 function btnshow(now,c,d,e){
 if(d<=e){//如果初始化時(shí)li的個(gè)數(shù)小于一組要顯示的數(shù)，則不顯示pre和next按鈕
 a.find(".ps_next").hide();
 a.find(".ps_pre").hide();
 }else if(now==0){//初始化now=0，顯示第一組，只顯示next
 a.find(".ps_next").show();
 a.find(".ps_pre").hide(); 
 }else if(now==c-1){//顯示到最后一組，只顯示pre
 a.find(".ps_next").hide();
 a.find(".ps_pre").show(); 
 }else{//顯示中間組，pre和next都需要顯示
 a.find(".ps_next").show();
 a.find(".ps_pre").show();
 }
 }
 
 }
})(jQuery); 
$.photolist($("#activity-slide"));
</script>

css部分：

@charset "utf-8";
body, div, h1, h2, h3, h4, h5, h6, hr, p, blockquote, dl, dt, dd, ul, ol, li, pre, code, form, fieldset, legend, button, textarea, table, tbody, tfoot, thead, th, td, article, aside, dialog, figure, footer, header, hgroup, menu, nav, section, time, mark, audio, video { margin: 0; padding: 0; outline:nonebackground:transparent;
}
article, aside, dialog, figure, footer, header, hgroup, nav, section { display: block; }
body, button, input, select, textarea { font: 12px/1.5 arial, \5b8b\4f53, sans-serif; }
h1, h2, h3, h4, h5, h6, button, input, select, textarea { font-size: 100%; outline: none }
address, cite, dfn, em, var { font-style: normal; }
code, kbd, pre, samp { font-family: courier new, courier, monospace; }
small { font-size: 12px; }
ul, ol, li { list-style: none; }
img { border: none; }
a { text-decoration: none; outline: thin none; }
a:hover { text-decoration: underline; }
table { border-collapse: collapse; border-spacing: 0; }
.clear { clear: both; }
.clearfix:after { visibility: hidden; display: block; font-size: 0; content: " "; clear: both; height: 0; }
html { -webkit-text-size-adjust: none; }
body { font: 12px/1.5 \5FAE\8F6F\96C5\9ED1, tahoma, arial, \5b8b\4f53, sans-serif; }



.grid-960 .wapper { width: 100%; min-width:960px;height: auto; margin: 0 auto; background: url(../images/bg-body-960.jpg) no-repeat center top; }
.grid-1180 .wapper { width: 100%; min-width:1180px;height: auto; margin: 0 auto; background: url(../images/bg-body-1180.jpg) no-repeat center top; }
.grid-1410 .wapper { width: 100%; min-width:1410px;height: auto; margin: 0 auto; background: url(../images/bg-body-1410.jpg) no-repeat center top; }

/*熱門(mén)活動(dòng)*/
.grid-960 .section { width: 960px; margin: 0 auto;background-color:#eaf2ff; }
.grid-1180 .section { width: 1180px; margin: 0 auto;background-color:#eaf2ff;}
.grid-1410 .section { width: 1410px; margin: 0 auto;background-color:#eaf2ff;}

.title{padding:0 102px;height:70px;line-height:70px;font-size:24px;font-weight:normal;color:#fff;text-shadow: 0 3px #df2828, 3px 0 #df2828;background:#cc2223 url(../images/bg-title.jpg) no-repeat left top;}

.viewall:hover{text-decoration:none;}
.viewall{font-size:18px;;color:#fff;text-shadow: 0 3px #df2828, 3px 0 #df2828;float:right;}

.grid-1410 .title {padding:0 116px;background-image:url(../images/bg-title-1410.jpg);}

.grid-960 .contentwrap{width:800px;margin:0 auto;}
.grid-1180 .contentwrap{width:980px;margin:0 auto;}
.grid-1410 .contentwrap{width:1180px;margin:0 auto;}

.grid-960 .activity{width:826px;height:152px;overflow:hidden;margin:0 auto;position:relative;}
.grid-1180 .activity{width:1020px;height:192px;overflow:hidden;margin:0 auto;position:relative;}
.grid-1410 .activity{width:1230px;height:232px;overflow:hidden;margin:0 auto;position:relative;}

.grid-960 .activity ul{height:152px;overflow:hidden;}
.grid-1180 .activity ul{height:192px;overflow:hidden;}
.grid-1410 .activity ul{height:232px;overflow:hidden;}

.activity li img{display:block;width:100%;height:100%;}
.activity li{display:block;float:left;}

.grid-960 .activity li{width:250px;height:125px;overflow:hidden;margin:12px;}
.grid-1180 .activity li{width:300px;height:150px;overflow:hidden;margin:20px;}
.grid-1410 .activity li{width:360px;height:180px;overflow:hidden;margin:25px;}
/*js切換*/
.pg_left,.pg_right {position: absolute;z-index: 999;width: 35px;height: 50px;overflow: hidden;}
.pg_right {background: transparent url(../images/pg_right.png) no-repeat scroll 5px 7px;}
.pg_right:hover {background: transparent url(../images/hover.png) no-repeat scroll 0 0;}
.grid-960 .pg_right{top:75px;right:16px;margin-top:-25px;}
.grid-1180 .pg_right{top:95px;right:20px;margin-top:-25px;}
.grid-1410 .pg_right{top:115px;right:25px;margin-top:-25px;}

.pg_left {background: transparent url(../images/pg_left.png) no-repeat scroll 5px 7px;}
.pg_left:hover {background: transparent url(../images/hover.png) no-repeat scroll right 0;}
.grid-960 .pg_left{top:75px;left:13px;margin-top:-25px;}
.grid-1180 .pg_left{top:95px;left:20px;margin-top:-25px;}
.grid-1410 .pg_left{top:115px;left:25px;margin-top:-25px;}

以上就是本文的全部?jī)?nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助。

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