适应性更强的网页3D轮播图封装

网页伪3D轮播图，其实就是轮播图旋转木马效果。其实在jquery插件库也有很多旋转木马的插件，但是博主封装的这个新的插件比起以上的都适应性更好。其适应性好表现在：调用灵活性高用法更简单，css样式都封装好了基本不用写，在body里面写ul>li>img标签即可，可设置参数多，甚至不同图片的大小都可以自适应轮播，各个浏览器兼容性好(包括IE，虽然我没测过IE8以下浏览器，不过IE8以上都没问题)，好了，以下看代码和用法。

head引入两个文件，第一个是jquery的插件(这是1.11.0版本，当然其他版本也可以哦，不过低版本的相对IE兼容性更好)，第二个是我封装好的javascript脚本

<script src="js/jquery-1.11.0.js" type="text/javascript" charset="utf-8"></script><script src="js/Figure_3D.js" type="text/javascript" charset="utf-8"></script>

body里面插入轮播图，ul的id要为pic_play，当然我这里是7张图，你也可以增加减少图片，但是这里有一个重要问题是，图片数量要为单数，不能为偶数，否则会出问题，这是一个小小的bug。当然你也可以在li里面写<a><img src/></a>也是可以的。

<ul id="pic_play"><li><img src="img/dc1.jpg"/></li><li><img src="img/dc2.jpg"/></li><li><img src="img/dc3.jpg"/></li><li><img src="img/dc4.jpg"/></li><li><img src="img/dc5.jpg"/></li><li><img src="img/dc6.jpg"/></li><li><img src="img/dc7.jpg"/></li></ul>

css基本不用写，不过要习惯性给padding和margin归0

*{margin: 0;padding: 0;list-style: none;}

重要封装脚本Figure_3D.js

//ulwidth:父节点ul总宽度(number),//height:ul和图片的初始化最大高度(中间)(number),//liwidth:图片的初始化最大宽度(中间)(number),//minopacity:图片最小透明度(0~1),//minscale:图片最小缩放系数(0~1),//direction:默认轮播方向("left","right"),//speed:动画速度(number),//delayed:每张图片延时停留时间(number)(注:delayed>=speed),//mousestop:鼠标经过是否停止(false,true),function init(ulwidth,height,liwidth,minopacity,minscale,direction,speed,delayed,mousestop){$("#pic_play").css({"position":"relative","width":ulwidth,"height":height});$("#pic_play>li").css({"position":"absolute","width":liwidth,"height":height});if($("#pic_play>li>a").size()>0){$("#pic_play>li>a").css("display","block");}if($("#pic_play>li>a>img").size()>0){$("#pic_play>li>a>img").css({"display":"block","width":"100%","height":"100%"});}else if($("#pic_play>li>img").size()>0){$("#pic_play>li>img").css({"display":"block","width":"100%","height":"100%"});}else return;var len=$("#pic_play>li").size();jsonstyle=[];var display=-1;var minopacity=minopacity;var opacitystep=(1-minopacity)/(Math.floor(len/2)-1);var minscale=minscale;var scalestep=(1-minscale)/(Math.floor(len/2));var Dvalue=Math.round((($("#pic_play").innerWidth()-$("#pic_play>li").eq(0).outerWidth())/2)/Math.floor(len/2));$("#pic_play>li").each(function(i){if(i<Math.floor(len/2)){var realoff=i*Dvalue;display++;var realwidth=Math.round(minscale*$("#pic_play>li").eq(i).outerWidth());var realheight=Math.round(minscale*$("#pic_play>li").eq(i).outerHeight());var realtop=Math.round(($("#pic_play>li").eq(Math.floor(len/2)).outerHeight()-realheight)/2);jsonstyle[i]={"realOff":realoff,"realIndex":display,"realOpacity":minopacity,"realWidth":realwidth,"realHeight":realheight,"realTop":realtop};$("#pic_play>li").eq(i).css({"left":realoff,"z-index":display,"opacity":minopacity,"width":realwidth,"height":realheight,"top":realtop});minopacity+=opacitystep;if(minopacity>=1){minopacity=1.0;}minscale+=scalestep;}else if(i==Math.floor(len/2)){display++var realwidth=Math.round(minscale*$("#pic_play>li").eq(i).outerWidth());var realheight=Math.round(minscale*$("#pic_play>li").eq(i).outerHeight());                    var realoff=Math.round(($("#pic_play").innerWidth()-$("#pic_play>li").eq(i).outerWidth())/2);jsonstyle[i]={"realOff":realoff,"realIndex":display,"realOpacity":1,"realWidth":realwidth,"realHeight":realheight,"realTop":0};$("#pic_play>li").eq(i).css({"left":realoff,"z-index":display,"opacity":1,"width":realwidth,"height":realheight,"top":0});}else{display--;minscale-=scalestep;var realwidth=Math.round(minscale*$("#pic_play>li").eq(i).outerWidth());var realheight=Math.round(minscale*$("#pic_play>li").eq(i).outerHeight());var realoff=Math.round($("#pic_play").innerWidth()-(realwidth+(len-1-i)*Dvalue));var realtop=Math.round(($("#pic_play>li").eq(Math.floor(len/2)).outerHeight()-realheight)/2);jsonstyle[i]={"realOff":realoff,"realIndex":display,"realOpacity":minopacity,"realWidth":realwidth,"realHeight":realheight,"realTop":realtop};$("#pic_play>li").eq(i).css({"left":realoff,"z-index":display,"opacity":minopacity,"width":realwidth,"height":realheight,"top":realtop});minopacity-=opacitystep;}});animationPlay(direction,speed,delayed);if(mousestop==true){animationStop(direction,speed,delayed);}}//offset:左右按钮分别距离ul左右边距(number),//top:左右按钮距离ul上边距(number),//direction:默认轮播方向("left","right"),一般和init里的一样，如果你不想点击后改变运动方向,//speed:动画速度(number),一般和init里的一样，如果你不想点击后改变动画速度,        //delayed:每张图片延时停留时间(number)(注:delayed>=speed),一般和init里的一样，如果你不想点击后改变延时停留时间,function btn(offset,top,direction,speed,deleyed){var leftbtn=$("<span></span>");leftbtn.css({"width":32,"height":32,"display":"inline-block","position":"absolute","left":offset,"top":top,"background":"url(img/slider-arrow.png) no-repeat -100px 0","cursor":"pointer","z-index":100});var rightbtn=$("<span></span>");rightbtn.css({"width":32,"height":32,"display":"inline-block","position":"absolute","right":offset,"top":top,"background":"url(img/slider-arrow.png) no-repeat 0 0","cursor":"pointer","z-index":100});$("#pic_play").append(leftbtn);$("#pic_play").append(rightbtn);leftbtn.hover(function(){$(this).css("background-position","-160px 0");},function(){$(this).css("background-position","-100px 0");});rightbtn.hover(function(){$(this).css("background-position","-60px 0");},function(){$(this).css("background-position","0 0");});leftbtn.click(function(){clearInterval(timeplay);$("#pic_play>li").stop(true);var li=$("#pic_play>li").first();$("#pic_play").append(li);$("#pic_play>li").each(function(list){$("#pic_play>li").eq(list).css("z-index",jsonstyle[list]["realIndex"]).animate({"left":jsonstyle[list]["realOff"],"opacity":jsonstyle[list]["realOpacity"],"width":jsonstyle[list]["realWidth"],"height":jsonstyle[list]["realHeight"],"top":jsonstyle[list]["realTop"]},speed);});animationPlay(direction,speed,deleyed);});rightbtn.click(function(){clearInterval(timeplay);$("#pic_play>li").stop(true);var li=$("#pic_play>li").last();$("#pic_play").prepend(li);$("#pic_play>li").each(function(list){$("#pic_play>li").eq(list).css("z-index",jsonstyle[list]["realIndex"]).animate({"left":jsonstyle[list]["realOff"],"opacity":jsonstyle[list]["realOpacity"],"width":jsonstyle[list]["realWidth"],"height":jsonstyle[list]["realHeight"],"top":jsonstyle[list]["realTop"]},speed);});animationPlay(direction,speed,deleyed);});}//JSON动画function animationPlay(direction,speed,deleyed){timeplay=setInterval(function(){if(direction.toLowerCase()=="left"){var li=$("#pic_play>li").first();    $("#pic_play").append(li);}else if(direction.toLowerCase()=="right"){var li=$("#pic_play>li").last();    $("#pic_play").prepend(li);}else return;$("#pic_play>li").each(function(list){$("#pic_play>li").eq(list).css("z-index",jsonstyle[list]["realIndex"]).animate({"left":jsonstyle[list]["realOff"],"opacity":jsonstyle[list]["realOpacity"],"width":jsonstyle[list]["realWidth"],"height":jsonstyle[list]["realHeight"],"top":jsonstyle[list]["realTop"]},speed);});},deleyed);}function animationStop(direction,speed,delayed){$("#pic_play").mouseenter(function(){clearInterval(timeplay);});$("#pic_play").mouseleave(function(){animationPlay(direction,speed,delayed)});}

脚本的调用方法，调用一个init函数初始化，定义的参数意义是：自定父节点ul总宽度(number)，自定ul和图片的初始化最大高度(中间那图)(number)，图片的初始化最大宽度(中间那图)(number)，图片最小透明度(0~1)，图片最小缩放系数(0~1)，默认轮播方向("left","right")，动画速度ms(number)，轮播图片延时停留时间ms(number)(注:这个参数必须大于动画速度)，鼠标经过是否停止(false,true)。

$(function(){init(1300,600,600,0.7,0.5,"right",500,3000,false);});

为了运行效果更为显眼，给ul加个边框居中吧。

#pic_play{position: relative;border: 1px solid black;margin: 30px auto;}

看以下运行效果：这里其实每张图的大小都不一样啊，都可以自适应轮播了

大家会发现没有左右切换的按钮？没关系，我们可以调用btn()函数。btn里面的参数意义分别是：左右按钮分别距离ul左右边距(number)，左右按钮距离ul上边距(number)，默认轮播方向("left","right")一般和init里的一样如果你不想点击后改变运动方向，动画速度ms(number)一般和init里的一样如果你不想点击后改变动画速度，每张图片延时停留时间ms(number)(注:这个参数必须大于动画速度)一般和init里的一样如果你不想点击后改轮播停留时间。

$(function(){init(1000,460,460,0.7,0.5,"right",500,3000,false);btn(40,230,"right",500,3000);});

下面来看效果：

如果想用自己的按钮款式，可以直接在我的btn封装函数里面换啊。