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项目中要用到旋转木马效果，一共5张图片轮播，并且点击对应的索引按钮能切换到对应的图片。本效果实在jquery.carousel.js插件的基础上做了一些改进，以实现上述需求。
效果图如下：
代码：
HTML：
jQuery自动轮播旋转木马插件
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CSS：
/*公共css*/
body,div,dl,dt,dd,ul,ol,li,h1,h2,h3,h4,h5,h6,pre,form,fieldset,input,textarea,p,blockquote,th,td{margin:0;padding:0;}
table{border-collapse:collapse;border-spacing:0;}
fieldset,img{border:0;}
address,caption,cite,code,dfn,em,strong,th,var{font-style:normal;font-weight:normal;}
ol,ul{list-style:none;}
caption,th{text-align:left;}
h1,h2,h3,h4,h5,h6{font-size:100%;font-weight:normal;}
q:before,q:after{content: ;}
abbr,acronym{border:0;}
body{color:#666; background-color:#fff;}
.clearfix:after {visibility:hidden;display:block;font-size:0;content:" ";clear:both;height:0;}
.clearfix {zoom:1;}
/*轮播样式ʽ*/
.poster-main{position: relative;width: 900px;height: 270px}
.poster-main a,.poster-main img{display:block;}
.poster-main .poster-list{width: 900px;height: 270px}
.poster-main .poster-list .poster-item{position: absolute;left: 0px;top: 0px}
.poster-main .poster-btn{
cursor: pointer;
position: absolute;
top:290px;
width:14px !important;
height:14px !important;
text-align: center;
line-height: 14px;
color: #ffffff;
-webkit-border-radius: 50%;
-moz-border-radius: 50%;
border-radius: 50%;
background-color: #feb320;
z-index: 10;
}
.btn-box{
position: absolute;
top: 290px;
left: 50%;
margin-left: -60px;
width: 120px;
height: 20px;
}
.index-btn{
cursor: pointer;
float: left;
width: 14px;
height: 14px;
color: #ffffff;
margin: 0 5px;
-webkit-border-radius: 50%;
-moz-border-radius: 50%;
border-radius: 50%;
background-color: #feb320;
z-index: 10;
}
.poster-main .poster-prev-btn{
left: 20%;
}
.poster-main .poster-next-btn{
left: 80%;
}
.index-btn.poster-btn-active{
background-color: #fe7d0f;
}
jquery.carousel.js：
/**
* 改进版
*/
var MIDDLE_PIC_POS = 1
//计算如何用最短的距离移动到目标
//由于有两种移动方式,向左边移动或者像右边移动,只需要在这两种方式中选择一个小的就行了
;(function($){
var Caroursel = function (caroursel){
var self = this;
this.caroursel = caroursel;
this.posterList = caroursel.find(".poster-list");
this.posterItems = caroursel.find(".poster-item");
this.firstPosterItem = this.posterItems.first();
this.lastPosterItem = this.posterItems.last();
this.prevBtn = this.caroursel.find(".poster-prev-btn");
this.nextBtn = this.caroursel.find(".poster-next-btn");
this.buttonItems = caroursel.find(".index-btn");
//每个移动元素的位置索引,用于记录每个元素当前的位置,在每次移动的时候,该数组的值都会发生变化
//数组的下标对应li元素的位置索引
this.curPositions = [];
for(var i = 0;i this.curPositions.length) {//移动超过末尾,则位置变成到开头
nextPos = nextPos - this.curPositions.length;
}else
if (nextPos < 1) {向左边移动已经移动到开始位置更左边,则位置变成结束
nextPos = this.curPositions.length + nextPos;
}
this.curPositions[i] = nextPos;
}
//console.log('after refreshPositions',this.curPositions);
this.refreshCss();
},
cal_move_path:function(curPos,desPos,arraySize) {
//console.log("begin cal_move_path ",curPos,desPos,arraySize);
if(curPos == desPos) return null;
//往左边移动
var goRightSteps;
var goLeftSteps;
var retDirect;
var retStep;
if(curPos > desPos){
goRightSteps = curPos - desPos;
goLeftSteps = desPos + (arraySize - curPos);
retDirect = (goRightSteps <= goLeftSteps) ? "right":"left";
return {"direct":retDirect,"step":Math.min(goLeftSteps,goRightSteps)};
}
},
//点击位置按钮,根据点击的按钮索引 决定向左还是向右移动[因为只有三个位置,该方法能够仅靠向左或向右就能将
//指定的位置移动到中间]
clickPosButtonIndex:function(index){
//console.log('click the index ' + index,'the curPositions is ',this.curPositions);
var self = this;
if(self.rotateFlag == false) {//目前正在移动等移动结束后才能进入
return;
}
var curPos = this.curPositions[index];
var retPath = this.cal_move_path(curPos,MIDDLE_PIC_POS,this.curPositions.length);
if (retPath == null){
return;
}
var direct = retPath.direct;
var step = retPath.step;
self.rotateFlag = false;
self.rotateAnimate(direct,step)
},
rotateAnimate:function(type,step){
step = step || 1;
//console.log('begin rotateAnimate ' + type + "the step is " + step);
var that = this;
var zIndexArr = [];
var speed = that.setting.speed;
this.posterItems.each(function(){
var self = $(this);
var destPic = null;
var curPic = self;
for (var i = 0; i < step;++i){
if(type == "left"){// 向左边移动, 下一张图片在自己的右边,所以用next()
destPic = curPic.next().get(0)?curPic.next():that.firstPosterItem;
}
else{
destPic = curPic.prev().get(0)?curPic.prev():that.lastPosterItem;
}
curPic = destPic;
}
var width = destPic.css("width");
var height = destPic.css("height");
var zIndex = destPic.css("zIndex");
var opacity = destPic.css("opacity");
var left = destPic.css("left");
var top = destPic.css("top");
zIndexArr.push(zIndex);
self.animate({
"width":width,
"height":height,
"left":left,
"opacity":opacity,
"top":top
},speed,function(){
that.rotateFlag = true;
});
});
this.posterItems.each(function(i){
$(this).css("zIndex",zIndexArr[i]);
});
if (type == 'right'){
this.refreshPositions(-step);
}else{
this.refreshPositions(step);
}
},
setFirstPosition:function(){
this.caroursel.css({"width":this.setting.width,"height":this.setting.height});
this.posterList.css({"width":this.setting.width,"height":this.setting.height});
var width = (this.setting.width - this.setting.posterWidth) / 2;
this.prevBtn.css({"width":width , "height":this.setting.height,"zIndex":Math.ceil(this.posterItems.size()/2)});
this.nextBtn.css({"width":width , "height":this.setting.height,"zIndex":Math.ceil(this.posterItems.size()/2)});
this.firstPosterItem.css({
"width":this.setting.posterWidth,
"height":this.setting.posterHeight,
"left":width,
"zIndex":Math.ceil(this.posterItems.size()/2),
"top":this.setVertialType(this.setting.posterHeight)
});
},
setSlicePosition:function(){
var _self = this;
var sliceItems = this.posterItems.slice(1),
level = Math.floor(this.posterItems.length/2),
leftItems = sliceItems.slice(0,level),
rightItems = sliceItems.slice(level),
posterWidth = this.setting.posterWidth,
posterHeight = this.setting.posterHeight,
Btnwidth = (this.setting.width - this.setting.posterWidth) / 2,
gap = Btnwidth/level,
containerWidth = this.setting.width;
var i = 1;
var leftWidth = posterWidth;
var leftHeight = posterHeight;
var zLoop1 = level;
console.log(leftItems);
console.log(rightItems);
leftItems.each(function(index,item){
var scale = _self.setting.scale;
if(index==1){
scale = scale*scale;
}
leftWidth = posterWidth * scale;
leftHeight = posterHeight*scale;
console.log(leftWidth)
console.log(leftHeight)
$(this).css({
"width":leftWidth,
"height":leftHeight,
"left": Btnwidth - i*gap,
"zIndex":zLoop1--,
"opacity":1/(i+1),
"top":_self.setVertialType(leftHeight)
});
i++;
});
var j = level;
var zLoop2 = 1;
var rightWidth = posterWidth;
var rightHeight = posterHeight;
rightItems.each(function(index,item){
var scale = _self.setting.scale;
if(index==0){
scale = scale*scale;
}
var rightWidth = posterWidth * scale;
var rightHeight = posterHeight*scale;
$(this).css({
"width":rightWidth,
"height":rightHeight,
"left": containerWidth -( Btnwidth - j*gap + rightWidth),
"zIndex":zLoop2++,
"opacity":1/(j+1),
"top":_self.setVertialType(rightHeight)
});
j--;
});
},
getSetting:function(){
var settting = this.caroursel.attr("data-setting");
if(settting.length > 0){
return $.parseJSON(settting);
}else{
return {};
}
},
setVertialType:function(height){
var align = this.setting.align;
if(align == "top") {
return 0
}else if(align == "middle"){
return (this.setting.posterHeight - height) / 2
}else if(align == "bottom"){
return this.setting.posterHeight - height
}else {
return (this.setting.posterHeight - height) / 2
}
}
};
Caroursel.init = function (caroursels){
caroursels.each(function(index,item){
new Caroursel($(this));
}) ;
};
window["Caroursel"] = Caroursel;
})(jQuery);