次数listLength或者等于0,为不可滚动状态 this.num = o.num || 1; //默认滚动一个列表 this.obj = o.obj || null; //要轮播的对象ul this.perObj = o.perObj || null; //向上翻页的按钮对象 this.nextObj = o.nextObj || null; //向下翻页的按钮对象 this.focusPoint = o.focusPoint || null; //焦点对象，默认为null。意思不开启焦点对象，如要开启可传入焦点对象可自动开启 this.focusClass = o.focusClass || 'mien-active'; //当前焦点位置类名 this.replaceBtn = o.replaceBtn || false;//是否在轮播到第一页或最后一页时替换翻页按钮图片。默认值为true,并替换按钮图片为re+图片名。如：per.png替换成re-per.ping console.log(o.replaceBtn) this.listLength = Math.ceil(o.obj.find('li').length / this.num); //可轮播的次数 this.listObj = o.obj.children('li'); this.listWidth =this.listObj.width() + parseInt(this.listObj.css('margin-left')) + parseInt(this.listObj.css('margin-right')); //列表宽度 this.init(); //初始化 }; Rolling.prototype.init = function() {

var thisObj = this;
this.initLeft();
this.replaceFun();
if(this.focusPoint !== null) {
this.createFocusPoint();
}
this.perObj.unbind('click').on('click',function() {
thisObj.rollPrev();
});
this.nextObj.unbind('click').on('click',function() {
thisObj.rollNext();
});
}
//创建焦点,并给当前位置的焦点添加类mien-active
Rolling.prototype.createFocusPoint = function() {
var str = '',thisObj = this;
for(var i = 0; i < this.listLength; i++) {
if(i == this.index - 1) {
str += '<li class="' + this.focusClass + '">';
} else {
str += '

';
}
}
this.focusPoint.append(str);
this.focusPoint.children().click(function() {
var oldIndex = $('.' + thisObj.focusClass).index() + 1; //之前的焦点位置
var index = $(this).index() + 1; //当前点击的焦点
var sum = index - oldIndex;
var perObject = thisObj.perObj.find('img');
var nextObject = thisObj.nextObj.find('img');
if (index == 1 && !thisObj.replaceBtn){
perObject.attr('src',perObject.attr('data-src'));
nextObject.attr('src',nextObject.attr('data-src'));
}else if (index == thisObj.listLength && !thisObj.replaceBtn){
perObject.attr('src',perObject.attr('re-src'));
nextObject.attr('src',nextObject.attr('re-src'));
}else if (!thisObj.replaceBtn){
perObject.attr('src',nextObject.attr('data-src'));
}
thisObj.index += sum;
if(sum > 0) {
thisObj.obj.animate({
marginLeft: '-=' + Math.abs(sum) thisObj.num thisObj.listWidth + 'px'
});
}
if(sum < 0) {
thisObj.obj.animate({
marginLeft: '+=' + Math.abs(sum) thisObj.num thisObj.listWidth + 'px'
});
}
$(this).addClass(thisObj.focusClass).siblings().removeClass(thisObj.focusClass);
});
}
Rolling.prototype.initLeft = function() {
if(this.index == 1) {
return;
}
this.obj.css('margin-left',-(this.index - 1) this.listWidth); //初始化全屏图片显示的位置
}
Rolling.prototype.rollPrev = function() {
--this.index;
//当点击到第一页就return
if (this.index <= 1 && !this.replaceBtn){
this.perObj.find('img').attr('src',this.perObj.find('img').attr('data-src'));
}
if(!this.thisIndex()) {
++this.index;
return;
}
if (!this.replaceBtn){
this.nextObj.find('img').attr('src',this.nextObj.find('img').attr('data-src'));
}
this.obj.animate({
marginLeft: '+=' + this.num this.listWidth + 'px'
});
if(this.focusPoint !== null) {
$('.' + this.focusClass).removeClass(this.focusClass).prev().addClass(this.focusClass);
}
}
Rolling.prototype.rollNext = function() {
++this.index;
if (this.index == this.listLength && !this.replaceBtn){
this.nextObj.find('img').attr('src',this.nextObj.find('img').attr('re-src'));
}
//当点击到最后一页就return
if(!this.thisIndex()) {
--this.index;
return;
}
if (!this.replaceBtn){
this.perObj.find('img').attr('src',this.perObj.find('img').attr('re-src'));
}
this.obj.animate({
marginLeft: '-=' + this.num * this.listWidth + 'px'
});

if(this.focusPoint !== null) {
$('.' + this.focusClass).removeClass(this.focusClass).next().addClass(this.focusClass);
}
}
Rolling.prototype.replaceFun = function(){
var perObject = this.perObj.find('img'),nextObject = this.nextObj.find('img');
var perSrc = perObject.attr('src'),nextSrc = nextObject.attr('src');
perObject.attr({'data-src':perSrc,'re-src':this.splitSrc(perSrc)});
nextObject.attr({'data-src':nextSrc,'re-src':this.splitSrc(nextSrc)});
}

Rolling.prototype.splitSrc = function(str){
var list = str.split('/');
var data = list[list.length-1];
var sub = data.substr(0,data.indexOf('.'));
return str.replace(sub,'re-' + sub);
}

Rolling.prototype.thisIndex = function() {
if(this.index > this.listLength | this.index <= 0) {
return false;
}
return true;
}

function createRolling(o) {
return new Rolling(o);
}