轮播图组件js代码

//轮播图组件function Rolling(o) { this.index = ++o.index || 1; //当前滚动的位置，当index大于可轮播的次数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-activeRolling.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 + '"></li>';  } else {   str += '<li></li>';  } } 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',perObject.attr('re-src'));   nextObject.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);}