;(function($){
			//上下切换
			var SwitchPlugin = function(options){
				var self = this;
				this.options = {
					autoSlider:false,		//默认不自动切换
					direction:'horizontal'	//默认水平切换
				};
				this.flag = false;			//记录是否到达最后

				//追加替换用户的参数
				$.extend(this.options,options);

				//垂直切换还是水平切换
				if(this.options.direction == 'vertical'){
					this.options.switch_bottom.on('click',function(){
						self.switchAnimate('bottom');
					});
					this.options.switch_top.on('click',function(){
						self.switchAnimate('top');
					});
				}else if(this.options.direction == 'horizontal'){
					this.setSwitchUlWidth();
					this.options.switch_prev.on('click',function(){
						self.switchAnimate('left');
					});
					this.options.switch_next.on('click',function(){
						self.switchAnimate('right');
					});
				}

				//是否是自动切换
				if(this.options.autoSlider){
					setInterval(function(){
						if(self.flag){
							self.switchAnimate('top');
						}else{
							self.switchAnimate('bottom');
						}
					},3000);
				}

			}
			SwitchPlugin.prototype = {

				//执行切换动画
				switchAnimate:function(align){
					var top = null;
					var left = null;
					if(align == 'bottom'){
						top = this.getSwitchUlTop() - this.getSwitchLiHeight();
						if(Math.abs(top) > this.getSwitchUlHeight() - this.getSwitchLiHeight()){
							this.flag = true;
							return false;
						}
						if(!this.options.switch_ul.is(':animated')){
							this.options.switch_ul.animate({
								top:top
							});
						}

					}else if (align == 'top'){
						top = this.getSwitchUlTop() + this.getSwitchLiHeight();
						if(top > 0){
							this.flag = false;
							return false;
						}
						if(!this.options.switch_ul.is(':animated')){
							this.options.switch_ul.animate({
								top:top
							});
						}
					}else if(align == 'left'){
						left = this.getSwitchUlLeft() + this.getSwitchLiWidth();
						if(left > 0){
							return false;
						}
						if(!this.options.switch_ul.is(':animated')){
							this.options.switch_ul.animate({
								left:left
							});
						}
					}else if(align == 'right'){
						left = this.getSwitchUlLeft() - this.getSwitchLiWidth();
						if(Math.abs(left) > this.getSwitchUlWidth() - (this.getSwitchLiWidth()  * 4 )){
							return false;
						}
						if(!this.options.switch_ul.is(':animated')){
							this.options.switch_ul.animate({
								left:left
							});
						}
					}
				},

				//设置总宽度
				setSwitchUlWidth:function(){
					this.options.switch_ul.width(this.options.switch_ul.find('li').size() * (this.getSwitchLiWidth() + 10));
				},

				//获取一小块内容的宽度
				getSwitchLiWidth:function(){
					return  parseInt(this.options.switch_ul.find('li').outerWidth(true));
				},

				//获取一小块内容的高度
				getSwitchLiHeight:function(){
					return  parseInt(this.options.switch_ul.find('li').height());
				},

				//获取总的宽度
				getSwitchUlWidth:function(){
					return  parseInt(this.options.switch_ul.width());
				},

				//获取总的高度
				getSwitchUlHeight:function(){
					return  parseInt(this.options.switch_ul.height());
				},

				//获取内容的top值
				getSwitchUlTop:function(){
					return  parseInt(this.options.switch_ul.css('top'));
				},

				//获取内容的left值
				getSwitchUlLeft:function(){
					return  parseInt(this.options.switch_ul.css('left'));
				}


			};
			window['SwitchPlugin'] = SwitchPlugin;
		})(jQuery);