$(function(){
    //处理缩放;
    $(".viewArea li span.box img").zoom({width:103,height:74})
    //新品展示滚动
    var marginleft=-339;                                                                                            
    $(".moveRight").click(function(){  
        marginleft= marginleft -113;                                                                                                            
        $(".viewArea").animate({"left":marginleft+"px"},200)
        if(marginleft==-565){
            marginleft=-339;
            marginleft+=113;
        }                                                                                                                        
    }); 
    $(".moveLeft").click(function(){  
        marginleft= marginleft +113;                        
        $(".viewArea").animate({"left":marginleft+"px"},200) 
        if(marginleft==0){                                                                                                       
            marginleft=-339;
        }                                                                                                                                     
    });     

});


(function($){

    $.fn.zoom = function(settings){
                //一些默认配置；
                settings = $.extend({
                    height:0,
                    width:0,
                    loading:"http://www.dadachina.com/images/lightbox-ico-loading.gif"
                    },settings);
                    
                var images = this;
                $(images).hide();
                var loadding = new Image();
                loadding.className="loadding"
                loadding.src = settings.loading;
                $(images).after(loadding);    
                
                //预加载
                var preLoad = function($this){
                    var img = new Image();
                    img.src = $this.src;
                    if (img.complete) { 
                        processImg.call($this);
                        return;
                    }
                    //$this.src = loadding.src;//会导致获取错误的尺寸
                    img.onload = function(){
                        //$this.src = this.src; //会导致获取错误的尺寸
                        
                        processImg.call($this);
                        img.onload=function(){};
                    } 
                }
                
                //计算图片尺寸；
                function processImg(){
                        if(settings.height===0||settings.width ===0) return;
                        var m = this.height-settings.height;
                        var n = this.width - settings.width;
                        if(m>n)                        
                            this.height = this.height>settings.height ? settings.height : 

this.height;
                        else
                            this.width = this.width >settings.width ? settings.width : 

this.width;

                        $(this).next(".loadding").remove()
                        $(this).show();
                }
                
                return $(images).each(function(){
                    preLoad(this);
                });                
        }

})(jQuery);