官网没有详细样例，仅仅有看api，研究成果例如以下

var that = this;        var url = "http://xxxxxx";        cc.loader.loadImg(url, null, function(err,img){        	var logo  = new cc.Sprite(img);         	that.addChild(logo);        	logo.x = size.width / 2;        	logo.y = size.height / 2;        });