游戏引擎

分离代码，构建建议游戏引擎

index.js

@@ -1,5 +1,71 @@
 //主程序,业务逻辑
 (function(){
 	var game = new Game('canvas');
-	game.launch();
+	//启动页
+	(function(){
+		var stage = game.createStage();
+		stage.bind('keydown',function(e){
+			game.nextStage();
+		});
+		//logo
+		var item = stage.createItem({
+			x:game.width/2,
+			y:game.height*.45,
+			width:100,
+			height:100,
+			speed:10,
+			update:function(context){
+				context.fillStyle = '#FC3';
+				context.beginPath();
+				if(this.times%2){
+					context.arc(this.x,this.y,this.width/2,.20*Math.PI,1.80*Math.PI,false);
+				}else{
+					context.arc(this.x,this.y,this.width/2,.01*Math.PI,1.99*Math.PI,false);
+				}
+				context.lineTo(this.x,this.y);
+				context.closePath();
+				context.fill();
+				context.fillStyle = '#000';
+				context.beginPath();
+				context.arc(this.x+5,this.y-27,7,0,2*Math.PI,false);
+				context.closePath();
+				context.fill();
+			}
+		});
+		item.bind('click',function(){
+			console.log('不要点我！');
+		});
+		//游戏名
+		var item2 = stage.createItem({
+			x:game.width/2,
+			y:game.height*.6,
+			update:function(context){
+				context.font = 'bold 42px Helvetica';
+				context.textAlign = 'center';
+				context.textBaseline = 'middle';
+				context.fillStyle = '#FFF';
+				context.fillText('Pac-Man',this.x,this.y);
+			}
+		});
+		//版权信息
+		stage.createItem({
+			x:game.width-12,
+			y:game.height-5,
+			update:function(context){
+				context.font = '14px Helvetica';
+				context.textAlign = 'right';
+				context.textBaseline = 'bottom';
+				context.fillStyle = '#AAA';
+				context.fillText('© passer-by.com',this.x,this.y);
+			}
+		});
+	})();
+	//游戏主程序
+	(function(){
+		var stage = game.createStage();
+		stage.bind('keydown',function(){
+			console.log('没东西啦……还按！');
+		});
+	})();
+	game.init();
 })();