新增基础实体系统

demo/src/game/SpawnerComponent.ts

@@ -0,0 +1,25 @@
+class SpawnComponent extends Component {
+    public cooldown = -1;
+    public minInterval = 2;
+    public maxInterval = 60;
+    public enemyType = EnemyType.worm;
+    public numSpawned = 0;
+    public numAlive = 0;
+
+    constructor(enemyType: EnemyType) {
+        super();
+        this.enemyType = enemyType;
+    }
+
+    public initialize() {
+        // console.log("initialize");
+    }
+
+    public update() {
+        // console.log("update");
+    }
+}
+
+enum EnemyType {
+    worm
+}