diff --git a/examples/cocos-creator-multiplayer/backend/src/shared/game/GameSystem.ts b/examples/cocos-creator-multiplayer/backend/src/shared/game/GameSystem.ts
index 516a158..79a40b6 100644
--- a/examples/cocos-creator-multiplayer/backend/src/shared/game/GameSystem.ts
+++ b/examples/cocos-creator-multiplayer/backend/src/shared/game/GameSystem.ts
@@ -13,9 +13,12 @@ export interface GameSystemState {
     nextArrowId: number
 }
 
+/**
+ * 前后端复用的状态计算模块
+ */
 export class GameSystem {
 
-    // State (Render Pull)
+    // 当前状态
     private _state: GameSystemState = {
         now: 0,
         players: [],
@@ -26,11 +29,12 @@ export class GameSystem {
         return this._state
     }
 
+    // 重设状态
     reset(state: GameSystemState) {
         this._state = Object.merge({}, state);
     }
 
-    // Input
+    // 应用输入，计算状态变更
     applyInput(input: GameSystemInput) {
         if (input.type === 'PlayerMove') {
             let player = this._state.players.find(v => v.id === input.playerId);
diff --git a/examples/cocos-creator-multiplayer/frontend/assets/scenes/GameScene/GameScene.ts b/examples/cocos-creator-multiplayer/frontend/assets/scenes/GameScene/GameScene.ts
index e0d90ea..18c15f6 100644
--- a/examples/cocos-creator-multiplayer/frontend/assets/scenes/GameScene/GameScene.ts
+++ b/examples/cocos-creator-multiplayer/frontend/assets/scenes/GameScene/GameScene.ts
@@ -159,12 +159,13 @@ export class GameScene extends Component {
         let sceneOffset = playerNode.forward.clone().normalize().multiplyScalar(gameConfig.arrowDistance);
         // 攻击落点（逻辑层坐标）
         let targetPos = new Vec2(playerState.pos.x, playerState.pos.y).add2f(sceneOffset.x, -sceneOffset.z);
+        // 发送输入
         this.gameManager.sendClientInput({
             type: 'PlayerAttack',
             // 显示坐标 —> 逻辑坐标
             targetPos: { x: targetPos.x, y: targetPos.y },
             targetTime: this.gameManager.state.now + gameConfig.arrowFlyTime
-        } as any)
+        })
 
         // 冷却时间 1 秒
         this.btnAttack.getComponent(Button)!.interactable = false;
diff --git a/examples/cocos-creator-multiplayer/frontend/assets/scripts/models/GameManager.ts b/examples/cocos-creator-multiplayer/frontend/assets/scripts/models/GameManager.ts
index 256f65a..0f10abf 100644
--- a/examples/cocos-creator-multiplayer/frontend/assets/scripts/models/GameManager.ts
+++ b/examples/cocos-creator-multiplayer/frontend/assets/scripts/models/GameManager.ts
@@ -4,11 +4,16 @@ import { ClientInput, MsgClientInput } from "../shared/protocols/client/MsgClien
 import { MsgFrame } from "../shared/protocols/server/MsgFrame";
 import { serviceProto, ServiceType } from "../shared/protocols/serviceProto";
 
+/**
+ * 前端游戏状态管理
+ * 主要用于实现前端的预测和和解
+ */
 export class GameManager {
 
     client: WsClient<ServiceType>;
-
+    
     gameSystem = new GameSystem();
+
     lastServerState: GameSystemState = this.gameSystem.state;
     lastRecvSetverStateTime = 0;
     selfPlayerId: number = -1;