diff --git a/game_functions.py b/game_functions.py
new file mode 100644
index 0000000..78dcf2c
--- /dev/null
+++ b/game_functions.py
@@ -0,0 +1,409 @@
+import sys
+import pygame
+import random
+import operator
+import json
+from bullet import Bullet
+from super_bullet import SuperBullet
+from alien import Alien
+from alien_bullet import AlienBullet
+from time import sleep
+from threading import Timer
+
+
+"""
+用户操作响应
+"""
+
+def check_events(ai_settings, screen, ship, bullets, aliens, stats, play_button, scoreboard, alien_bullets, super_bullets, playername_inputbox):
+    """响应按键和鼠标事件"""
+    for event in pygame.event.get():
+        if event.type == pygame.QUIT:
+            sys.exit()
+        elif event.type == pygame.KEYDOWN:
+            check_keydown_events(event, ai_settings, screen, ship, bullets, stats, scoreboard, super_bullets, playername_inputbox)
+        elif event.type == pygame.KEYUP:
+            check_keyup_events(event, ship)
+        elif event.type == pygame.MOUSEBUTTONDOWN:
+            mouse_x, mouse_y = pygame.mouse.get_pos()
+            check_playername_input(playername_inputbox, stats, mouse_x, mouse_y)
+            check_play_button(ai_settings, screen, ship, bullets, aliens, stats, play_button, mouse_x, mouse_y, scoreboard, alien_bullets, super_bullets,  playername_inputbox)
+
+
+def check_keydown_events(event, ai_settings, screen, ship, bullets, stats, scoreboard, super_bullets, playername_inputbox):
+    """响应按键按下"""
+    if event.key == pygame.K_RIGHT:
+        ship.moving_right = True
+    elif event.key == pygame.K_LEFT:
+        ship.moving_left = True
+    elif event.key == pygame.K_SPACE:
+        if stats.game_active:
+            fire_bullet(ai_settings, screen, ship, bullets)
+    elif event.key == pygame.K_UP:
+        if stats.game_active:
+            activate_super_mode(ai_settings, ship, stats, scoreboard)
+    elif event.key == pygame.K_LALT:
+        if stats.game_active:
+            fire_super_bullet(ai_settings, screen, ship, stats, super_bullets)
+    elif event.key == pygame.K_q:
+        sys.exit()
+    else:
+        if playername_inputbox.login == False:
+            playername_inputbox.key_down(event)
+
+def check_keyup_events(event, ship):
+    """响应按键松开"""
+    if event.key == pygame.K_RIGHT:
+        ship.moving_right = False
+    elif event.key == pygame.K_LEFT:
+        ship.moving_left = False
+
+
+def check_playername_input(playername_inputbox, stats, mouse_x, mouse_y):
+    """检查用户点击玩家名称输入框，若点击，则清空文本"""
+    if playername_inputbox.rect.collidepoint(mouse_x, mouse_y) and not stats.game_active:
+        playername_inputbox.text = ''
+
+def check_play_button(ai_settings, screen, ship, bullets, aliens, stats, play_button, mouse_x, mouse_y, scoreboard, alien_bullets, super_bullets,  playername_inputbox):
+    """检查开始游戏按钮是否被按下，并响应"""
+    if play_button.rect.collidepoint(mouse_x, mouse_y) and not stats.game_active:
+        # 隐藏光标
+        pygame.mouse.set_visible(False)
+        # 重置游戏参数
+        ai_settings.initialize_dynamic_settings()
+        stats.reset_stats()
+        # 重置记分牌
+        scoreboard.prep_images()
+        # 设置状态为激活
+        stats.game_active = True
+        # 清屏并创建新的一群外星人
+        clear_and_create_fleet(ai_settings, screen, ship, bullets, aliens, alien_bullets, super_bullets)
+        if playername_inputbox.login == False:
+            stats.player = playername_inputbox.text
+            playername_inputbox.login = True
+
+
+def fire_super_bullet(ai_settings, screen, ship, stats, super_bullets):
+    if stats.power >= ai_settings.points_of_power:
+        ai_settings.super_bullet_sound.play()
+        new_super_bullet = SuperBullet(ai_settings, screen, ship)
+        super_bullets.add(new_super_bullet)
+        stats.power -= ai_settings.points_of_power
+
+
+def fire_bullet(ai_settings, screen, ship, bullets):
+    if len(bullets) < ai_settings.bullets_allowed:
+        ai_settings.bullet_sound.play()
+        new_bullet = Bullet(ai_settings, screen, ship)
+        bullets.add(new_bullet)
+
+
+def activate_super_mode(ai_settings, ship, stats, scoreboard):
+    """响应进入无敌模式"""
+    if stats.power >= ai_settings.points_of_power:
+        if ship.super_mode == False:
+            ai_settings.super_mode_sound.play()
+            ship.super_mode = True
+            stats.power -= ai_settings.points_of_power
+            scoreboard.prep_power()
+            Timer(5, quit_super_mode, args=[ship]).start()
+
+def quit_super_mode(ship):
+    ship.super_mode = False
+
+
+"""
+子弹参数更新（包括超级子弹）
+"""
+
+def update_bullets(ai_settings, screen, ship, bullets, aliens, stats, scoreboard, super_bullets):
+    """更新子弹位置并检查碰撞"""
+    # 更新子弹位置
+    bullets.update()
+    super_bullets.update()
+    # 删除已超出范围的子弹
+    for bullet in bullets.copy():
+        if bullet.rect.bottom <= 0:
+            bullets.remove(bullet)
+    for super_bullet in super_bullets.copy():
+        if super_bullet.rect.bottom <= 0:
+            super_bullets.remove(super_bullet)
+
+    check_bullet_alien_collision(ai_settings, screen, ship, bullets, aliens, stats, scoreboard, super_bullets)
+
+
+def check_bullet_alien_collision(ai_settings, screen, ship, bullets, aliens, stats, scoreboard, super_bullets):
+    """响应子弹击中外星人"""
+    # 检查是否有子弹击中外星人，若有，删除对应的子弹与外星人
+    collisions = pygame.sprite.groupcollide(bullets, aliens, True, True)
+    super_collisions = pygame.sprite.groupcollide(super_bullets, aliens, False, True)
+
+    if collisions:
+        for aliens in collisions.values():
+            stats.score += ai_settings.alien_points * len(aliens)
+            stats.power += ai_settings.alien_points * len(aliens)
+            scoreboard.prep_score()
+            scoreboard.prep_power()
+        # 检查是否打破历史记录
+        check_high_score(stats, scoreboard)
+
+    if super_collisions:
+        for aliens in super_collisions.values():
+            stats.score += ai_settings.alien_points * len(aliens)
+            stats.power += ai_settings.alien_points * len(aliens)
+            scoreboard.prep_score()
+            scoreboard.prep_power()
+        # 检查是否打破历史记录
+        check_high_score(stats, scoreboard)
+
+    if len(aliens) == 0:
+        # 外星人被消灭干净，开启新等级
+        start_new_level(ai_settings, screen, ship, bullets, aliens, stats, scoreboard, super_bullets)
+
+
+def start_new_level(ai_settings, screen, ship, bullets, aliens, stats, scoreboard, super_bullets):
+    """响应外星人被消灭干净"""
+    ai_settings.start_new_level_sound.play()
+    bullets.empty()
+    super_bullets.empty()
+    ai_settings.increase_speed()
+    create_fleet(ai_settings, screen, ship, aliens)
+    stats.level += 1
+    scoreboard.prep_level()
+
+
+def check_high_score(stats, scoreboard):
+    """响应打破历史记录"""
+    if stats.score > stats.high_score:
+        stats.high_score = stats.score
+        scoreboard.prep_high_score()
+
+
+"""
+外星人参数更新
+"""
+
+def update_aliens(ai_settings, screen, ship, bullets, aliens, stats, scoreboard, alien_bullets, super_bullets):
+    """更新所有外星人的位置"""
+    check_fleet_edges(ai_settings, aliens)
+    aliens.update()
+
+    # 检测外星人和飞船的碰撞
+    if pygame.sprite.spritecollideany(ship, aliens):
+        ship_hit(ai_settings, screen, ship, bullets, aliens, stats, scoreboard, alien_bullets, super_bullets)
+
+    check_aliens_bottom(ai_settings, screen, ship, bullets, aliens, stats, scoreboard, alien_bullets, super_bullets)
+
+
+def check_fleet_edges(ai_settings, aliens):
+    """有外星人到达屏幕边缘时采取相应措施"""
+    for alien in aliens.sprites():
+        if alien.check_edges():
+            change_fleet_direction(ai_settings, aliens)
+            break
+
+def change_fleet_direction(ai_settings, aliens):
+    """将外星人整体下移一行并改变移动方向"""
+    for alien in aliens.sprites():
+        alien.rect.y += ai_settings.fleet_drop_speed
+    ai_settings.fleet_direction *= -1
+
+
+def check_aliens_bottom(ai_settings, screen, ship, bullets, aliens, stats, scoreboard, alien_bullets, super_bullets):
+    """检查是否有外星人撞到屏幕底端"""
+    screen_rect = screen.get_rect()
+    for alien in aliens.sprites():
+        if alien.rect.bottom >= screen_rect.bottom:
+            # 像飞船与外星人相撞一样处理
+            ship_hit(ai_settings, screen, ship, bullets, aliens, stats, scoreboard, alien_bullets, super_bullets)
+            break
+
+def ship_hit(ai_settings, screen, ship, bullets, aliens, stats, scoreboard, alien_bullets, super_bullets):
+    """响应飞船与外星人碰撞"""
+    if stats.ships_left > 0:
+        """仍有剩余飞船，游戏继续"""
+        ai_settings.ship_hit_sound.play()
+        # 将剩余飞船数减一
+        stats.ships_left -= 1
+        # 清空外星人和子弹列表并创建一批新外星人
+        clear_and_create_fleet(ai_settings, screen, ship, bullets, aliens, alien_bullets, super_bullets)
+        # 更新剩余飞船数
+        scoreboard.prep_ships()
+
+    else:
+        """游戏结束"""
+        if stats.score == stats.high_score:
+            ai_settings.recordbroken_sound.play()
+        else:
+            ai_settings.gameover_sound.play()
+        stats.game_active = False
+        pygame.mouse.set_visible(True)
+
+        # 记录此次玩家得分
+        new_score = { 'player': stats.player, 'score': stats.score }
+        stats.scores_data.append(new_score)
+        stats.scores_data.sort(key=lambda x:x["score"], reverse=True)
+        with open('scores.json', 'w') as f:
+            json.dump(stats.scores_data, f)
+
+        # 打印历史得分排行榜Top10
+        if len(stats.scores_data) >= 10:
+            leaderboard_height = 340
+        else:
+            leaderboard_height = len(stats.scores_data) * 30 + 40
+
+        leaderboard_rect = pygame.Rect(450, 180, 300, leaderboard_height)
+        screen.fill(ai_settings.lb_bg_color, leaderboard_rect)
+
+        # 表头
+        leaderboard_font = pygame.font.SysFont("Calibri, Arial", 28)
+        rank_image_rect = draw_leaderboard(ai_settings.lb_text_color, ai_settings.lb_bg_color, screen, 'Rank', leaderboard_font, 500, 200)
+        player_image_rect = draw_leaderboard(ai_settings.lb_text_color, ai_settings.lb_bg_color, screen, 'Player', leaderboard_font, 600, 200)
+        score_image_rect = draw_leaderboard(ai_settings.lb_text_color, ai_settings.lb_bg_color, screen, 'Score', leaderboard_font, 700, 200)
+
+        rank = 0
+        for player_score in stats.scores_data:
+            """逐个显示玩家得分"""
+            rank += 1
+            if rank > 10:
+                break
+            rank_text = str(rank)
+            player_text = str(player_score["player"])
+            score_text = str(player_score["score"])
+            y_postion = rank_image_rect.centery + 30 * rank
+            font = leaderboard_font
+            text_color = ai_settings.lb_text_color
+            bg_color = ai_settings.lb_bg_color
+            if player_score == new_score:
+                """当前用户的信息，样式不同"""
+                general_font = pygame.font.SysFont("Calibri, Arial", 32, True)
+                text_color = (255, 255, 0)
+
+            draw_leaderboard(text_color, bg_color, screen, rank_text, font, rank_image_rect.centerx, y_postion)
+            draw_leaderboard(text_color, bg_color, screen, player_text, font, player_image_rect.centerx, y_postion)
+            draw_leaderboard(text_color, bg_color, screen, score_text, font, score_image_rect.centerx, y_postion)
+
+        pygame.display.flip()
+        sleep(5)
+
+    sleep(0.5)
+
+
+def draw_leaderboard(text_color ,bg_color, screen, text, font, x, y):
+    """绘制排行榜的某一项"""
+    image = font.render(text, True, text_color, bg_color)
+    image_rect = image.get_rect()
+    image_rect.centerx = x
+    image_rect.centery = y
+    screen.blit(image, image_rect)
+    return image_rect
+
+
+def clear_and_create_fleet(ai_settings, screen, ship, bullets, aliens, alien_bullets, super_bullets):
+    """清空外星人和子弹列表并创建一批新外星人"""
+    # 清空外星人和子弹列表
+    bullets.empty()
+    super_bullets.empty()
+    aliens.empty()
+    alien_bullets.empty()
+
+    # 创建一批新的外星人，并将飞船放到屏幕底部中央
+    create_fleet(ai_settings, screen, ship, aliens)
+    ship.center_ship()
+
+
+def create_fleet(ai_settings, screen, ship, aliens):
+    """创建外星人群"""
+    alien = Alien(ai_settings, screen)
+    number_aliens_x = get_number_aliens_x(ai_settings, alien.rect.width)
+    number_rows = get_number_rows(ai_settings, alien.rect.height, ship.rect.height)
+    for row_number in range(number_rows):
+        for alien_number in range(number_aliens_x):
+            create_alien(ai_settings, screen, aliens, alien_number, row_number)
+
+def get_number_aliens_x(ai_settings, alien_width):
+    """计算一行可容纳多少外星人"""
+    available_space_x = ai_settings.screen_width - 2 * alien_width
+    number_aliens_x = int(available_space_x / (2 * alien_width))
+    return number_aliens_x
+
+def get_number_rows(ai_settings, alien_height, ship_height):
+    """计算可容纳多少行外星人"""
+    available_space_y = ai_settings.screen_height - 6 * alien_height - ship_height
+    number_rows = int(available_space_y / (2 * alien_height))
+    return number_rows
+
+def create_alien(ai_settings, screen, aliens, alien_number, row_number):
+    """创建一个外星人并把它加入当前行"""
+    alien = Alien(ai_settings, screen)
+    alien_width = alien.rect.width
+    alien_height = alien.rect.height
+    alien.x = alien_width + 2 * alien_width * alien_number
+    alien.rect.x = alien.x
+    alien.rect.y = alien_height + 2 * alien_height * row_number
+    aliens.add(alien)
+
+
+"""
+外星人子弹更新
+"""
+
+def update_aliens_fire_bullet(ai_settings, screen, ship, bullets, aliens, stats, scoreboard, alien_bullets, super_bullets):
+    """更新外星人发射的子弹"""
+    for alien in aliens.sprites():
+        flag_is_last_line = True
+        for alien_next in aliens.sprites():
+            if (alien.rect.y + alien.rect.height * 2 == alien_next.rect.y
+            and alien.rect.x == alien_next.rect.x):
+                flag_is_last_line = False
+                break
+        if flag_is_last_line:
+            """外星人有一定的概率发射子弹"""
+            if random.randint(0,3000) < 1:
+                new_alien_bullet = AlienBullet(ai_settings, screen, alien)
+                alien_bullets.add(new_alien_bullet)
+
+    check_alien_bullet_ship_collision(ai_settings, screen, ship, bullets, aliens, stats, scoreboard, alien_bullets, super_bullets)
+    alien_bullets.update()
+
+
+def check_alien_bullet_ship_collision(ai_settings, screen, ship, bullets, aliens, stats, scoreboard, alien_bullets, super_bullets):
+    """响应外星人子弹击中飞船"""
+    for alien_bullet in alien_bullets.sprites():
+        if alien_bullet.rect.colliderect(ship.rect) and not ship.super_mode:
+            ship_hit(ai_settings, screen, ship, bullets, aliens, stats, scoreboard, alien_bullets, super_bullets)
+            break
+
+
+"""
+屏幕更新
+"""
+
+def update_screen(ai_settings, screen, ship, bullets, aliens, stats, play_button, scoreboard, alien_bullets, super_bullets, playername_inputbox):
+    """更新屏幕上的图像，并切换到新屏幕"""
+    # 重绘屏幕
+    screen.fill(ai_settings.bg_color)
+    if playername_inputbox.login == False:
+        playername_inputbox.draw_inputbox()
+
+    # 绘制全部子弹
+    for bullet in bullets.sprites():
+        bullet.draw_bullet()
+    for alien_bullet in alien_bullets.sprites():
+        alien_bullet.draw_alien_bullet()
+    for super_bullet in super_bullets.sprites():
+        super_bullet.draw_bullet()
+    # 绘制玩家飞船
+    ship.blitme()
+    # 绘制全部外星人
+    aliens.draw(screen)
+    scoreboard.ships.draw(screen)
+    # 显示得分
+    scoreboard.show_score()
+
+    # 如果游戏处于非活动状态，就显示Play按钮
+    if stats.game_active == False:
+        play_button.draw_button()
+
+    # 让最近绘制的屏幕可见
+    pygame.display.flip()