save project

snake.py

@@ -22,13 +22,16 @@ while True:
             # 接收到退出事件后退出程序
             exit()
     x += 30
+    possition.append((x,y))
+    possition.pop(0)
     # 将背景图画上去
     screen.blit(background, (0, 0))
-    screen.blit(right, (x, y))
+
+    screen.blit(right, possition[-1])
     # 将贪吃蛇的身体画上去
-    screen.blit(body, (210, 120))
-    screen.blit(body, (180, 120))
-    screen.blit(body, (180, 90))
+    for i in range(len(possition)-1):
+        screen.blit(body, possition[i])
+
     # 将果实画上去
     screen.blit(food, (360, 300))
     # 刷新画面