save project

snake.py

@@ -55,18 +55,20 @@ while True:
     else:
         y += 30
     position.append((x, y))
-    position.pop(0)
+    
     # 将背景图画上去
     screen.blit(background, (0, 0))
     # 将贪吃蛇的头画上去
     screen.blit(snake_head, position[-1])
+    if pg_x == x and pg_y == y :
+        pg_x = random.randint(0,21)*30
+        pg_y = random.randint(0,15)*30
+    else:
+        position.pop(0)
     # 将贪吃蛇的身体画上去
     for i in range(len(position)-1):
         screen.blit(body, position[i])
 
-    if pg_x == x and pg_y == y :
-        pg_x = random.randint(0,21)*30
-        pg_y = random.randint(0,15)*30
     
     # 将果实画上去
     screen.blit(food, (pg_x , pg_y))