更新 'button.py'

button.py

@@ -20,10 +20,15 @@ class Button():
 
         # 按钮的标签只需创建一次
         self.prep_msg(msg)
-        
-   def prep_msg(self, msg):
+
+    def prep_msg(self, msg):
         """将msg渲染为图像，并使其在按钮上居中"""
         self.msg_image = self.font.render(msg, True, self.text_color,
                                           self.button_color)
         self.msg_image_rect = self.msg_image.get_rect()
-        self.msg_image_rect.center = self.rect.center
+        self.msg_image_rect.center = self.rect.center
+
+    def draw_button(self):
+        # 绘制一个用颜色填充的按钮，再绘制文本
+        self.screen.fill(self.button_color, self.rect)
+        self.screen.blit(self.msg_image, self.msg_image_rect)