修复一些背景相关问题，框架跟进

parts/scenes/app_dtw.lua

@@ -199,8 +199,7 @@ local scene={}
 
 function scene.sceneInit()
     reset()
-    BG.set('fixColor')
-    BG.send(.26,.26,.26)
+    BG.set('fixColor',.26,.26,.26)
     BGM.play(bgm)
 end
 

parts/scenes/app_mahjong.lua

@@ -106,8 +106,7 @@ end
 local scene={}
 
 function scene.sceneInit()
-    BG.set('fixColor')
-    BG.send(.26,.62,.26)
+    BG.set('fixColor',.26,.62,.26)
     _newGame()
     selected=false
 end

parts/scenes/app_tap.lua

@@ -12,8 +12,7 @@ function scene.sceneInit()
     lastKey=nil
     speed=0
     keyTime={}for i=1,40 do keyTime[i]=-1e99 end
-    BG.set('fixColor')
-    BG.send(.26,.26,.26)
+    BG.set('fixColor',.26,.26,.26)
     BGM.play('push')
 end
 

parts/scenes/setting_video.lua

@@ -97,7 +97,14 @@ scene.widgetList={
         },
     WIDGET.newSlider{name='bgAlpha',      x=1020,y=1430,w=200,
         axis={0,.8},disp=SETval('bgAlpha'),
-        code=function(v)SETTING.bgAlpha=v BG.send(v,v,v)end,
+        code=function(v)
+            SETTING.bgAlpha=v
+            if BG.cur=='fixColor' then
+                BG.send(v,v,v)
+            else
+                BG.send(v)
+            end
+        end,
         hideF=function()return SETTING.bg=='on'end
         },