代码规范：把所有的tab换成空格

parts/backgrounds/tunnel.lua

@@ -8,36 +8,36 @@ local ring
 local t
 local W,H
 function back.init()
-	ring={}
-	t=26
-	back.resize(SCR.w,SCR.h)
+    ring={}
+    t=26
+    back.resize(SCR.w,SCR.h)
 end
 function back.resize(w,h)
-	W,H=w,h
+    W,H=w,h
 end
 function back.update(dt)
-	t=t-1
-	if t==0 then
-		t=rnd(26,62)
-		ins(ring,0)
-	end
-	for i=#ring,1,-1 do
-		ring[i]=ring[i]+dt
-		if ring[i]>3.55 then
-			rem(ring,i)
-		end
-	end
+    t=t-1
+    if t==0 then
+        t=rnd(26,62)
+        ins(ring,0)
+    end
+    for i=#ring,1,-1 do
+        ring[i]=ring[i]+dt
+        if ring[i]>3.55 then
+            rem(ring,i)
+        end
+    end
 end
 function back.draw()
-	gc.clear(.08,.08,.084)
-	gc.setColor(1,1,1,.1)
-	for i=1,#ring do
-		local r=ring[i]^2/12
-		gc.setLineWidth(30-15/(r+.5))
-		gc.rectangle('line',W*.5-W*r/2,H*.5-H*r/2,W*r,H*r)
-	end
+    gc.clear(.08,.08,.084)
+    gc.setColor(1,1,1,.1)
+    for i=1,#ring do
+        local r=ring[i]^2/12
+        gc.setLineWidth(30-15/(r+.5))
+        gc.rectangle('line',W*.5-W*r/2,H*.5-H*r/2,W*r,H*r)
+    end
 end
 function back.discard()
-	ring=nil
+    ring=nil
 end
 return back