整理代码习惯，常量字符串改用单引号，可能有遗漏

parts/modes/defender_n.lua

@@ -24,23 +24,23 @@ return{
 						if D.wave<=90 then
 							D.rpm=math.floor(108e3/t)*.1
 							if D.wave==25 then
-								P:showTextF(text.great,0,-140,100,"appear",.6)
+								P:showTextF(text.great,0,-140,100,'appear',.6)
 								P.gameEnv.pushSpeed=2
 								P.dropDelay,P.gameEnv.drop=20,20
 							elseif D.wave==50 then
-								P:showTextF(text.awesome,0,-140,100,"appear",.6)
+								P:showTextF(text.awesome,0,-140,100,'appear',.6)
 								P.gameEnv.pushSpeed=3
 								P.dropDelay,P.gameEnv.drop=10,10
 							elseif D.wave==90 then
 								P.dropDelay,P.gameEnv.drop=5,5
-								P:showTextF(text.maxspeed,0,-140,100,"appear",.6)
+								P:showTextF(text.maxspeed,0,-140,100,'appear',.6)
 							end
 						end
 					end
 				end
 			end
 		end,
-		bg="rainbow2",bgm="storm",
+		bg='rainbow2',bgm='storm',
 	},
 	pauseLimit=true,
 	load=function()