整理代码，继续减少单双引号混用

Zframework/stringExtend.lua

@@ -4,12 +4,12 @@ local find,sub,upper=string.find,string.sub,string.upper
 
 do--function STRING.shiftChar(c)
 	local shiftMap={
-		["1"]="!",["2"]="@",["3"]="#",["4"]="$",["5"]="%",
-		["6"]="^",["7"]="&",["8"]="*",["9"]="(",["0"]=")",
-		["`"]="~",["-"]="_",["="]="+",
-		["["]="{",["]"]="}",["\\"]="|",
-		[";"]=":",["'"]="\"",
-		[","]="<",["."]=">",["/"]="?",
+		['1']='!',['2']='@',['3']='#',['4']='$',['5']='%',
+		['6']='^',['7']='&',['8']='*',['9']='(',['0']=')',
+		['`']='~',['-']='_',['=']='+',
+		['[']='{',[']']='}',['\\']='|',
+		[';']=':',['\'']='"',
+		[',']='<',['.']='>',['/']='?',
 	}
 	function STRING.shiftChar(c)
 		return shiftMap[c]or upper(c)
@@ -59,7 +59,7 @@ end
 
 do--function STRING.urlEncode(str)
 	local rshift=bit.rshift
-	local b16={[0]="0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f"}
+	local b16={[0]='0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'}
 	function STRING.urlEncode(str)
 		local out=""
 		for i=1,#str do