Lua中的IO使用

最近写一个功能，需要写入本地缓存文件，记录一下Lua的IO用法：

local checkClickPath = Application.persistentDataPath.."/CheckClick.lua"

function MafiaPrequelProxy:CheckRoleClick(uId)--检测玩家id是否点击过
	local userStr = tostring(uId).."=false;"
	local newStr = ""
	
	file = io.open(checkClickPath, "r")
	
	if file ~= nil then--存在文件
		io.input(file)
		ioStr = io.read()
		io.close(file)
		local roleDataList = string.split(ioStr, ";")--玩家账号信息列表
		local isPlayerInList = false
		local isPlayerClick = false
		for i = 1,#roleDataList do
			local rData = string.split(roleDataList[i], "=")
			local rId = rData[1]
			local isClick = rData[2]
			if rId == tostring(uId) then
				isPlayerInList = true
				if isClick == "true" then
					isPlayerClick = true
				end
				break
			end
		end
		
		if isPlayerInList then--玩家信息在文件中
			newStr = ioStr
			return isPlayerClick, newStr
		else--玩家不在文件中，写入
			newStr = ioStr..userStr
			file = io.open(checkClickPath,"w+")
			io.output(file)
			file:write(newStr)
			io.close(file)
		end
		
	else--文件不存在
		file = io.open(checkClickPath,"w+")
		io.output(file)
		file:write(userStr)
		io.close(file)
		newStr = userStr
	end
	
	return false, newStr
end