读写文件的模式：
复制代码 代码如下:
r - 读取模式w - 写入模式(覆盖现有内容)
a - 附加模式(附加在现有内容之后)
b - 二进制模式
r+ - 读取更新模式(现有数据保留)
w+ - 写入更新模式(现有数据擦除)
a+ - 附加更新模式(现有数据保留，只在文件末尾附加)

do --read data from file function readFile() local fileHandle = assert(io.open("test.txt", "r"), "not the file"); if fileHandle then local outData = fileHandle:read("*all"); print(outData); else print("false"); end fileHandle:close(errorInfo); end --write data to the file function writeFile(dataBuffer) local writeHandle = assert(io.open("write.txt", "a+"), "not the file"); if writeHandle then writeHandle:write(dataBuffer); print("true"); else print("false"); end writeHandle:close(); end local inputData = 0; repeat inputData = io.read(); --write the data from io writeFile(inputData); until inputData == '#' end