如何利用Node.JS做文本逐行读写，方法及代码是什么-群英

上一篇：Node.JS中http表单提交的方法及实现是怎样的下一篇：如何Node.JS递归创建目录的实现是什么

今天就跟大家聊聊有关“如何利用Node.JS做文本逐行读写，方法及代码是什么”的内容，可能很多人都不太了解，为了让大家认识和更进一步的了解，小编给大家总结了以下内容，希望这篇“如何利用Node.JS做文本逐行读写，方法及代码是什么”文章能对大家有帮助。

利用nodejs实现：逐行读写（从一个文件逐行复制到另外一个文件）；逐行读取、处理和写入（读取一行，处理后，写入另一个文件）

1.所需要的模块： fs，os，readline

2.具体实现：

　a. 功能的实现：readWriteFileByLine.js

var fs = require('fs-extra'); var os = require('os'); var rl =  require('readline'); /** * 按行读写，无读取内容的处理，类似单纯的复制功能 * @param {string} readName * @param {string} writeName */
var readWriteFileByLine = function(readName, writeName){ var readStream = fs.createReadStream(readName); var writeStream = fs.createWriteStream(writeName); var readLine = rl.createInterface({ input: readStream, output: writeStream, terminal: true }) } /** * 按行读写，中间包涵对读取的行内容的处理 * @param {string} readName * @param {string} writeName * @param {Function} callback */
var readWriteFileByLineWithProcess = function(readName,writeName,callback){ var readStream = fs.createReadStream(readName); var writeStream = fs.createWriteStream(writeName); var readLine = rl.createInterface({ input: readStream }) readLine.on('line',function(line){ var rs = callback(line); writeStream.write(rs + os.EOL); }) } exports.readWriteFileByLine = readWriteFileByLine; exports.readWriteFileByLineWithProcess = readWriteFileByLineWithProcess

　　b. 功能的调用：index.js

var rwByLine = require('./lib/readWriteFileByLine.js') //按行读写，对行做字符替换处理
var readName = './obj.txt'; var writeName = './rt.txt'; rwByLine.readWriteFileByLineWithProcess(readName,writeName,function(line){ var rs = line.toString().replace("\\",'\/'); return rs; }) //按行读写，无处理
readName = './obj.txt'; writeName = './rt1.txt'; rwByLine.readWriteFileByLine(readName,writeName);