appendfile

Replace a line in txt file using JavaScript

由 萝らか妹 提交于 2020-06-13 00:35:52
问题 I am trying to simply replace a line in a text file using JavaScript. The idea is: var oldLine = 'This is the old line'; var newLine = 'This new line replaces the old line'; Now i want to specify a file, find the oldLine and replace it with the newLine and save it. Anyone who can help me here? 回答1: This should do it var fs = require('fs') fs.readFile(someFile, 'utf8', function (err,data) { var formatted = data.replace(/This is the old line/g, 'This new line replaces the old line'); fs

Replace a line in txt file using JavaScript

由 耗尽温柔 提交于 2020-06-13 00:35:13
问题 I am trying to simply replace a line in a text file using JavaScript. The idea is: var oldLine = 'This is the old line'; var newLine = 'This new line replaces the old line'; Now i want to specify a file, find the oldLine and replace it with the newLine and save it. Anyone who can help me here? 回答1: This should do it var fs = require('fs') fs.readFile(someFile, 'utf8', function (err,data) { var formatted = data.replace(/This is the old line/g, 'This new line replaces the old line'); fs

Replace a line in txt file using JavaScript

由 匆匆过客 提交于 2020-06-13 00:35:12
问题 I am trying to simply replace a line in a text file using JavaScript. The idea is: var oldLine = 'This is the old line'; var newLine = 'This new line replaces the old line'; Now i want to specify a file, find the oldLine and replace it with the newLine and save it. Anyone who can help me here? 回答1: This should do it var fs = require('fs') fs.readFile(someFile, 'utf8', function (err,data) { var formatted = data.replace(/This is the old line/g, 'This new line replaces the old line'); fs

NodeJS笔记: 文件操作大全

由 断了今生、忘了曾经 提交于 2019-12-18 18:27:03
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 文件I/O fs模块的基本用法 开发中我们经常会有文件I/O的需求，node.js中提供一个名为fs的模块来支持I/O操作，fs模块的文件I/O是对标准POSIX函数的简单封装。 writeFile函数的基本用法 文件I/O，写入是必修课之一。fs模块提供writeFile函数，可以异步的将数据写入一个文件, 如果文件已经存在则会被替换。用法如下： 例： fs.writeFile(filename, data, callback) var fs= require("fs"); fs.writeFile('test.txt', 'Hello Node', function (err) { if (err) throw err; console.log('Saved successfully'); //文件被保存 }); appendFile函数的基本用法 writeFile函数虽然可以写入文件，但是如果文件已经存在，我们只是想添加一部分内容，它就不能满足我们的需求了，很幸运，fs模块中还有appendFile函数，它可以将新的内容追加到已有的文件中，如果文件不存在，则会创建一个新的文件。使用方法如下： 例： fs.appendFile(文件名,数据,编码,回调函数(err)); var fs= require(

Append one file into another file

由 社会主义新天地 提交于 2019-12-13 09:40:13
问题 I've been working on this for a bit and all the examples I've found have been to append a given string into the file, but I haven't been able to find any luck with appending a whole file at the end of a file. Everything's been using .appendAllText or appendText which doesn't suit my needs. My files are .sgm . In my code I first grab all the sgm files, then I check if that file ends with _Ch#. I'm ready to append the file to the master, but so far all I've been able to do is append the string

Append data to file with firefox extension

由 我与影子孤独终老i 提交于 2019-12-11 02:13:44
问题 I'm trying to build a firefox extension and i want to write things periodically in a file. So i want a file in which i append new strings. The following code writes the file but at the end the file contains only the last string i wrote and not the previous. Can you help me? mydir=null; mylog=null; mystream=null; function initFolder() { var dirSvc = Components.classes["@mozilla.org/file/directory_service;1"] .getService(Components.interfaces.nsIProperties); mydir = dirSvc.get("ProfD",
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