node.js readline和line-reader逐行读取文件方法_node.js_

const readline = require('readline');

const file = readline.createInterface({ input: fs.createReadStream('source_to_file'), output: process.stdout, terminal: false });

file.on('line', (line) => { console.log(line); });

 // Importing the Required Modules const fs = require('fs'); const readline = require('readline'); // Creating a readable stream from file // readline module reads line by line // but from a readable stream only. const file = readline.createInterface({ input: fs.createReadStream('gfg.txt'), output: process.stdout, terminal: false }); // Printing the content of file line by // line to console by listening on the // line event which will triggered // whenever a new line is read from // the stream file.on('line', (line) => { console.log(line); });

const fs = require('fs'); const readline = require('readline'); let rl = readline.createInterface({ input: fs.createReadStream("./11.txt") }) rl.on('line', line => { console.log(line); }) 

npm install line-reader --save

const lineReader = require('line-reader'); lineReader.eachLine('source-to-file', (line, last) => { console.log(line); });

// Importing required libraries const lineReader = require('line-reader'); // eachLine() method call on gfg.txt // It got a callback function // Printing content of file line by line // on the console lineReader.eachLine('gfg.txt', (line, last) => { console.log(line); }); 

const fs = require("fs"); let readStream = fs.createReadStream("./11.txt"); let writeStream = fs.createWriteStream("./11_11.txt"); let buffer = []; function writeFileWithLine(line, isLastLine) { writeStream.write('\t"'); writeStream.write(line); if (isLastLine) { writeStream.write('"\n') } else { writeStream.write('",\n'); } } writeStream.write("[\n"); readStream.on("readable", () => { while ((char = readStream.read(1)) !== null) { if (char[0] === 0x0a) { writeFileWithLine(Buffer.from(buffer).toString(), false); buffer.length = 0; } else { buffer.push(char[0]); } } }); readStream.on("end", () => { writeFileWithLine(Buffer.from(buffer).toString(), true); writeStream.write("]"); });