node.js readline和line-reader逐行读取文件方法

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("]");
});