使用Node.js的readline模块。

var fs = require('fs');
var readline = require('readline');

var filename = process.argv[2];
readline.createInterface({
    input: fs.createReadStream(filename),
    terminal: false
}).on('line', function(line) {
   console.log('Line: ' + line);
});

使用BufferedReader，但函数应该是异步的:

var load = function (file, cb){
    var lines = [];
    new BufferedReader (file, { encoding: "utf8" })
        .on ("error", function (error){
            cb (error, null);
        })
        .on ("line", function (line){
            lines.push (line);
        })
        .on ("end", function (){
            cb (null, lines);
        })
        .read ();
};

load ("file", function (error, lines){
    if (error) return console.log (error);
    console.log (lines);
});

另一个答案是使用npm包。nexline包允许用户逐行异步读取文件:

"use strict";

import fs from 'fs';
import nexline from 'nexline';

const lines = [];
const reader = nexline({
    input: fs.createReadStream(`path/to/file.ext`)
});

while(true) {
    const line = await reader.next();
    if(line === null) break; // line is null if we reach the end
    if(line.length === 0) continue; // Ignore empty lines
    
    // Process the line here - below is just an example
    lines.push(line);
}

即使您的文本文件大于允许的最大字符串长度，这种方法也可以工作，从而避免“错误:不能创建超过0x1fffffe8个字符的字符串”错误。

这是@mtomis上面回答的一个变体。

它创建了一个行流。它发出'data'和'end'事件，允许您处理流的结束。

var events = require('events');

var LineStream = function (input) {
    var remaining = '';

    input.on('data', function (data) {
        remaining += data;
        var index = remaining.indexOf('\n');
        var last = 0;
        while (index > -1) {
            var line = remaining.substring(last, index);
            last = index + 1;
            this.emit('data', line);
            index = remaining.indexOf('\n', last);
        }
        remaining = remaining.substring(last);
    }.bind(this));

    input.on('end', function() {
        if (remaining.length > 0) {
            this.emit('data', remaining);
        }
        this.emit('end');
    }.bind(this));
}

LineStream.prototype = new events.EventEmitter;

用它来包装:

var lineInput = new LineStream(input);

lineInput.on('data', function (line) {
    // handle line
});

lineInput.on('end', function() {
    // wrap it up
});

js:

var array = fs.readFileSync('file.txt', 'utf8').split('\n');

ts:

var array = fs.readFileSync('file.txt', 'utf8').toString().split('\n');

使用Node.js的readline模块。

var fs = require('fs');
var readline = require('readline');

var filename = process.argv[2];
readline.createInterface({
    input: fs.createReadStream(filename),
    terminal: false
}).on('line', function(line) {
   console.log('Line: ' + line);
});