从Node.js v0.12和Node.jsv4.0.0开始，有一个稳定的readline核心模块。这是从文件中读取行的最简单方法，而无需任何外部模块：
const fs = require('fs');const readline = require('readline');async function processLineByLine() { const fileStream = fs.createReadStream('input.txt'); const rl = readline.createInterface({ input: fileStream, crlfDelay: Infinity }); // Note: we use the crlfDelay option to recognize all instances of CR LF // ('rn') in input.txt as a single line break. for await (const line of rl) { // Each line in input.txt will be successively available here as `line`. console.log(`Line from file: ${line}`); }}processLineByLine();或者：
var lineReader = require('readline').createInterface({ input: require('fs').createReadStream('file.in')});lineReader.on('line', function (line) { console.log('Line from file:', line);});即使没有final，也可以正确读取最后一行（从Node v0.12或更高版本开始）
n。
更新
：此示例已添加到Node的API官方文档中。
