javascript - nodejs createReadStream 从第n行开始

Question

为了使用 nodejs 逐行读取文本文件，我有以下代码:

var lineReader = require('readline').createInterface({
 input: require('fs').createReadStream('log.txt')
});
lineReader.on('line', function (line) {
  console.log(line);
});
lineReader.on('close', function() {
  console.log('Finished!');
});

有没有办法从特定行开始读取文件？

Answer 1

根据Node.js Docs您可以在创建流时同时指定 start 和 end 选项:

options can include start and end values to read a range of bytes from the file instead of the entire file. Both start and end are inclusive and start at 0

// get file size in bytes
var fileLength = fs.statSync('log.txt')['size'];
var lineReader = require('readline').createInterface({
 input: require('fs').createReadStream('log.txt', {
    // read the whole file skipping over the first 11 bytes
    start: 10
    end: fileLength - 1 
 })
});