JavaScript无法一次接收一行子流

Question

[在Node中使用child_process.spawn时，它会生成一个子进程并自动创建stdin，stdout和stderr流以与chil进行交互。

const child = require('child_process');
const subProcess = child.spawn("python", ["myPythonScript.py"])

subProcess.stdout.on('data', function(data) {
  console.log('stdout: ' + data); 
});

因此，在我的项目中实现了这一点，但事实是，子进程仅在缓冲区达到一定大小时才实际在输出流上写入。而不是当缓冲区设置有数据（无论数据大小如何）时。确实，我想在子流程输出流写入输出流时直接接收它，而不是在它填满整个缓冲区时接收。任何解决方案？

Answer 1

我认为您需要readline。

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
  // ('\r\n') 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();

来自https://nodejs.org/api/readline.html#readline_example_read_file_stream_line_by_line