nodejs输入输出

demo.ts

import * as readline from 'readline';
import * as fs from 'fs';
import * as path from 'path';

function scan(): Promise<void> {
  return new Promise((resolve, reject) => {
    const rl = readline.createInterface({
      input: process.stdin,
      output: process.stdout,
    });
    // 提示，默认为 '>'
    rl.prompt();
    rl.on('line', (line) => {
      resolve(line);
      setTimeout(() => {
        rl.close();
      }, 500);
    });
    rl.on('close', () => {
      process.exit(0);
    });
  });
}

scan().then(data => {
  fs.appendFile(path.join(__dirname, 'hello.txt'), data, {
    encoding: 'utf8',
  }, (err) => {
    if (err) {
      throw err;
    }
    return this;
  });
}).then(() => {
  fs.readFile(path.join(__dirname, 'hello.txt'), (err, data) => {
    if (err) {
      throw err;
    } else {
      console.log(data.toString());
    }
  });
});