subprocess.stdio

• 类型：<Array>

一个稀疏的管道数组用于子进程，与你传递给 child_process.spawn() 的 stdio 选项中被设置为 'pipe' 值的位置对应。subprocess.stdio[0]、subprocess.stdio[1] 和 subprocess.stdio[2] 也可以分别作为 subprocess.stdin、subprocess.stdout 和 subprocess.stderr 使用。

【A sparse array of pipes to the child process, corresponding with positions in the stdio option passed to child_process.spawn() that have been set to the value 'pipe'. subprocess.stdio[0], subprocess.stdio[1], and subprocess.stdio[2] are also available as subprocess.stdin, subprocess.stdout, and subprocess.stderr, respectively.】

在以下示例中，只有子进程的文件描述符 1（标准输出）被配置为管道，因此只有父进程的 subprocess.stdio[1] 是一个流，数组中的其他值都是 null。

【In the following example, only the child's fd 1 (stdout) is configured as a pipe, so only the parent's subprocess.stdio[1] is a stream, all other values in the array are null.】

const assert = require('node:assert');
const fs = require('node:fs');
const child_process = require('node:child_process');

const subprocess = child_process.spawn('ls', {
  stdio: [
    0, // Use parent's stdin for child.
    'pipe', // Pipe child's stdout to parent.
    fs.openSync('err.out', 'w'), // Direct child's stderr to a file.
  ],
});

assert.strictEqual(subprocess.stdio[0], null);
assert.strictEqual(subprocess.stdio[0], subprocess.stdin);

assert(subprocess.stdout);
assert.strictEqual(subprocess.stdio[1], subprocess.stdout);

assert.strictEqual(subprocess.stdio[2], null);
assert.strictEqual(subprocess.stdio[2], subprocess.stderr);import assert from 'node:assert';
import fs from 'node:fs';
import child_process from 'node:child_process';

const subprocess = child_process.spawn('ls', {
  stdio: [
    0, // Use parent's stdin for child.
    'pipe', // Pipe child's stdout to parent.
    fs.openSync('err.out', 'w'), // Direct child's stderr to a file.
  ],
});

assert.strictEqual(subprocess.stdio[0], null);
assert.strictEqual(subprocess.stdio[0], subprocess.stdin);

assert(subprocess.stdout);
assert.strictEqual(subprocess.stdio[1], subprocess.stdout);

assert.strictEqual(subprocess.stdio[2], null);
assert.strictEqual(subprocess.stdio[2], subprocess.stderr);拷贝

subprocess.stdio 属性可能是 undefined，如果子进程无法成功启动。

【The subprocess.stdio property can be undefined if the child process could not be successfully spawned.】