控制台

🌐 Console

源代码: lib/console.js

node:console 模块提供了一个简单的调试控制台，类似于网页浏览器提供的 JavaScript 控制台机制。

🌐 The node:console module provides a simple debugging console that is similar to the JavaScript console mechanism provided by web browsers.

该模块导出两个特定组件：

🌐 The module exports two specific components:

• Console 类有一些方法，例如 console.log()、console.error() 和 console.warn()，可以用于写入任何 Node.js 流。
• 一个全局 console 实例，配置为写入 process.stdout 和 process.stderr。全局 console 可以在不调用 require('node:console') 的情况下使用。

警告: 全局 console 对象的方法既不像它们类似的浏览器 API 那样始终是同步的，也不像其他所有 Node.js 流那样始终是异步的。有关更多信息，请参见 关于进程I/O的说明。

🌐 Warning: The global console object's methods are neither consistently synchronous like the browser APIs they resemble, nor are they consistently asynchronous like all other Node.js streams. See the note on process I/O for more information.

使用全局 console 的示例：

🌐 Example using the global console:

console.log('hello world');
// Prints: hello world, to stdout
console.log('hello %s', 'world');
// Prints: hello world, to stdout
console.error(new Error('Whoops, something bad happened'));
// Prints error message and stack trace to stderr:
//   Error: Whoops, something bad happened
//     at [eval]:5:15
//     at Script.runInThisContext (node:vm:132:18)
//     at Object.runInThisContext (node:vm:309:38)
//     at node:internal/process/execution:77:19
//     at [eval]-wrapper:6:22
//     at evalScript (node:internal/process/execution:76:60)
//     at node:internal/main/eval_string:23:3

const name = 'Will Robinson';
console.warn(`Danger ${name}! Danger!`);
// Prints: Danger Will Robinson! Danger!, to stderr 拷贝

使用 Console 类的示例：

🌐 Example using the Console class:

const out = getStreamSomehow();
const err = getStreamSomehow();
const myConsole = new console.Console(out, err);

myConsole.log('hello world');
// Prints: hello world, to out
myConsole.log('hello %s', 'world');
// Prints: hello world, to out
myConsole.error(new Error('Whoops, something bad happened'));
// Prints: [Error: Whoops, something bad happened], to err

const name = 'Will Robinson';
myConsole.warn(`Danger ${name}! Danger!`);
// Prints: Danger Will Robinson! Danger!, to err 拷贝