util.inspect.custom

• <symbol> 可用于声明自定义的检查函数。

除了可以通过 util.inspect.custom 访问之外，此符号是全局地注册，可以在任何环境中作为 Symbol.for('nodejs.util.inspect.custom') 访问。

const inspect = Symbol.for('nodejs.util.inspect.custom');

class Password {
  constructor(value) {
    this.value = value;
  }

  toString() {
    return 'xxxxxxxx';
  }

  [inspect]() {
    return `Password <${this.toString()}>`;
  }
}

const password = new Password('r0sebud');
console.log(password);
// 打印 Password <xxxxxxxx>

有关更多详细信息，请参阅对象上的自定义检查函数。

• <symbol> that can be used to declare custom inspect functions.

In addition to being accessible through util.inspect.custom, this symbol is registered globally and can be accessed in any environment as Symbol.for('nodejs.util.inspect.custom').

const inspect = Symbol.for('nodejs.util.inspect.custom');

class Password {
  constructor(value) {
    this.value = value;
  }

  toString() {
    return 'xxxxxxxx';
  }

  [inspect]() {
    return `Password <${this.toString()}>`;
  }
}

const password = new Password('r0sebud');
console.log(password);
// Prints Password <xxxxxxxx>

See Custom inspection functions on Objects for more details.