如何在 mixin 中获取类名？

Question

如何在 mixin 类中定义的函数中获取使用 mixin 的类的名称，而不是 mixin 类本身的名称？

为了帮助澄清，这是我的代码：

// this function is from TypeScript mixin documentation
function applyMixins(derivedCtor: any, baseCtors: any[]) {
  baseCtors.forEach(baseCtor => {
    Object.getOwnPropertyNames(baseCtor.prototype).forEach(name => {
      derivedCtor.prototype[name] = baseCtor.prototype[name];
    });
  });
}

class ClassName {
  public getClassName(): string {
    var funcNameRegex = /function (.{1,})\(/;
    var results = (funcNameRegex).exec(this.constructor.toString());
    var className = (results && results.length > 1) ? results[1] : '';
    return className;
  }
}

class ExampleFoo implements ClassName {
  getClassName: () => string;
}

applyMixins(ExampleFoo, [ClassName]);

当我实例化 ExampleFoo 并调用 getClassName 时，它​​会打印出“ClassName”，但我需要它来打印出“ExampleFoo”：

console.log(new ExampleFoo().getClassName()) // => prints "ClassName"

Answer 1

我建议不要复制构造函数。将函数applyMixins 替换为：

function applyMixins(derivedCtor: any, baseCtors: any[]) {
  baseCtors.forEach(baseCtor => {
    Object.getOwnPropertyNames(baseCtor.prototype).forEach(name => {
      if (name !== 'constructor')
        derivedCtor.prototype[name] = baseCtor.prototype[name];
    });
  });
}