JavaScript 中带有 `super` 关键字的多级对象继承

Question

我想将多个对象合二为一。 super 关键字应该调用相应的父对象方法。如果父类的方法不存在，它应该调用下一个父类的方法等等。

抛出的示例代码：

var base = {
  runBusinessLogic() {
    console.log('BASE');
  }
}

var concrete = {

  unrelatedExtraMethod() {
  }
}

var addon = {
  runBusinessLogic() {
    super.runBusinessLogic(); // I expect this super call to call base.runBusinessLogic(..)
    console.log('ADDON');
  }
}

var layer2 = Object.setPrototypeOf(concrete, base);
var layer3 = Object.create(layer2, addon);

layer3.runBusinessLogic(); // throws "TypeError: layer3.runBusinessLogic is not a function"

我希望 layer3.runBusinessLogic(..) 调用 base.runBusinessLogic(..) 并且自身仍然有可调用的 unrelatedExtraMethod。

如何使 super 关键字按概述工作？

Answer 1

    var base = {
      runBusinessLogic() {
        console.log('BASE');
      }
    }

    var concrete = {

      unrelatedExtraMethod() {
      }
    }

    var addon = {
      runBusinessLogic() {
        super.runBusinessLogic(); // I expect this super call to call base.runBusinessLogic(..)
        console.log('ADDON');
      }
    }

    var layer2 = Object.setPrototypeOf(concrete, base);
    var layer3 = Object.setPrototypeOf(addon, layer2); // change this

    layer3.runBusinessLogic()

JavaScript 中带有 `super` 关键字的多级对象继承

Multi-level object inheritance in JavaScript with `super` keyword

javascript

inheritance