这可能有助于看看在transpiled代码巴贝尔输出:
'use strict';
var _get = function get(_x, _x2, _x3) { var _again = true; _function: while (_again) { var object = _x, property = _x2, receiver = _x3; desc = parent = getter = undefined; _again = false; var desc = Object.getOwnPropertyDescriptor(object, property); if (desc === undefined) { var parent = Object.getPrototypeOf(object); if (parent === null) { return undefined; } else { _x = parent; _x2 = property; _x3 = receiver; _again = true; continue _function; } } else if ('value' in desc) { return desc.value; } else { var getter = desc.get; if (getter === undefined) { return undefined; } return getter.call(receiver); } } };
var _createClass = (function() { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ('value' in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; })();
function _inherits(subClass, superClass) { if (typeof superClass !== 'function' && superClass !== null) { throw new TypeError('Super expression must either be null or a function, not ' + typeof superClass); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, enumerable: false, writable: true, configurable: true } }); if (superClass) subClass.__proto__ = superClass; }
function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError('Cannot call a class as a function'); } }
var Parent = (function() {
function Parent() {
_classCallCheck(this, Parent);
}
_createClass(Parent, [{
key: 'yell',
value: function yell() {
console.log('yell');
}
}]);
return Parent;
})();
var Child = (function (_Parent) {
function Child() {
_classCallCheck(this, Child);
if (_Parent != null) {
_Parent.apply(this, arguments);
}
}
_inherits(Child, _Parent);
_createClass(Child, [{
key: 'shout',
value: function shout() {
_get(Object.getPrototypeOf(Child.prototype), 'yell', this).call(this);
}
}]);
return Child;
})(Parent);
这里有一些重要的事情:
- 你定义的方法添加到类的原型
- 儿童原型是父类
- 的实例调用超从原型
因此,为了抓住相同名称的功能打电话喊你可以做的几件事情之一:
Object.getPrototypeOf(Object.getPrototypeOf(_Child)).yell.call(_Child)
或
Object.getPrototypeOf(Child.prototype).yell.call(_Child)
或者,我建议这一个:
Parent.prototype.yell.call(_Child)
'Child'不是'Child'和'super'的一个实例是不是一个性质。你想'新的孩子()。yell()'? – Ryan
哎呀,是的,让我解决这个问题。编辑:好吧,那工作。谢谢! – Salar
'super'特别的,非常像'this'。这不是实例的属性。从工程角度来看,这也没什么意义。调用者不应该假设某个对象的继承链。它应该只关心它的接口。 –