VIP30/Ts-类/js/3_多态.js

var __extends = (this && this.__extends) || (function () {
    var extendStatics = function (d, b) {
        extendStatics = Object.setPrototypeOf ||
            ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
            function (d, b) { for (var p in b) if (Object.prototype.hasOwnProperty.call(b, p)) d[p] = b[p]; };
        return extendStatics(d, b);
    };
    return function (d, b) {
        if (typeof b !== "function" && b !== null)
            throw new TypeError("Class extends value " + String(b) + " is not a constructor or null");
        extendStatics(d, b);
        function __() { this.constructor = d; }
        d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
    };
})();
// 多态： 父类型的引用指向了子类型的对象 ，不同类型的对象针对相同的方法，产生了不同的行为
(function () {
    //定义一个父类
    var Animal = /** @class */ (function () {
        //定义一个构造函数
        function Animal(name) {
            this.name = name;
        }
        //方法
        Animal.prototype.run = function (distance) {
            if (distance === void 0) { distance = 0; }
            console.log("run " + distance + " far away", this.name);
        };
        return Animal;
    }());
    //定义一个子类
    var Dog = /** @class */ (function (_super) {
        __extends(Dog, _super);
        //构造函数
        function Dog(name) {
            //调用父类的构造函数 实现子类中属性的初始化操作
            return _super.call(this, name) || this;
        }
        //实例的方法
        Dog.prototype.run = function (distance) {
            if (distance === void 0) { distance = 10; }
            console.log("run " + distance + " far away", this.name);
        };
        return Dog;
    }(Animal));
    var Pig = /** @class */ (function (_super) {
        __extends(Pig, _super);
        //构造函数
        function Pig(name) {
            return _super.call(this, name) || this;
        }
        Pig.prototype.run = function (distance) {
            if (distance === void 0) { distance = 20; }
            console.log("run " + distance + " far away", this.name);
        };
        return Pig;
    }(Animal));
    //实例化父类的对象
    var ani = new Animal('动物');
    ani.run();
    //实例化子类对象
    var dog = new Dog('大黄');
    dog.run();
    var pig = new Pig('佩奇');
    pig.run();
    /* 父类和子类的关系  可以通过父类的类型 创建子类的类型 */
    var dog1 = new Dog('小黄');
    var pig1 = new Pig('乔治');
    dog1.run();
    pig1.run();
    /* 函数 */
    function showRun(ani) {
        ani.run();
    }
    showRun(dog1);
    showRun(pig1);
})();