设计模式-创建型模式-工厂模式（工厂三兄弟） TypeScript

简单工厂模式

定义一个接口，三个具体类。然后书写如下，通过选择，生产出相应的对象

// 定义Shape接口
interface Shape {draw():void;
}// 下面为产品类
// 产品 Circle
class Circle implements Shape{public constructor(){}public draw():void{}
}// 产品Rectangle
class Rectangle implements Shape{public constructor(){}public draw():void{}
}// 下面为生产产品的工厂，根据选择，生产出不同的产品
class ShapeFactory {constructor(){}public static getShape(typeShape:string):Shape{if(typeShape === "Circle"){return new Circle();}if (typeShape === "Rectangle"){return new Rectangle();}if (typeShape === null){return null;}return null;}
}// 下面编写测试
let test:Shape = ShapeFactory.getShape("Circle");
// 调用draw方法
test.draw();

编译后的js如下

// 下面为产品类
// 产品 Circle
var Circle = /** @class */ (function () {function Circle() {}Circle.prototype.draw = function () {};return Circle;
}());
// 产品Rectangle
var Rectangle = /** @class */ (function () {function Rectangle() {}Rectangle.prototype.draw = function () {};return Rectangle;
}());
// 下面为生产产品的工厂，根据选择，生产出不同的产品
var ShapeFactory = /** @class */ (function () {function ShapeFactory() {}ShapeFactory.getShape = function (typeShape) {if (typeShape === "Circle") {return new Circle();}if (typeShape === "Rectangle") {return new Rectangle();}if (typeShape === null) {return null;}return null;};return ShapeFactory;
}());
// 下面编写测试
var test = ShapeFactory.getShape("Circle");
// 调用draw方法
test.draw();

利用反射改进

class ShapeFactory1 {constructor(){};public static getShape<T extends Shape>(c:{new ():T}):T{    // C类型为类return new c();}
}
let test = ShapeFactory1.getShape(Circle);
test.draw();

var ShapeFactory1 = /** @class */ (function () {function ShapeFactory1() {};ShapeFactory1.getShape = function (c) {return new c();};return ShapeFactory1;
}());
var test = ShapeFactory1.getShape(Circle);
test.draw();

工厂方法

即，将工厂拆分

// 工厂方法
class CircleFactory{constructor(){}public static getShape():Shape{return new Circle();}
}
class RectangleFactory{constructor(){}public static getShape():Shape{return new Rectangle();}
}
let test = CircleFactory.getShape();
test.draw();

抽象工厂

抽象工厂比较简单不在阐述。
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