class - 接口(interface)和类中的函数重载 - 怎么做？

Question

我有这个界面:

interface IPoint {
    getDist(): string;
    getDist(x: number): any;
}

我需要一个类来实现它，但我无法获得正确的语法来实现 getDist() 方法 在类里面..

class Point implements IPoint {
    // Constructor
    constructor (public x: number, public y: number) { }

    pointMethod() { }

    getDist() {
        Math.sqrt(this.x * this.x + this.y * this.y);
    }
    // Static member
    static origin = new Point(0, 0);
}

它说:

Class 'Point' declares interface 'IPoint' but does not implement it: Types of property 'getDist' of types 'Point' and 'IPoint' are incompatible:Call signatures of types '() => void' and '{ (): string; (x: number): any; }' are incompatible

执行此操作的正确方法是什么？

谢谢

Answer 1

当你在类中声明函数时，你需要用重载来装饰它:

getDist(): string;
getDist(x: number): any;
getDist(x?: number): any {
    // your code
 }