javascript - typescript 如何给Class中所有参数加上可选？

Question

class A = {  a: numebr = 0;  b: string = 'aa';}class B extends A{  c:string = "2312"}

B继承A的时候是否可以将A中的参数快捷设置为可选？

使用type中的Partial<Type>方法不适用于Class

Answer 1

class A {  a: number = 0;  b: string = 'aa';}class B extends ({} as new () => Partial<A>) {  c: string = "2312"}

参考：StackOverflow - Typescript class extending Partial interface

Answer 2

class A {    a: number = 0;    b: string = 'aa';}interface AProps {    a?: number;    b?: string;}class B extends A {    c: string = "2312";    constructor(props?: AProps) {        super();        if (props) {            if (props.a !== undefined) this.a = props.a;            if (props.b !== undefined) this.b = props.b;        }    }}const obj = new B({ a: 5 });console.log(obj.a);  // 5console.log(obj.b);  // 'aa'console.log(obj.c);  // '2312'