接口的继承与实现：
interface A{
save(o:any):void;
select();
update();
delete();
}
interface B extends A{
count():number;
page();
}
class User implements B {
count(): number {
throw new Error('Method not implemented.');
}
page() {
throw new Error('Method not implemented.');
}
save(o: any): void {
throw new Error('Method not implemented.');
}
select() {
throw new Error('Method not implemented.');
}
update() {
throw new Error('Method not implemented.');
}
delete() {
throw new Error('Method not implemented.');
}
constructor(parameters) {
}
}
接口的多实现：
interface A{
save(o:any):void;
select();
update();
delete();
}
interface B {
count():number;
page();
}
class User1 implements B,A {
count(): number {
throw new Error('Method not implemented.');
}
page() {
throw new Error('Method not implemented.');
}
save(o: any): void {
throw new Error('Method not implemented.');
}
select() {
throw new Error('Method not implemented.');
}
update() {
throw new Error('Method not implemented.');
}
delete() {
throw new Error('Method not implemented.');
}
constructor(parameters) {
}
}接口的多继承：
interface A{
save(o:any):void;
select();
update();
delete();
}
interface X{
x();
}
// 接口多继承
interface B extends A,X{
count():number;
page();
}
class User2 implements B {
x() {
throw new Error('Method not implemented.');
}
count(): number {
throw new Error('Method not implemented.');
}
page() {
throw new Error('Method not implemented.');
}
save(o: any): void {
throw new Error('Method not implemented.');
}
select() {
throw new Error('Method not implemented.');
}
update() {
throw new Error('Method not implemented.');
}
delete() {
throw new Error('Method not implemented.');
}
constructor(parameters) {
}
}
扩展：
// TS中
class Point2D {
x:number;
y:number;
}
// 接口继承类
interface Point3D extends Point2D{
z:number;
}
let a:Point3D={x:1,y:2,z:3};//创建对象，未调用构造器
let a1:Point2D=new Point2D();//类实例化
// let a3:Point3D=new Point3D();//接口不能实例化
文章为作者独立观点，不代表 股票程序化软件自动交易接口观点
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