classApiClient{privatereadonly baseUrl="https://api.example.com/";// 推断类型: "https://api.example.com/"get(endpoint:string){// ...
The members of a class (properties & methods) are typed using type annotations, similar to variables. ExampleGet your own TypeScript Server classPerson { name: string; } constperson =newPerson(); person.name="Jane"; Try it Yourself » ...
letpasscode="Hello TypeScript";classEmployee{private_fullName:string;getfullName():string{returnthis._fullName;}setfullName(newName:string){if(passcode&&passcode=="Hello TypeScript"){this._fullName=newName;}else{console.log("Error: Unauthorized update of employee!");}}}letemployee=newEmployee(...
abstractclassAnimal{constructor(publicname:string){this.name=name}abstractgetName()//不包含方法体}classCatextendsAnimal{getName() {returnthis.name}// 子类实现抽象方法}constcat=newCat('kitty')console.log(cat.getName())// kitty 高级技巧 类定义会创建两个东西:类的实例类型和一个构造函数。 类定义...
classPoint{publicx:number=0publicy:number=0constructor(x:number, y:number){this.x = x;this.y = y; } }// 无法从对象中删除某个属性,从而确保所有Point对象都具有属性xletp1 =newPoint(1.0,1.0);deletep1.x;// 在TypeScript和ArkTS中,都会产生编译时错误delete(p1asany).x;// 在TypeScript中不...
Back when TypeScript first introduced index signatures, you could only get properties declared by them with “bracketed” element access syntax like person["name"]. Copy interface SomeType { /** This is an index signature. */ [propName: string]: any; } function doStuff(value: SomeType) {...
The problem is using them interchangeably is that super only works on members declared on the prototype — not instance properties. That means that if you wrote super.someMethod(), but someMethod was defined as a field, you’d get a runtime error! Copy class Base { someMethod = () => ...
class Employee { private _fullName: string; get fullName(): string { return this._fullName; } set fullName(newName: string) { if (passcode && passcode == "Hello TypeScript") { this._fullName = newName; } else { console.log("Error: Unauthorized update of employee!"); ...
/*** Represents a book in the catalog.* @public*/export class Book {/*** The title of the book.* @experimental*/public get title(): string;/*** The author of the book.*/public get author(): string;}; 在这个例子中,Book.author从包含它的类继承了它的@public名称,而Book.title被标记...
泛型泛型主要是为了解决类型复用的问题。可以说泛型给了你在使用 ts 类型检测的体验同时,又提供了很好的类型扩展性、可维护性。在使用泛型类型时,可以将泛...