class Animal { name: string; constructor(theName: string) { this.name = theName; } move(distanceInMeters: number = 0) { console.log(`${this.name} moved ${distanceInMeters}m.`); } } class Snake extends Animal { constructor(name: string) { super(name); } move(distanceInMeters = ...
classPerson{name:string;constructor(name:string){this.name=name;}}typePersonInstance=InstanceType<typeofPerson>;// PersonInstance 的类型为 Person 在上述代码中,InstanceType<typeof Person>获取了构造函数 Person 的实例类型。 Awaited<T> 用于获取 Promise 类型 T 的解析值类型。它会创建一个新的类型,其中包...
instanceof类型守卫:使用instanceof操作符可以检查对象的原型链,确定对象是否属于某个类或构造函数的实例。例如: class Person {name: string;constructor(name: string) {this.name = name;}}function greet(person: Person | string): void {if (person instanceof Person) {console.log(`Hello, ${person.name...
string; //姓名age: number; //年龄constructor(name, age, id) {this.id = id;this.name = name;this.age = age;}}interface IbaseCRUD<T> {data: T[];add: (t: T) => void;getById: (id: number) => T;}// 管理工具类// 实例化这个类我就可以拿到一个工具对象用来管理东西class UserCRU...
console.log(Hello, my name is ${this.name} and I am ${this.age} years old.); }} // Creating an instance of the Person classconst john = new Person(“Kwame”, 25);john.greet(); // Output: Hello, my name is Kwame and I am 25 years old.在上面的示例中,我们定义了一个名为“...
classCatextendsAnimal{ dump() { console.log(this.AnimalName); } } let cat =newCat("catname"); cat.AnimalName;// 受保护的对象,报错cat.run;// 正常cat.age =2;// 正常 在面向对象中,有一个比较重要的概念就是抽象类,抽象类用于类的抽象,可以定义一些类的公共属性、公共方法,让继承的子类去实现...
publicgetName(): string { returnthis.name; } } constperson =newPerson("Jane"); console.log(person.getName());// person.name isn't accessible from outside the class since it's private Try it Yourself » Thethiskeyword in a class usually refers to the instance of the class. Read mo...
class Octopus { readonly name: string; readonly numberOfLegs: number = 8; constructor (theName: string) { this.name = theName; } } let dad = new Octopus("Man with the 8 strong legs"); dad.name = "Man with the 3-piece suit"; // 错误! name 是只读的. 参数属性 在上面的例子中...
\n\n> 需要额外注意的是只有function、class和interface可以直接默认导出,其他的变量需要先定义出来,再默认导出。\n\n###export =\n\n当然,我们上述提到的都是关于 ESM 相关的类型声明文件。\n\nTS 中的类型声明文件同样为我们提供了使用export =的 CJS 模块相关语法:\n\nts\n// types/axios.d.ts\nexport...
class OKGreeter { // Not initialized, but no error name!: string; } readonly 只读属性,不多介绍,只能读取不能赋值。 注意:构造函数内可以赋值 代码语言:javascript 代码运行次数:0 运行 AI代码解释 class Greeter { readonly name: string = "world"; constructor(otherName?: string) { if (otherNam...