你可以通过在构造函数参数前添加一个可见性修饰符 publicprivateprotected或者 readonly来创建参数属性，最后这些类属性字段也会得到这些修饰符：class Params { constructor( public readonly x: number, protected y: number, private z: number ) {
"); }} class Derived extends Base { // Make this parameter required greet(name: string) {// Property 'greet' in type 'Derived' is not assignable to the same property in base type 'Base'. // Type '(name: string) => void' is not assignable to type '() => void'. cons...
classMyClass{privatestaticx=0;}console.log(MyClass.x);// Property 'x' is private and only accessible within class 'MyClass'.复制代码 静态成员也可以被继承: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 classBase{staticgetGreeting(){return"Hello world";}}classDerivedextendsBase{myGreeting=...
parameterIndex: number - 方法中参数的索引值 function Log(target: Function, key: string, parameterIndex: number) { let functionLogged = key || target.prototype.constructor.name; console.log(`The parameter in position ${parameterIndex} at ${functionLogged} has been decorated`); } class Greeter ...
class NameChecker implements Checkable { check(s) { // Parameter 's' implicitly has an 'any' type. // Notice no error here return s.toLowercse() === "ok"; // any } 在这个例子中,我们可能会以为s的类型会被check的name: string参数影响。实际上并没有,implements语句并不会影响类的内部是...
TypeScript(和 JavaScript) 并没有名为静态类(static class)的结构,但是像 C# 和 Java 有。 所谓静态类,指的是作为类的静态成员存在于某个类的内部的类。比如这种: // java public class OuterClass { private static String a = "1"; static class InnerClass { ...
class Animal { name: string; constructor(name: string) { this.name = name; } } class Dog extends Animal { bark() { console.log('Woof!'); } } function makeSound(animal: Animal) { if (animal instanceof Dog) { animal.bark(); // Type: Dog } else { console.log('Unknown animal'...
{return other.content === this.content;}}class DerivedBox extends Box {otherContent: string = "?";}const base = new Box();const derived = new DerivedBox();derived.sameAs(base);// Argument of type 'Box' is not assignable to parameter of type 'DerivedBox'.// Property 'otherContent'...
classMyClass{[s:string]:boolean|((s:string)=>boolean);check(s:string){returnthis[s]asboolean;}} 因为索引签名类型也需要捕获方法的类型,这使得并不容易有效的使用这些类型。通常的来说,在其他地方存储索引数据而不是在类实例本身,会更好一些。
TypeScript provides a convenient way to define class members in the constructor, by adding a visibility modifiers to the parameter. Example classPerson { // name is a private member variable publicconstructor(privatename: string) {} publicgetName(): string { ...