class Point { x: number; y: number; // Normal signature with defaults constructor(x = 0, y = 0) { this.x = x; this.y = y; }} class Point { // Overloads constructor(x: number, y: string); constructor(s: string); constructor(xs: any, y?: any) { ...
Ts扩展了js类,包括类型参数(type parameters)、实现子语句(implements clauses)、可访问性修饰符(accessibility modifiers)、成员变量声明(member variable declarations)和构造器参数特性声明(parameter property declarations in constructors)。 8.1 类声明(Class Declarations) 类声明声明一个类类型(class type)和一个构造...
classPoint{x:number;y:number;// Normal signature with defaultsconstructor(x =0, y =0) {this.x= x;this.y= y; } } classPoint{// Overloadsconstructor(x:number, y:string);constructor(s:string);constructor(xs:any, y?:any) {// TBD} } 但类构造函数签名与函数签名之间也有一些区别: 构...
class MyClass { private value: number; private name: string; // 构造函数重载签名 constructor(); constructor(value: number); constructor(name: string); constructor(valueOrName?: number | string) { if (typeof valueOrName === 'number') { this.value = valueOrName; this.name = 'defaultNa...
classPoint{// Overloadsconstructor(x:number,y:string);constructor(s:string);constructor(xs:any,y?:any){// TBD}} super 调用 如果有基类,必须在构造函数中调用super,且在使用this之前 代码语言:javascript 复制 classBase{k=4;}classDerivedextendsBase{constructor(){// Prints a wrong value in ES5; ...
title = constructorexample; } } 14、调试 用TypeScript编写的代码很容易调试。 15、TypeScript只是JavaScript TypeScript始于JavaScript,止于JavaScript。Typescript采用JavaScript中程序的基本构建块。为了执行的目的,所有类型脚本代码都转换为其JavaScript等效代码。 例如: class Greeter { greeting: string; constructor ...
class BasicCalculator { public constructor(protected value: number = 0) { } public currentValue(): number { return this.value; } // 返回 this 类型， public add(operand: number): this { this.value += operand; return this; } public multiply(operand: number):...
Search Terms superclass base class generic type infer contextual infer parent generic super constructor Suggestion Make it possible to infer superclass type parameters / constructor overload from the super call Use Cases I'm working on a...
class Person { constructor(age: number) {this.age =age; } name: string= ''; age: number; method(param1: string): string {return''; } } JS 以外的类型 除了JS 的类型外, TS 扩展了很多很多的类型 void TypeScript 用 void 来表示函数没有返回值. ...
class Container { private val: number; constructor(val: number) { this.val = val; } map(cb: (x: number) => number): this { this.val = cb(this.val); return this; } log(): this { console.log(this.val); return this;