class GenericNumber<T> { zeroValue: T; add: (x: T, y: T) => T; } let myGenericNumber = new GenericNumber<number>(); myGenericNumber.zeroValue = 0; myGenericNumber.add = function(x, y) { return x + y; }; 使用示例 代码语言:javascript 代码运行次数:0 运行 AI代码解释 interface...
AI代码解释 // 变量declareletuserName:string;declareconstwx:any;// 函数、函数重载declarefunctiongetName(uid:number):string;declarefunctiongetName():string;declarefunctiongetName(cb:()=>any):any;// 类declareclassCourse{cid:number;constructor(cid){};getCoursePrice():number;}// 枚举declareenumStatus...
interfaceShape{name:string;width:number;height:number;color?:string;}functionarea(shape:Shape){vararea=shape.width*shape.height;return"I'm "+shape.name+" with area "+area+" cm squared";}console.log(area({name:"rectangle",width:30,height:15}));console.log(area({name:"square",width:30,...
编译后生成的 JavaScript 代码如下:var Site = /** @class */ (function () { function Site() { } Site.prototype.name = function () { console.log("Runoob"); }; return Site; }()); var obj = new Site(); obj.name();执行以上 JavaScript 代码,输出结果如下:Runoob...
let functionLogged = key || target.prototype.constructor.name; console.log(`The parameter in position ${parameterIndex} at ${functionLogged} has been decorated`); } class Greeter { greeting: string; constructor(@Log phrase: string) {
function add(x: number, y: number): number { return x + y; } let myAdd = function(x: number, y: number): number { return x + y; }; 我们可以给每个参数添加类型之后再为函数本身添加返回值类型。 TypeScript能够根据返回语句自动推断出返回值类型,因此我们通常省略它。
classAnimals{publicname:string|undefined;constructor(name:string) {this.name= name; }eat() {console.log(`${this.name}哇`); } } 转换成 es5 代码 "use strict";varAnimals=/**@class*/(function() {functionAnimals(name) {this.name= name; ...
//Property 'name' has no initializer and is not definitely assigned in the constructor. } class GoodGreeter { name: string; constructor() { this.name = "hello"; } } 请注意,该字段需要在构造函数本身中进行初始化。 TypeScript 不会分析你从构造函数调用的方法来检测初始化,因为派生类可能会覆盖这...
在类名的右侧 <T> // T K V2）使用泛型: 类体中3）指定泛型的具体类型: 创建类的实例时, 类名的右侧 <具体类型>class GenericData<T> {zeroValue: T;add: (x: T, y: T) => T;}const genericNumber = new GenericData<number>();genericNumber.zeroValue = 4;genericNumber.add = function (...
class Snake extends Animal { constructor(name: string) { super(name); } move(distanceInMeters= 5) { console.log("Slithering..."); super.move(distanceInMeters); } } class Horse extends Animal { constructor(name: string) { super(name); } ...