如果我们需要获取对象中的所有键,并根据这些键获取对应的值,可以使用Object.keys()方法。以下是一个示例: // 定义一个对象constperson={name:"John",age:30,gender:"male"};// 使用 Object.keys() 获取对象的所有键constkeys=Object.keys(person);// 遍历所有键,并获取对应的值keys
1.object 类型 object 类型是:TypeScript 2.2 引入的新类型,它用于表示非原始类型。 2.Object 类型 Object 类型:它是所有 Object 类的实例的类型,它由以下两个接口来定义: Object 接口定义了 Object.prototype 原型对象上的属性; ObjectConstructor 接口定义了 Object 类的属性。 Object 类的所有实例都继承了 Objec...
target: Object - 被装饰的类 propertyKey: string | symbol - 方法名 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 ${paramete...
typeCheckKey<T, Kextendskeyof T> = Kextends'name'?true:false;interfacePerson {name:string;age:number;}typeIsNameKey = CheckKey<Person,'name'>;// Result: truetypeIsCityKey = CheckKey<Person,'city'>;// Result: false 在此示例中,CheckK...
Object 表示拥有toString、hasOwnProperty方法的的类型,所以所有的原始类型、非原始类型都可以赋值给Object(严格模式下null和undefined不可以) 代码语言:javascript 代码运行次数:0 运行 AI代码解释 let object: Object; object = 1;//正确 object = 'tiantian';//正确 object = true;//正确 object = null;//错误...
大Object :代表所有拥有 toString、hasOwnProperty 方法的类型,所以所有原始类型、非原始类型都可以赋给 Object,严格模式下不包括null,undefined。{}空对象类型和大 Object 一样。 let obj1: Object = 3; let obj2: Object = "3"; let obj6: Object = Symbol(); ...
getOwnMetadataKeys(target, propertyKey); 如果不传入属性名称,那么查询的是 person 对象自己的元数据。 // 源码 function getMetadata(metadataKey, target, propertyKey) { if (!IsObject(target)) throw new TypeError(); if (!IsUndefined(propertyKey)) propertyKey = ToPropertyKey(propertyKey); return...
If your package has typings specified using thetypesortypingskey in itspackage.json, the npm registry will display that the package has available bindings like so: If you still can't find the typings, just look for any ".d.ts" files in the package and manually include them with a/// ...
Most ts-node options can be specified in a "ts-node" object using their programmatic, camelCase names. We recommend this because it works even when you cannot pass CLI flags, such as node --require ts-node/register and when using shebangs. Use --skipProject to skip loading the tsconfig...
"use strict";varSubscription_1 =require('rxjs/Subscription');varFoo = (function(){functionFoo(){ } Foo.prototype.sayHi =function(name){return"Hi "+ name +", welcome to Salsa!"; };returnFoo; }()); exports.sqr =function(x){returnx * x; };Object.defineProperty(exports,"...