TypeScript Object 对象解构 代码语言:javascript 代码运行次数:0 运行 AI代码解释 let person = { name: 'Semlinker', gender: 'male' }; let {name, gender} = person; 对象展开运算符 代码语言:javascript 代码运行次数:0 运行 AI代码解释 let person = { name: 'Semlinker', gender: 'male', address...
typeReadonlyObject<T>={readonly[PinkeyofT]:T[P];};constobj:ReadonlyObject<{name:string;age:number}>={name:"Alice",age:20,};obj.name="Bob";// Error: Cannot assign to 'name' because it is a read-only property. 类型守卫 类型守卫是 TypeScript 中一种用于缩小类型范围的机制。通过使用类...
2. interface和class 我们知道,不算symbol,js中有6种基本类型,number,string,boolean,null, undefined, object。但是只依靠这几种类型,来描述某个函数需要传什么样的参数,是远远不够的,这也是interface的使命--描述一个值(value)的形状(type)。 现在我们来看class,class首先也具有interface的能力,描述一个形状,或者...
Object.defineProperty(target, key, { get: getter, set: setter, enumerable: true, configurable: true }); } class Person { @logProperty public name: string; constructor(name : string) { this.name = name; } } const p1 = new Person("semlinker"); p1.name = "kakuqo"; 以上代码我们定义...
1、定义私有属性的类 Class with a private property class CNY { private __brand: void ...
}lettom:Person= {name:'Tom',age:25,gender:'male'};// index.ts(9,5): error TS2322: Type '{ name: string; age: number; gender: string; }' is not assignable to type 'Person'.// Object literal may only specify known properties, and 'gender' does not exist in type 'Person'. ...
/*** Parses a JSON file.** @param path - Full path to the file.* @returns An object containing the JSON data.** @example Parsing a basic JSON file** # Contents of `file.json`* ```json* {* "exampleItem": "text"* }* ```** # Usage* ```ts* const result = parseFile("...
*/names: string[];/** 用于指定精确字符串值的字符串文字,使用联合类型将它们连接在一起 */status: "waiting" | "success";/** 任何对象,只要你不使用它的属性(不常见,但用作占位符)*/obj: object;obj2: {}; // 和 `object` 差不多,和 `Object` 完全一样/** 具有任意数量属性的对象 (...
classX{publicname:string=''}letx: X = {name:'x'};console.log(x.name);lety = ['a','b','c'];console.log(y[2]);// 在需要通过非标识符(即不同类型的key)获取数据的场景中,使用Map< Object, some_type >。letz =newMap<Object,string>(); ...
args: any[]) => T function withStyles<T extends AbstractConstructor<object>>(Ctor: T) { abstract class StyledClass extends Ctor { getStyles() { // ... } } return StyledClass; } class SubClass extends withStyles(SuperClass) { someMethod() { this.someMethod() } } Note that withStyles ...