refs https://www.tutorialsteacher.com/typescript/typescript-readonly https://mariusschulz.com/blog/read-only-properties-in-typescript
interfacePoint{x:number;y:number;}interfaceFrozenPoint{readonly x:number;readonly y:number;}functionfreezePoint(p:Point):FrozenPoint{returnObject.freeze(p);}constorigin=freezePoint({x:0,y:0});// Error! Cannot assign to 'x' because it// is a constant or a read-only property.origin.x=4...
TypeScript AST -> JavaScript 源码 显示注解类型,语法:value:type告诉类型检查器,这个 value 类型是 type。请看示例: <template> <p>{{ a }}</p> <p>{{ b }}</p> <p>{{ c }}</p> </template> <script lang="ts"setup name="App">//显示注解类型let a: number =1//a 是数字let b:st...
G2 Version: 3.5.7 Platform: Chrome Mini Showcase(like screenshots): CodePen Link: 直接在 Angular 中使用 G2 import * as G2 from '@antv/g2' 会出现这个错误。 开发环境没有问题,打包之后报错。 尝试多个版本都有这个问题。 初步判断是经过 TS 编译后出现的问题
result.hasOwnProperty(id)) { (<any>result)[id] = (<any>second)[id]; } } return result; } class Person { constructor(public name: string) { } } interface Loggable { log(): void; } class ConsoleLogger implements Loggable { log() { // ... } } var jim = extend(new Person(...
interface Person { readonly name: string; age?: number; } 只读属性用于限制只能在对象刚刚创建的时候修改其值。此外 TypeScript 还提供了 ReadonlyArray<T> 类型,它与 Array<T> 相似,只是把所有可变方法去掉了,因此可以确保数组创建后再也不能被修改。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 ...
class Animal {private name: string;public constructor(theName: string) {this.name = theName}public move(distanceInMeters: number) {console.log(`${this.name} moved ${distanceInMeters}m.`);}}let a = new Animal("动物")console.log(a.name) // Property 'name' is private and only accessib...
To define readonly properties in TypeScript, we prefix the property name with the readonly keyword. The encapsulating entity may be a class or an interface in TypeScript. class MyClass { readonly propertyName: type; } You can replace MyClass with the name of your class, propertyName with...
TypeScript Version: 2.0.3 Code // This works as expected class Demo1 { get foo() { return 'hi'; } } let d1 = new Demo1(); d1.foo = 'wat'; // An error is given (as it should be) because foo is read-only. // This does NOT work as expected ...
p.summary = "summary1"; // 会报错 Cannot assign to 'summary' because it is a read-only property. // 动态成员:一般用于动态对象,比如缓存对象 interface MyCache { // 这里 prop 只是一种代指,不是固定 [prop: string]: string } const cache: MyCache = {}; ...