@parseDecorator delete(id: number) { ...... return this; } } var __esDecorate = (this && this.__esDecorate) || function (ctor, descriptorIn, decorators, contextIn, initializers, extraInitializers) { function ac
type Method = (this: unknown, ...arg: unknown[]) =>unknown;functionmethodDecorator(target: Method, context: ClassMemberDecoratorContext): Method {//target 就是当前被装饰的 class 方法const originalMethod =target;//定义一个新方法const decoratedMethod: Method =function(this, ...args) { console....
// 使用 webDecorator 修饰器来修饰 User 类 @webDecorator export class User { private name: string; constructor(name: string) { this.name = name; } } // 定义一个类修饰器, 只需要定义一个参数 function webDecorator<T extends { new (...args: any[]): {} }>( TargetConstructor:T ) { ...
function methodDecorator1(targetPrototype: any, methodName: string, descriptor: PropertyDescriptor) { console.log('方法装饰器1:', targetPrototype, methodName, descriptor); } let methodDecorator2: any = function (params: string) { console.log('方法装饰器2 before:', params); return function (tar...
function testable(target){ target.isTestable = true; // traget = MyTestableClass } console.log(MyTestableClass.isTestable) // true 1. 2. 3. 4. 5. 6. 7. 8. 为了更好的理解装饰器究竟是如何工作,我下载了typeScript并且开启了Decorator实验性功能,接着运行tsc命令,最终上述代码编译生成如下ES5代码...
log("I am parameter1 decorator"); } } function Param2Decorator() { return function (target, methodName: string, paramIndex: number) { console.log("I am parameter2 decorator"); } } function PropertyDecorator() { return function (target, propertyName: string) { console.log("I am ...
//PropertyDescriptor类型是ts内置的 function MethodsDecorator (target: Object, propertyKey: string, descriptor: PropertyDescriptor){ console.log(target) console.log(propertyKey) console.log(descriptor) } class Person { name: string = '' age: number = 0 constructor(name: string, age: number) { th...
官方文档类装饰器的定义如下: type ClassDecorator = <TFunction extends Function> (target: TFunction) => TFunction | void;接收一个函数,返回一个新的函数。类装饰器本身也是一个函数。 输入参数 t…
function classDecorator<T extends {new(...args:any[]):{}}>(constructor:T) { return class extends constructor { newProperty = "new property"; hello = "override"; } } @classDecorator class Greeter { property = "property"; hello: string; constructor(m: string) { this.hello = m; } }...
target: Employee { routine: [Function] } name: routine descriptor: { value: [Function], writable: true, enumerable: true, configurable: true } param: with param Daily routine 代码块 预览复制 可以看到,先执行装饰器函数,然后执行routine()函数。至于类属性装饰器函数表达式的三个参数target、name、desc...