如何在Angular中动态创建服务？

Question

I am trying to dynamically instantiate services during runtime given a string name (ie reflection). Something like:

let myService = new window[myClassName](myParams);

Or, alternatively:

let myService = Object.create(window[myClassName].prototype);
myService.constructor.apply(myService, myParams);

I have looked at Injector class, but it requires a type, instead of a string ( https://angular.io/api/core/Injector ) .

Any thoughts on how to accomplish this?

Answer 1

You can still use the Injector in combination with strings. It's just a matter of providing your providers in the way you want to use them. This is the example on the Angular page: https://angular.io/api/core/Injector#example-1 [provide: Square] is short for [provide: Square, useClass: Square] (you can use useFactory instead of useClass when you want to instantiate the service yourself) You can change the first param ( provide ) by basically any Symbol you want, so also string. Have a look at this POC I set up https://stackblitz.com/edit/angular-mg1ezb

Answer 2

你可以试试

instance = new window["yourClassName"]();