1. class InjectionToken
1.1 InjectionToken 作用
创建在 DI provider 使用的token
Creates a token that can be used in a DI Provider.
1.2 InjectionToken 的类定义
export declare class InjectionToken<T> {
protected _desc: string;
readonly ngInjectableDef: never | undefined;
constructor(_desc: string, options?: {
providedIn?: Type<any> | 'root' | null;
factory: () => T;
});
toString(): string;
}
1.3 InjectionToken 的使用
const BaseURL = new InjectionToken<string>('des:base url');
const injector =
Injector.create({providers: [{provide: BaseURL, useValue:}]})
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