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API > @angular/core

ValueProvider

配置此 Injector 以返回令牌的值。

Configures the Injector to return a value for a token.

      
      interface ValueProvider extends ValueSansProvider {
  provide: any
  multi?: boolean

  // 继承自 core/ValueSansProvider
  useValue: any
}

参见

属性

属性说明
provide: any

注入令牌。通常是 Type 或 InjectionToken 的实例，但也可以是 any 实例。

An injection token. Typically an instance of Type or InjectionToken, but can be any.

multi?: boolean

如果为 true，则注入器返回实例数组。这对于允许多个提供者散布在多个文件中以向公共令牌提供配置信息很有用。

When true, injector returns an array of instances. This is useful to allow multiple providers spread across many files to provide configuration information to a common token.

使用说明

例子

Example

      
      const injector = Injector.create([{provide: String, useValue: 'Hello'}]);

expect(injector.get(String)).toEqual('Hello');

Multi-value example

      
      const locale = new InjectionToken<string[]>('locale');
const injector = Injector.create([
  {provide: locale, multi: true, useValue: 'en'},
  {provide: locale, multi: true, useValue: 'sk'},
]);

const locales: string[] = injector.get(locale);
expect(locales).toEqual(['en', 'sk']);