angular-cn/aio/content/cheatsheet/class-decorators.md

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@cheatsheetSection Class decorators @cheatsheetIndex 5 @description {@target ts}import { Directive, ... } from '@angular/core';{@endtarget} {@target js}Available from the ng.core namespace{@endtarget}

@cheatsheetItem syntax(ts): @Component({...}) class MyComponent() {}|@Component({...}) syntax(js): var MyComponent = ng.core.Component({...}).Class({...})|ng.core.Component({...}) description: Declares that a class is a component and provides metadata about the component.

@cheatsheetItem syntax(ts): @Directive({...}) class MyDirective() {}|@Directive({...}) syntax(js): var MyDirective = ng.core.Directive({...}).Class({...})|ng.core.Directive({...}) description: Declares that a class is a directive and provides metadata about the directive.

@cheatsheetItem syntax(ts): @Pipe({...}) class MyPipe() {}|@Pipe({...}) syntax(js): var MyPipe = ng.core.Pipe({...}).Class({...})|ng.core.Pipe({...}) description: Declares that a class is a pipe and provides metadata about the pipe.

@cheatsheetItem syntax(ts): @Injectable() class MyService() {}|@Injectable() syntax(js): var OtherService = ng.core.Class( {constructor: function() { }}); var MyService = ng.core.Class( {constructor: [OtherService, function(otherService) { }]});|var MyService = ng.core.Class({constructor: [OtherService, function(otherService) { }]}); description: {@target ts}Declares that a class has dependencies that should be injected into the constructor when the dependency injector is creating an instance of this class. {@endtarget} {@target js} Declares a service to inject into a class by providing an array with the services, with the final item being the function to receive the injected services. {@endtarget}