ErrorHandler
Provides a hook for centralized exception handling.
      
      class ErrorHandler {
  handleError(error: any): void
}
    说明
The default implementation of ErrorHandler prints error messages to the console. To intercept error handling, write a custom exception handler that replaces this default as appropriate for your app.
方法
使用说明
Example
      
      class MyErrorHandler implements ErrorHandler {
  handleError(error) {
    // do something with the exception
  }
}
@NgModule({
  providers: [{provide: ErrorHandler, useClass: MyErrorHandler}]
})
class MyModule {}