在使用form组件的模块引入如下模块：
import { FormsModule,ReactiveFormsModule } from '@angular/forms';
@NgModule({
imports: [
CommonModule,
FormsModule,
ReactiveFormsModule,
systemRouting
],212);">
declarations: [SystemComponent,RoleComponent,MenuComponent,RoleStaffComponent],212);">
exports:[
SystemComponent,212);">
RouterModule
})
