ng: Can't bind to 'ngModel' since it isn't a known property of 'input'. - Angular 6

【出現的問題】ng: Can't bind to 'ngModel' since it isn't a known property of 'input'.

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【解決方法】導入 FormsModule 到 app.module.ts （如下代碼粉色標記）

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';

import { AppComponent } from './app.component';
import { OrderComponent } from './order/order.component';
import {FormControl, FormsModule} from '@angular/forms';

@NgModule({
  declarations: [
    AppComponent,
    OrderComponent
  ],
  imports: [
    BrowserModule,
    FormsModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

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【參考】

https://stackoverflow.com/questions/38880150/angular-2-cant-bind-to-ngmodel-since-it-isnt-a-known-property-of-input