Angular---can't bind to 'ngModel' since it isn't a know property of 'input'

Angular2在雙向數據綁定時，拋出如下問題：

can't bind to 'ngModel' since it isn't a know property of 'input'

解決辦法：

在app.module.ts文件中，

import { FormsModule } from '@angular/forms';

向其應用模塊@NgModule({})的imports:[]添加

FormsModule

具體如圖所示：