Can't bind to 'formGroup' since it isn't a known property of 'form'

在APP.module.ts中引入FormsModule, ReactiveFormsModule。

 import { BrowserModule } from '@angular/platform-browser';
 import { NgModule } from '@angular/core';
 import { FormsModule, ReactiveFormsModule } from '@angular/forms';

 import { AppComponent } from './app.component';
 import { CoreModule } from './core/core.module';
 import { LoginModule } from './login/login.module';
 import { AppRoutingModule } from './app.route.module';

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

特别注意：在HTML中一定不能用form，随便换一个单词myGroup就行。

[formGroup]="myGroup"

 <div class="login-wrap">
   <form [formGroup]="myGroup" (ngSubmit)="onSubmit(myGroup,$event)">
     <mat-card class="example-card">
       <mat-card-header><mat-card-title>登录</mat-card-title></mat-card-header>
       <mat-card-content>
         <mat-form-field>
           <input matInput placeholder="您的email" formControlName="email">
         </mat-form-field>
         <mat-form-field>
           <input matInput placeholder="您的密码" formControlName="password">
         </mat-form-field>
       </mat-card-content>
       <mat-card-actions>
         <button mat-raised-button type="submit">登录</button>
       </mat-card-actions>
       <mat-card-footer>
         <p>还没有账户？<a href="#">注册</a></p>
         <p>忘记密码？<a href="#">找回</a></p>
       </mat-card-footer>
     </mat-card>
   </form>
   <mat-card class="example-card">
     <mat-card-header>
       <mat-card-title>每日佳句</mat-card-title>
       <mat-card-subtitle>满足感是在于不断努力，而不是现有成就。全新努力就会胜利满满。</mat-card-subtitle>
     </mat-card-header>
     <img mat-card-image src="https://material.angular.io/assets/img/examples/shiba2.jpg" alt="Photo of a Shiba Inu">
     <mat-card-content>
       <p>
         The Shiba Inu is the smallest of the six original and distinct spitz breeds of dog from Japan.
         A small, agile dog that copes very well with mountainous terrain, the Shiba Inu was originally
         bred for hunting.
       </p>
     </mat-card-content>
   </mat-card>
 </div>