angularjs6说去表单的双向绑定

<form #myForm = "ngForm">
  <div class="form-group row">
    <label class="col-sm-2 col-form-label">&nbsp;</label>
    <div class="col-sm-10">
      <h1>登陆</h1>
    </div>
  </div>
  <div class="form-group row">
    <label for="inputPassword" class="col-sm-2 col-form-label">userName</label>
    <div class="col-sm-10">
      <input [(ngModel)]="user.username" name="username" class="form-control" id="username" placeholder="userName">

    </div>
  </div>
  <div class="form-group row">
    <label for="inputPassword" class="col-sm-2 col-form-label">Password</label>
    <div class="col-sm-10">
      <input type="password" [(ngModel)]="user.username" name="password" class="form-control" id="password" placeholder="Password">

    </div>
  </div>
  <div class="form-group row">
    <label class="col-sm-2 col-form-label">&nbsp;</label>
    <div class="col-sm-10">
      <button type="submit" (click)=" save(myForm.value)" class="btn btn-primary mb-2 form-control">提交</button>
    </div>
  </div>