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ERROR Error: formControlName must be used with a parent formGroup directive. You'll want to add a formGroup
directive and pass it an existing FormGroup instance (you can create one in your class).
Example:
<div [formGroup]="myGroup">
<input formControlName="firstName">
</div>
In your class:
this.myGroup = new FormGroup({
firstName: new FormControl()
});
情况一:没有FormGroup,使用FormControlName
情况二:有FormGroup,没有FormControlName而是使用[(ngModel)]
总而言之,FormGroup和FormControlName必须同时存在