为NG2标签输入设置ReadOnly，单位为角度

<input [(ngModel)]="inputValue" readonly>

inputValue: number = 0;

import { Component, HostListener } from '@angular/core';

@Component({
  selector: 'app-example',
  templateUrl: './example.component.html',
  styleUrls: ['./example.component.css']
})
export class ExampleComponent {
  inputValue: number = 0;

  @HostListener('keydown', ['$event'])
  onKeydown(event: KeyboardEvent) {
    event.preventDefault();
  }
}

<input [(ngModel)]="inputValue" readonly>
{{ inputValue | number:'1.0-2' }}°