angular - 输入类型 ="number"不能以 Angular 形式工作

Question

我有以下代码

<div class="container">
<form>
    <div class="form-group">
        <input type="number" class="form-control" id="hours" name="hours" 
                [(ngModel)]="hours">

                {{hours}}
        <label for="hours">hr</label>
    </div>

    <div class="form-group">
        <input type="number" class="form-control" id="minutes" name="minutes" 
                [(ngModel)]="minutes">

                {{minutes}}
        <label for="minutes">min</label>
    </div>

    <div class="form-group">
        <input type="number" class="form-control" id="seconds" name="seconds" 
                [(ngModel)]="seconds">

                {{seconds}}
        <label for="seconds">sec</label>
    </div>
</form>

出于某种原因，只有最后一个输入有效，小时和分钟都无效。我只检查了 html 文件，这似乎有效，而且我能够在所有字段中输入。但在使用 Angular 时不是。

Angular 组件类

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

@Component({
  selector: 'app-pomodoro',
  templateUrl: './pomodoro.component.html',
  styleUrls: ['./pomodoro.component.css']
})
export class PomodoroComponent implements OnInit {
  @Input() private hours: Number;
  @Input() private minutes: Number;
  @Input() private seconds: Number;

  constructor() {

  }

  ngOnInit() {
  }

}

Answer 1

从 @Input() 属性声明中删除 private。

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

    @Component({
      selector: 'app-pomodoro',
      templateUrl: './pomodoro.component.html',
      styleUrls: ['./pomodoro.component.css']
    })
    export class PomodoroComponent implements OnInit {
      @Input() hours: Number;
      @Input() minutes: Number;
      @Input() seconds: Number;

      constructor() {

      }

      ngOnInit() {
      }

    }