Angular 2 - NgFor 使用数字代替集合

Question

...例如...

<div class="month" *ngFor="#item of myCollection; #i = index">
...
</div>

有可能做类似...

<div class="month" *ngFor="#item of 10; #i = index">
...
</div>

...无需诉诸非优雅的解决方案，例如:

<div class="month" *ngFor="#item of ['dummy','dummy','dummy','dummy','dummy',
'dummy','dummy','dummy']; #i = index">
...
</div>

?

Answer 1

在您的组件中，您可以定义一个数字数组 (ES6)，如下所述:

export class SampleComponent {
  constructor() {
    this.numbers = Array(5).fill().map((x,i)=>i); // [0,1,2,3,4]
    this.numbers = Array(5).fill(4); // [4,4,4,4,4]
  }
}

请参阅此链接以创建数组:Tersest way to create an array of integers from 1..20 in JavaScript .

然后您可以使用 ngFor 遍历此数组:

@Component({
  template: `
    <ul>
      <li *ngFor="let number of numbers">{{number}}</li>
    </ul>
  `
})
export class SampleComponent {
  (...)
}

或者很快:

@Component({
  template: `
    <ul>
      <li *ngFor="let number of [0,1,2,3,4]">{{number}}</li>
    </ul>
  `
})
export class SampleComponent {
  (...)
}