.．.例如……
<div class="month" *ngFor="#item of myCollection; #i = index">
...
</div>
有可能做一些像……
<div class="month" *ngFor="#item of 10; #i = index">
...
</div>
.．.不诉诸于不优雅的解决方案，比如:
<div class="month" *ngFor="#item of ['dummy','dummy','dummy','dummy','dummy',
'dummy','dummy','dummy']; #i = index">
...
</div>
?
当前回答
My-component.ts
numbers: number[] = [];
constructor() {
this.numbers = new Array<number>(10)
}
My-component.html
<div *ngFor="let num of numbers; let i = index">{{ i }}</div>
其他回答
由于不带参数的fill()方法(在已接受的答案中提到过)会抛出错误，我建议这样做(对我有用，Angular 7.0.4, Typescript 3.1.6)
<div class="month" *ngFor="let item of items">
...
</div>
在组件代码中:
this.items = Array.from({length: 10}, (v, k) => k + 1);
我用Angular 5.2.6和TypeScript 2.6.2解决了这个问题:
class Range implements Iterable<number> {
constructor(
public readonly low: number,
public readonly high: number,
public readonly step: number = 1
) {
}
*[Symbol.iterator]() {
for (let x = this.low; x <= this.high; x += this.step) {
yield x;
}
}
}
function range(low: number, high: number) {
return new Range(low, high);
}
它可以像这样在组件中使用:
@Component({
template: `<div *ngFor="let i of r">{{ i }}</div>`
})
class RangeTestComponent {
public r = range(10, 20);
}
为了简洁，故意省略错误检查和断言(例如，如果step为负会发生什么)。
<div *ngFor="let number of [].constructor(myCollection)">
<div>
Hello World
</div>
</div>
这是一个在myCollection中重复相同次数的好方法。
如果myCollection是5,Hello World会重复5次。
这也可以像这样实现:
HTML:
<div *ngFor="let item of fakeArray(10)">
...
</div>
打字稿:
fakeArray(length: number): Array<any> {
if (length >= 0) {
return new Array(length);
}
}
演示工作
你也可以用like that
export class SampleComponent {
numbers:Array<any> = [];
constructor() {
this.numbers = Array.from({length:10},(v,k)=>k+1);
}
}
HTML
<p *ngFor="let i of numbers">
{{i}}
</p>
