Javascript *ngFor 循环定义次数而不是重复数组的方法？
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Way to *ngFor loop defined number of times instead of repeating over array?
提问by Rodrigo Real
Is there a way to *ngFor loop a defined number of times instead of always having to iterate over an array?
有没有办法 *ngFor 循环定义的次数而不是总是必须遍历数组？
For example, I want a list to repeat 5 times, the loop would be something like that in C#;
例如，我想要一个列表重复 5 次，循环就像 C# 中的那样；
for (int i = 0; i < 4; i++){
}
Desired result:
想要的结果：
<ul>
<li><span>1</span></li>
<li><span>2</span></li>
<li><span>3</span></li>
<li><span>4</span></li>
<li><span>5</span></li>
</ul>
回答by Thierry Templier
Within your component, you can define an array of number (ES6) as described below:
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(0).map((x,i)=>i);
}
}
See this link for the array creation: Tersest way to create an array of integers from 1..20 in JavaScript.
有关创建数组的信息，请参阅此链接：在 JavaScript 中从 1..20 创建整数数组的最简单方法。
You can then iterate over this array with ngFor:
然后，您可以使用以下命令迭代此数组ngFor：
@View({
template: `
<ul>
<li *ngFor="let number of numbers">{{number}}</li>
</ul>
`
})
export class SampleComponent {
(...)
}
Or shortly:
或者很快：
@View({
template: `
<ul>
<li *ngFor="let number of [0,1,2,3,4]">{{number}}</li>
</ul>
`
})
export class SampleComponent {
(...)
}
Hope it helps you, Thierry
希望对你有帮助，蒂埃里
Edit: Fixed the fill statement and template syntax.
编辑：修复了填充语句和模板语法。
