Angular 2:如何编写 for 循环,而不是 foreach 循环
问题描述:
使用 Angular 2,我想多次复制模板中的一行.迭代一个对象很容易,*ngFor="let object of objects"
.但是,我想运行一个简单的 for
循环,而不是一个 foreach
循环.类似(伪代码):
Using Angular 2, I want to duplicate a line in a template multiple times. Iterating over an object is easy, *ngFor="let object of objects"
. However, I want to run a simple for
loop, not a foreach
loop. Something like (pseudo-code):
{for i = 0; i < 5; i++}
<li>Something</li>
{endfor}
我该怎么做?
答
如果将 int
传递给 Array
,则可以实例化具有给定条目数的空数组> 构造函数,然后通过 ngFor
对其进行迭代.
You can instantiate an empty array with a given number of entries if you pass an int
to the Array
constructor and then iterate over it via ngFor
.
在您的组件代码中:
export class ForLoop {
fakeArray = new Array(12);
}
在您的模板中:
<ul>
<li *ngFor="let a of fakeArray; let index = index">Something {{ index }}</li>
</ul>
索引属性为您提供迭代次数.
The index properties give you the iteration number.