我有以下模板：
<div *ngFor="let item of myArray | customPipe1 | customPipe2; let l = length">
Here is the length of my ngFor : {{l}}
</div>
<div *ngFor="let item of myArray | customPipe1 | customPipe2 as result">
Here is the length of my ngFor : {{result.length}}
</div>
