Question

我有以下代码：

<ng-container *ngFor="let item of items">
<div>{{item.subArray[0].attr1}}</div>
<div>{{item.subArray[0].attr2}}</div>
</ng-container>

有没有办法为item.subArray [0]创建变量，而不是一遍又一遍地访问第0个元素。例如：

<ng-container *ngFor="let item of items; let subItem = item.subArray[0]">
<div>{{subItem.attr1}}</div>
<div>{{subItem.attr2}}</div>
</ng-container>

Answer 1

是的，只需嵌套另一个迭代器：

<ng-container *ngFor="let item of items">
  <ng-container *ngFor="let subItem of item.subArray">
    <div>{{subItem.attr1}}</div>
    <div>{{subItem.attr2}}</div>
  </ng-container>
</ng-container>

Angular 4 ngFor变量保持值

1 个答案: