1 <li *ngFor="let menu of menus; let i = index"> 2 <a href="#" [class.active]="i == selectedIndex" (click)="selectedIndex =i" >{{menu.title}}2</a> 3 4 </li>
css:
点击标题变色
原文：https://www.cnblogs.com/sulanlan/p/11444749.html
