将项目悬停以显示其特定的div

你可以试试这样的

  <div class="card item" *ngFor="let deal of deals; let i = index">
      <div  (mouseenter) ="onHover(i)"  (mouseleave) ="onHover(-1)>
       <div *ngIf = "i == hoverIndex" class="card-body item-body">...</div>
      </div >
    </div>

在你的.ts文件中

hoverIndex:number = -1;

方法呢

onHover(i:number){
 this.hoverIndex = i;
}