Angular4_点击tr选中行

Angular4_点击tr选中行，并得到点击行的数量

<tr (click)="onselectedRows(hu,od)">

    <td style="background-color: white" (click)="expandOrder($event,od,hu.palletId)">

        <i [ngClass]="{'fa': true, 'fa-caret-right': !od.childexpanded,'fa-caret-down': od.childexpanded, 'fa-lg': true}"></i>

    </td>

    <td>

        <inputtype="checkbox"[(ngModel)]="od.selected"style="cursor:pointer;">

    </td>

    <td>{{od.delivery}}</td>

    <td>{{od.customer}}</td>

    <td>{{od.shipTo}}</td>

    <td>{{od.soNumber}}</td>

    <td>{{od.dispatchTime}}</td>

    <td>{{od.carrier}}</td>

</tr>

// ts事件

onselectedRows(hu: any, od: any) {

  od.selected = !od.selected;

  constindex = _.indexOf(this.selectedOrder, od);

  if (index !== -1) {

    this.selectedOrder.splice(index, 1);

  } else {

    this.selectedOrder.push(od);

  }

  if (this.selectedOrder.length === 1) {

    this.footerComponent.setButtonsStatus(false);

  } else {

    this.footerComponent.setButtonsStatus(true);

  }

}