$event

<select class="tl-select" name='make' [ngModel]="people.opt_user_id" (change)="isPushChoice(i.product_id,i.activity_id,people.opt_user_id,$event)">
                                                <!--<option *ngFor="let item of kindList ;let k = index"  [value]='item.id'>{{item.name}}</option>-->
                                                <!--(ngModelChange)="isPushChoice(i.product_id,i.activity_id,people.opt_user_id,k.user_id)"-->
                                                <option class="tl-option" *ngFor="let k of clerks; let j = index" value="{{k.user_id}}">
                                                    {{k.showName}}
                                                </option>
                                            </select>

event.target.value

isPushChoice(pid: any,acId: any,oldId:number,event?:HTMLSelectElement): void {
        //this.nowModelData.is_push = Number(val);
        let productId = Number(pid);
        let activityId = Number(acId);
        let tempOldId = Number(oldId);
        let tempNewId = Number(event.target.value);
        //console.log('clerks',this.clerks);
        
    }