vue v-for 下拉框点击事件

 <div id="chart-shopname" class="chart-shopname">
          <select v-model="selected" @change="changeShop">
            <option disabled value="">请选择</option>
            <option   v-for="(store,index) in secondSummary.t0RealtimeStoreList" :value="store.shopName">{{store.shopName}}</option>
          </select>
        </div>

 changeShop(){
                this.secondSummary.t0RealtimeStoreList.forEach(item=>{
                    if(this.selected === item.shopName){
                      this.secondSummary20 = item.totalTop20Prod;
                    }
                })
            },