<templat>
<select class="form-control" v-model="select" @click="showBranches(branch.id)" >
                <option value="">请选择</option>
                <option v-for="branch in option" :value="branch.value">{{branch.label}}</option>
            </select>
            </template>
        <script>
           export default {
            data() {
                return {
                    select: '',
                    option: [
                    {
                        value: 1,
                        label: 1
                    },
                    {
                        value: 2,
                        label: 2
                    },
                    {
                        value: 3,
                        label: 3
                    }
                ]
            }
        }
    } 
        </script>

请告诉我哪里不行 ?