问Vue2为其他每个选择生成的select触发器事件

EN

    <div v-for="(inv, index) in pendingInvitations" :key="index" class="columns is-desktop">
        <div class="column is-4">{{inv.email}}</div>
        <div class="column is-4">
            <b-field class="mb-5">
                <b-select v-if="invitationRoles" 
                          :input="changeInvitationRole(index)" 
                          v-model="pendingInvitations[index].role" 
                          :placeholder="role">
                    <option v-for="(value, key) in invitationRoles"
                            :key="key"
                            :value="value">
                        {{ value }}
                    </option>
                </b-select>
            </b-field>
        </div>
    </div>

    ...

    changeInvitationRole(index){
        console.log(index);
    },