折叠面板点击之后没有响应

        <uni-collapse-item  show-animation="true" :ref="add" open="true" title="展开">  
            <view class="uni-list" style="padding: 30upx;">  
                <checkbox-group @change="checkboxChange">  
                    <label class="uni-list-cell uni-list-cell-pd" v-for="item in items" :key="item.value">  
                        <view>  
                            <checkbox :value="item.value" :checked="item.checked" />  
                        </view>  
                        <view>{{item.name}}</view>  
                    </label>  
                </checkbox-group>  
            </view>  
        </uni-collapse-item>  
    </uni-collapse>