v-show切换显示图表组件

用v-show控制ucharts折线图显示隐藏 第一次仍然是空白
Hbulider X 2.6.5.20200314

<view class="hrecord" @click="showShade">历史记录</view>  
               <view  class="blindlist"  v-show="show">  
            <view class="hidelinecst">  
                <view class="linecst-list">  
                    <view class="linecst-title">  
                        <span>施工进度上报记录</span>  
                    </view>   
                    <view class="qiun-charts">  
                        <canvas canvas-id="canvasLineA" id="canvasLineA" class="charts"></canvas>  
                    </view>  
                </view>  
            </view>  
        </view>