修改

src/pages/DeviceScreen.vue

@@ -25,9 +25,9 @@
               <div id="echart_d01" style="width: 100%; height: 100%"></div>
             </div>
             <div class="total">
-              <div>{{totalNum}}<span>台</span></div>
+              <div v-if="totalNum">{{totalNum}}<span>台</span></div>
             </div>
-            <div class="total-desc">设备总数</div>
+            <div v-if="totalNum" class="total-desc">设备总数</div>
           </div>
           <div class="item_5_r">
             <div class="right_1_down_inner_3_i"  v-for="(e, i) in arrR01" :key="i">