navbar优化

src/components/NavBar/index.vue

@@ -36,7 +36,7 @@
             <span @click="handleToPage(item.path)">{{ item.name }} </span>
             <i
               v-if="item.name == '陈列展览'"
-              :class="currentTab.name=='陈列展览'?'el-icon-arrow-up':'el-icon-arrow-down'"
+              class="el-icon-arrow-down"
               style="transform: translate(30%, 30%); cursor: pointer"
             ></i>
           </div>