fix: 修复生产环境中底部栏无法固定在视口底部的bug

src/views/Main.vue

@@ -3,7 +3,7 @@
     <!-- <keep-alive> -->
       <router-view ></router-view>
     <!-- </keep-alive> -->
-    <van-tabbar route>
+    <van-tabbar route class="tabbar">
       <van-tabbar-item  v-for="{ text, path, icon} in tabList" :key="text" v-bind="to(path)">
         <span>{{text}}</span>
         <template #icon="props">
@@ -54,3 +54,8 @@ export default class Main extends Vue {
   }
 }
 </script>
+<style scoped>
+.tabbar{
+  position: fixed;
+}
+</style>