完善自定义tabbar的业务逻辑，但发现了Android和iOS的v-show bug

pages/template/custom-tab-bar/custom-tab-bar-tab1.uvue

@@ -24,6 +24,7 @@
     },
     created() {
       this.loadData()
+      console.log("tab1 created");
     },
     methods: {
       loadData() {
@@ -40,6 +41,7 @@
       },
       scrollTop(top : number) {
         (this.$refs["listView"] as UniElement).scrollTop = top
+        console.log("tab1 to top");
       }
     }
   }