modify channel scrollnav

 <template>
   <LayoutApp class="yohoufo-channel-page" :show-back="true" :hide-header="hideHeader" :title="title">
-      <div class="fixed-nav scroll-nav-wrap" v-if="isShow && navList.length">
+      <div class="fixed-nav scroll-nav-wrap" :class="{'hidden': !isShow}" v-if="navList.length">
         <ScrollNav :list="navList" :current="active" @transfer="getIndex" style="background: #f2f2f2;"></ScrollNav>
       </div>
       <Scroll
@@ -63,10 +63,6 @@ export default {
       homeYasParams: [],
       options: {
         pullUpLoad: true,
-        // pullDownRefresh: true,
-        // pullDownRefresh: {
-        //   txt: '刷新成功',
-        // }
       },
       scrollEvents: ['scroll','scroll-end'],
       title:'闲鱼潮',
@@ -109,6 +105,7 @@ export default {
       selectedCategory: {},
       height: 0,
       isA: false,
+      isHidden: true,
     };
   },
   computed: {
@@ -511,4 +508,8 @@ input::-webkit-input-placeholder {
 .class-a {
   padding-top: 104px;
 }
+.hidden {
+  visibility: hidden;
+  opacity: 0;
+}
 </style>