modify channel isShow init

@@ -130,6 +130,9 @@ export default {
     'channelList.list': function() {
       this.init();
     },
+    'isShow': function() {
+      this.init();
+    },
     navList() {
       this.$nextTick(() => {
         this.refreshProductList(this.active);
@@ -321,12 +324,8 @@ export default {
       if (this.navTop) {
         if (this.scrollY >= this.navTop) {
           this.isShow = true;
-
-          // this.isA = false;
         } else {
           this.isShow = false;
-
-          // this.isA = true;
         }
       }
     },