Update index.vue

packages/components/STab/index.vue

@@ -75,7 +75,9 @@ export default {
   },
   mounted () {
     let vm = this
-    this.items[vm.current].$el.classList.add('activated')
+    setTimeout(()=>{
+      this.items[vm.current].$el.classList.add('activated')
+    },100)
     this.scrollToActiveTab(vm.current, this.items[vm.current].$el.clientWidth)
   },
   methods: {