remove useless index param of onSwitch

src/components/interactions/interactions.js

@@ -13,7 +13,7 @@ const Interactions = {
     }
   },
   methods: {
-    onModeSwitch (index, dataset) {
+    onModeSwitch (dataset) {
       this.filterMode = tabModeDict[dataset.filter]
     }
   },

src/components/search/search.js

@@ -75,7 +75,7 @@ const Search = {
       const length = this[tabName].length
       return length === 0 ? '' : ` (${length})`
     },
-    onResultTabSwitch (_index, dataset) {
+    onResultTabSwitch (dataset) {
       this.currenResultTab = dataset.filter
     },
     getActiveTab () {

src/components/tab_switcher/tab_switcher.js

@@ -20,7 +20,7 @@ export default Vue.component('tab-switcher', {
     activateTab (index, dataset) {
       return () => {
         if (typeof this.onSwitch === 'function') {
-          this.onSwitch.call(null, index, this.$slots.default[index].elm.dataset)
+          this.onSwitch.call(null, this.$slots.default[index].elm.dataset)
         }
         this.active = index
       }