[Improvement] Tab: click event add title param (#761)

docs/demos/views/tab.vue

@@ -33,7 +33,7 @@
     </demo-block>
 
     <demo-block :title="$t('title5')">
-      <van-tabs @click="handleTabClick">
+      <van-tabs @click="onClick">
         <van-tab v-for="index in 4" :title="$t('tab') + index" :key="index">
           {{ $t('content') }} {{ index }}
         </van-tab>
@@ -80,7 +80,8 @@ export default {
       title5: '点击事件',
       title6: '粘性布局',
       title7: '自定义标签',
-      title8: '滑动切换'
+      title8: '滑动切换',
+      disabled: ' 已被禁用'
     },
     'en-US': {
       tab: 'Tab ',
@@ -91,7 +92,8 @@ export default {
       title5: 'Click Event',
       title6: 'Sticky',
       title7: 'Custom Tab',
-      title8: 'Swipeable'
+      title8: 'Swipeable',
+      disabled: ' is disabled'
     }
   },
 
@@ -103,12 +105,12 @@ export default {
   },
 
   methods: {
-    onClickDisabled() {
-      Toast('Disabled!');
+    onClickDisabled(index, title) {
+      this.$toast(title + this.$t('disabled'));
     },
 
-    handleTabClick(index) {
-      Toast(index);
+    onClick(index, title) {
+      this.$toast(title);
     }
   }
 };