feat(TreeSelect): add dot option (#4433)

src/tree-select/demo/index.vue

@@ -24,16 +24,22 @@
         </template>
       </van-tree-select>
     </demo-block>
+
+    <demo-block :title="$t('showInfo')">
+      <van-tree-select height="55vw" :items="infoItems" :active-id.sync="activeId2" :main-active-index.sync="activeIndex4" />
+    </demo-block>
   </demo-section>
 </template>
 
 <script>
 import { zhCNData } from './data.zh-CN';
 import { enUSData } from './data.en-US';
+import { deepClone } from '../../utils/deep-clone';
 
 export default {
   i18n: {
     'zh-CN': {
+      showInfo: '提示信息',
       radioMode: '单选模式',
       multipleMode: '多选模式',
       customContent: '自定义内容',
@@ -41,6 +47,7 @@ export default {
       dataSimple: [{ text: '分组 1' }, { text: '分组 2' }]
     },
     'en-US': {
+      showInfo: 'Show Info',
       radioMode: 'Radio Mode',
       multipleMode: 'Multiple Mode',
       customContent: 'Custom Content',
@@ -56,7 +63,8 @@ export default {
       activeIds: [1, 2],
       activeIndex: 0,
       activeIndex2: 0,
-      activeIndex3: 0
+      activeIndex3: 0,
+      activeIndex4: 0
     };
   },
 
@@ -67,6 +75,15 @@ export default {
 
     simpleItems() {
       return this.$t('dataSimple');
+    },
+
+    infoItems() {
+      const data = deepClone(this.$t('data')).slice(0, 2);
+
+      data[0].dot = true;
+      data[1].info = 5;
+
+      return data;
     }
   }
 };