feat(ChatList): add scrollToBottom method demo

Author: zydemail

packages/pro-components/chat/chat-list/_example/base/index.js

@@ -67,6 +67,13 @@ Component({
   },
 
   methods: {
+    // 调用chatList的滚动到底部方法
+    scrollToBottom() {
+      const chatListComponent = this.selectComponent('#chatList');
+      if (chatListComponent && typeof chatListComponent.scrollToBottom === 'function') {
+        chatListComponent.scrollToBottom();
+      }
+    },
     onScroll(e) {
       console.log('监听滚动', e);
     },

packages/pro-components/chat/chat-list/_example/base/index.wxml

@@ -1,5 +1,5 @@
 <view class="chat-box" style="height: {{contentHeight}};">
-  <t-chat bindscroll="onScroll">
+  <t-chat id="chatList" bindscroll="onScroll">
     <block wx:for="{{chatList}}" wx:key="index">
       <t-chat-message
         avatar="{{item.avatar || ''}}"