feat(contact): 增强客服页面功能

- 添加下拉刷新功能并设置背景色
- 调整滚动加载阈值从20改为100
- 修改getMessages返回Promise以支持链式调用
- 在页面显示时立即获取最新消息
- 实现下拉刷新时获取最新消息并停止动画

pages/contact/index.js

@@ -56,7 +56,7 @@ Page({
   getMessages() {
     const userInfo = wx.getStorageSync('user_info');
     const that = this;
-    request('app/messages', 'get', {
+    return request('app/messages', 'get', {
       app_id: that.data.appid,
       user_id: userInfo.openid,
       page: that.data.page,
@@ -74,7 +74,9 @@ Page({
         // only auto-scroll if user is at bottom
         scrollToId: that.data.isAtBottom ? (sortedList[sortedList.length - 1] ? sortedList[sortedList.length - 1].id : '') : that.data.scrollToId
       });
-    })
+      
+      return res; // 返回结果以支持链式调用
+    });
   },
 
   // Load older messages (previous pages) and prepend them to the top
@@ -476,8 +478,11 @@ Page({
   },
 
   onShow() {
-    // resume polling when page becomes visible
+    // resume polling when page becomes visible and get latest messages
     if (wx.getStorageSync('user_info')) {
+      // 立即请求最新消息
+      this.getMessages();
+      // 然后开始轮询
       this.startPolling();
     }
   },
@@ -489,7 +494,19 @@ Page({
     // cleanup
     this.stopPolling();
   },
-  onPullDownRefresh() { },
+  onPullDownRefresh() {
+    // 下拉刷新时获取最新消息
+    if (wx.getStorageSync('user_info')) {
+      this.getMessages().then(() => {
+        // 停止下拉刷新动画
+        wx.stopPullDownRefresh();
+      }).catch(() => {
+        wx.stopPullDownRefresh();
+      });
+    } else {
+      wx.stopPullDownRefresh();
+    }
+  },
   onReachBottom() { },
   onShareAppMessage() { }
 });

pages/contact/index.json

@@ -1,5 +1,6 @@
 {
   "usingComponents": {},
-  "navigationBarTitleText": "联系客服"
-
+  "navigationBarTitleText": "联系客服",
+  "enablePullDownRefresh": true,
+  "backgroundColor": "#fafbfc"
 }

pages/contact/index.wxml

@@ -6,7 +6,7 @@
 		<text class="header-title">租号客服</text>
 	</view> -->
 
-	<scroll-view class="messages" scroll-y="true" scroll-into-view="{{scrollToId}}" bindscroll="onScroll" bindscrolltolower="onScrollToLower" lower-threshold="20">
+	<scroll-view class="messages" scroll-y="true" scroll-into-view="{{scrollToId}}" bindscroll="onScroll" bindscrolltolower="onScrollToLower" lower-threshold="100">
 		<block wx:for="{{messages}}" wx:key="id">
 			<!-- 时间分割线 -->
 			<block wx:if="{{item.showTime}}">