[AI Generated]: feat(*): 新增 autoConnect 自动重连机制、OTA 断连兜底触发，修复 diff 为零时颜色与箭头展示异常

miniprogram/pages/equipment/equipment.ts

@@ -93,49 +93,19 @@ Page({
             })
     },
 
-    /** 检查缓存设备：已连接则直接标记，未连接则扫描匹配 deviceId 后自动连接 */
+    /** 检查缓存设备：已连接则直接标记，未连接则调 autoConnect 扫描重连 */
     _checkAndAutoConnect() {
-        const cachedRaw = wx.getStorageSync('connectDeviceInfo') as RawDevice | null
-        const targetDeviceId = cachedRaw?.deviceId as string | undefined
-        if (!targetDeviceId) return
-
         // 已连接且 deviceInfo 就绪，直接标记列表
         if (lefuService.isConnected && lefuService.deviceInfo?.serialNumber) {
             this._markConnected(lefuService.deviceInfo.serialNumber as string)
             return
         }
 
-        let scanTimer: number | null = null
-
-        wx.showLoading({ title: '连接中...', mask: true })
-        wx.openBluetoothAdapter({
-            success: () => {
-                scanTimer = setTimeout(() => {
-                    lefuService.stopScan()
-                    wx.hideLoading()
-                }, 15000)
-
-                lefuService.onDevicesList((devices) => {
-                    const matched = devices.find(d => d.raw.deviceId === targetDeviceId)
-                    if (!matched) return
-                    if (scanTimer !== null) { clearTimeout(scanTimer); scanTimer = null }
-                    lefuService.stopScan()
-                    lefuService.connect(matched.raw)
-                    lefuService.onDeviceConnect(() => {
-                        wx.hideLoading()
-                        wx.setStorageSync('connectDeviceInfo', matched.raw)
-                    })
-                    lefuService.onDeviceInfo((info) => {
-                        this._markConnected(info.serialNumber as string)
-                    })
-                })
-                lefuService.startScan()
-            },
-            fail: () => {
-                if (scanTimer !== null) { clearTimeout(scanTimer); scanTimer = null }
-                wx.hideLoading()
-            },
+        // 注册回调：连接成功后更新列表状态
+        lefuService.onDeviceInfo((info) => {
+            this._markConnected(info.serialNumber as string)
         })
+        lefuService.autoConnect()
     },
 
     /** 将 serialNumber 对应的列表项标记为已连接，其余置为未连接 */

miniprogram/pages/home/home.less

@@ -254,6 +254,10 @@
 						.diff-up {
 							color: #FF4D4F;
 						}
+
+						.diff-neutral {
+							color: #000000;
+						}
 					}
 
 					.diff-label {

miniprogram/pages/home/home.ts

@@ -83,10 +83,19 @@ Page({
 
     onShow() {
         // 每次进入 tab 同步最新设备状态
+        const connected = lefuService.isConnected
         this.setData({
-            'device.connected': lefuService.isConnected,
+            'device.connected': connected,
             'device.name': lefuService.deviceInfo?.modelNumber ?? '智能体重秤',
         })
+        // 进来时设备已连接（如热启动/切 tab 回来），onDeviceConnect 不会再触发，需在此补一次检测
+        if (connected && !this._otaChecked) {
+            this._checkOta()
+        }
+        // 断连时自动扫描重连，重连成功后 onDeviceConnect 回调会触发 OTA 检测
+        if (!connected) {
+            lefuService.autoConnect()
+        }
         this.loadData()
     },
 

miniprogram/pages/home/home.wxml

@@ -48,13 +48,13 @@
                         </view>
                         <view class="weight-diff">
                             <view class="diff-num-wrap">
-                                <view class="diff-num {{ record.diff < 0 ? 'diff-down' : 'diff-up' }}">{{ record.diff < 0 ? -record.diff : record.diff }}</view>
+                                <view class="diff-num {{ record.diff < 0 ? 'diff-down' : (record.diff > 0 ? 'diff-up' : 'diff-neutral') }}">{{ record.diff < 0 ? -record.diff : record.diff }}</view>
                                 <view class="diff-unit">
                                     kg
-                                    <text class="diff-arrow {{ record.diff < 0 ? 'arrow-down' : 'arrow-up' }}"></text>
+                                    <text wx:if="{{ record.diff !== 0 }}" class="diff-arrow {{ record.diff < 0 ? 'arrow-down' : 'arrow-up' }}"></text>
                                 </view>
                             </view>
-                            <view class="diff-label">{{ record.diff < 0 ? '体重较上次减轻' : '体重较上次增加' }}</view>
+                            <view class="diff-label">{{ record.diff < 0 ? '体重较上次减轻' : (record.diff > 0 ? '体重较上次增加' : '与上次持平') }}</view>
                         </view>
                     </view>
 

miniprogram/pages/measurementReport/measurementReport.less

@@ -202,6 +202,10 @@
 						.diff-up {
 							color: #FF4D4F;
 						}
+
+						.diff-neutral {
+							color: #000000;
+						}
 					}
 
 					.diff-label {

miniprogram/pages/measurementReport/measurementReport.wxml

@@ -32,13 +32,13 @@
 					</view>
 					<view class="weight-diff">
 						<view class="diff-num-wrap">
-							<view class="diff-num {{ record.diff < 0 ? 'diff-down' : 'diff-up' }}">{{ record.diff < 0 ? -record.diff : record.diff }}</view>
+							<view class="diff-num {{ record.diff < 0 ? 'diff-down' : (record.diff > 0 ? 'diff-up' : 'diff-neutral') }}">{{ record.diff < 0 ? -record.diff : record.diff }}</view>
 							<view class="diff-unit">
 								kg
-								<text class="diff-arrow {{ record.diff < 0 ? 'arrow-down' : 'arrow-up' }}"></text>
+								<text wx:if="{{ record.diff !== 0 }}" class="diff-arrow {{ record.diff < 0 ? 'arrow-down' : 'arrow-up' }}"></text>
 							</view>
 						</view>
-						<view class="diff-label">{{ record.diff < 0 ? '体重较上次减轻' : '体重较上次增加' }}</view>
+						<view class="diff-label">{{ record.diff < 0 ? '体重较上次减轻' : (record.diff > 0 ? '体重较上次增加' : '与上次持平') }}</view>
 					</view>
 				</view>