新增小程序后端代码，包括数据库、路由、服务层等。

小程序前后端打通，包括登录、注册、绑定设备、查询绑定信息，修改小朋友名称等功能。

banban-mini/src/pages/bind/index.tsx

@@ -1,27 +1,59 @@
-import { View, Text, Button, Image } from '@tarojs/components'
+import { View, Text, Button, Image, Input } from '@tarojs/components'
 import { useState, useEffect } from 'react'
 import Taro from '@tarojs/taro'
+import { getToken } from '@/services/api'
+import { getCurrentBinding, directBind } from '@/services/binding'
+import { getChildren, createChild } from '@/services/child'
 import './index.scss'
 
+interface Child {
+  child_id: number
+  child_name: string
+}
+
 export default function Bind() {
   const [isScanning, setIsScanning] = useState(false)
+  const [loading, setLoading] = useState(true)
+  const [children, setChildren] = useState<Child[]>([])
+  const [newChildName, setNewChildName] = useState('')
+  const [saving, setSaving] = useState(false)
 
   useEffect(() => {
-    // 检查是否已登录
-    const isLoggedIn = Taro.getStorageSync('isLoggedIn')
-    if (!isLoggedIn) {
-      // 未登录，跳转到登录页面
+    checkAuth()
+  }, [])
+
+  const checkAuth = async () => {
+    const token = getToken()
+    if (!token) {
       Taro.redirectTo({ url: '/pages/login/index' })
       return
     }
 
-    // 检查是否已绑定设备
-    const hasDevice = Taro.getStorageSync('hasDevice')
-    if (hasDevice) {
-      // 已绑定设备，跳转到首页
-      Taro.reLaunch({ url: '/pages/device/index' })
+    try {
+      const childRes = await getChildren()
+      setChildren(childRes.items || [])
+      
+      if (childRes.items?.length === 0) {
+        setLoading(false)
+        return
+      }
+    } catch (err) {
+      console.error('Get children failed:', err)
     }
-  }, [])
+
+    try {
+      const binding = await getCurrentBinding()
+      if (binding) {
+        Taro.showToast({ title: '已有设备绑定', icon: 'none' })
+        setTimeout(() => {
+          Taro.reLaunch({ url: '/pages/device/index' })
+        }, 1000)
+        return
+      }
+    } catch (err) {
+    }
+    setLoading(false)
+  }
 
   const handleScanCode = () => {
     setIsScanning(true)
@@ -29,56 +61,57 @@ export default function Bind() {
     Taro.scanCode({
       onlyFromCamera: true,
       scanType: ['qrCode', 'barCode'],
-      success: (res) => {
+      success: async (res) => {
         setIsScanning(false)
-        console.log('扫码结果：', res.result)
+        const deviceId = res.result
         
-        // 模拟绑定设备
-        Taro.showLoading({ title: '绑定中...' })
-        
-        setTimeout(() => {
-          Taro.hideLoading()
-          
-          // 保存设备信息
-          Taro.setStorageSync('hasDevice', true)
-          Taro.setStorageSync('deviceInfo', {
-            id: res.result || 'DEVICE_' + Date.now(),
-            name: '小夏的伴伴',
-            status: 'online',
-            battery: 82,
-            bindTime: new Date().toLocaleString()
-          })
-          
-          Taro.showToast({
-            title: '设备绑定成功',
-            icon: 'success',
-            duration: 2000,
-            complete: () => {
-              // 绑定成功，跳转到首页
-              setTimeout(() => {
-                Taro.reLaunch({ url: '/pages/device/index' })
-              }, 500)
-            }
-          })
-        }, 1500)
+        if (!deviceId) {
+          Taro.showToast({ title: '无效的设备码', icon: 'none' })
+          return
+        }
+
+        await doBind(deviceId)
       },
       fail: (err) => {
         setIsScanning(false)
-        console.error('扫码失败：', err)
-        
-        // 用户取消扫码，不显示错误
         if (err.errMsg && err.errMsg.includes('cancel')) {
           return
         }
-        
-        Taro.showToast({
-          title: '扫码失败，请重试',
-          icon: 'none'
-        })
+        Taro.showToast({ title: '扫码失败', icon: 'none' })
       }
     })
   }
 
+  const doBind = async (deviceId: string) => {
+    if (children.length === 0) {
+      Taro.showToast({ title: '请先添加儿童', icon: 'none' })
+      return
+    }
+
+    Taro.showLoading({ title: '绑定中...' })
+    
+    try {
+      await directBind({
+        device_id: deviceId,
+        child_id: children[0].child_id
+      })
+      Taro.hideLoading()
+      Taro.showToast({
+        title: '设备绑定成功',
+        icon: 'success',
+        duration: 1500,
+        complete: () => {
+          setTimeout(() => {
+            Taro.reLaunch({ url: '/pages/device/index' })
+          }, 500)
+        }
+      })
+    } catch (err: any) {
+      Taro.hideLoading()
+      Taro.showToast({ title: err.message || '绑定失败', icon: 'none' })
+    }
+  }
+
   const handleManualInput = () => {
     Taro.showModal({
       title: '手动输入设备码',
@@ -86,37 +119,60 @@ export default function Bind() {
       placeholderText: '请输入设备底部的设备码',
       success: (res) => {
         if (res.confirm && res.content) {
-          // 模拟绑定设备
-          Taro.showLoading({ title: '绑定中...' })
-          
-          setTimeout(() => {
-            Taro.hideLoading()
-            
-            Taro.setStorageSync('hasDevice', true)
-            Taro.setStorageSync('deviceInfo', {
-              id: res.content,
-              name: '小夏的伴伴',
-              status: 'online',
-              battery: 82,
-              bindTime: new Date().toLocaleString()
-            })
-            
-            Taro.showToast({
-              title: '设备绑定成功',
-              icon: 'success',
-              duration: 2000,
-              complete: () => {
-                setTimeout(() => {
-                  Taro.reLaunch({ url: '/pages/device/index' })
-                }, 500)
-              }
-            })
-          }, 1500)
+          doBind(res.content)
         }
       }
     })
   }
 
+  const handleAddChild = async () => {
+    if (!newChildName.trim()) {
+      Taro.showToast({ title: '请输入儿童姓名', icon: 'none' })
+      return
+    }
+    setSaving(true)
+    try {
+      await createChild({ child_name: newChildName.trim() })
+      Taro.showToast({ title: '添加成功', icon: 'success' })
+      const childRes = await getChildren()
+      setChildren(childRes.items || [])
+    } catch (err) {
+      Taro.showToast({ title: '添加失败', icon: 'none' })
+    } finally {
+      setSaving(false)
+    }
+  }
+
+  if (loading) {
+    return (
+      <View className='bind-page'>
+        <View className='loading'>加载中...</View>
+      </View>
+    )
+  }
+
+  if (children.length === 0) {
+    return (
+      <View className='bind-page'>
+        <View className='empty-tip'>
+          <Text className='empty-title'>请先添加儿童</Text>
+          <Text className='empty-desc'>绑定设备前需要先添加儿童信息</Text>
+          <View className='empty-input-wrap'>
+            <Input 
+              className='empty-input'
+              placeholder='请输入儿童姓名'
+              value={newChildName}
+              onInput={(e) => setNewChildName(e.detail.value)}
+            />
+          </View>
+          <View className='empty-btn' onClick={handleAddChild}>
+            <Text className='empty-btn-text'>{saving ? '保存中...' : '确认添加'}</Text>
+          </View>
+        </View>
+      </View>
+    )
+  }
+
   return (
     <View className='bind-page'>
       <View className='bind-header'>
@@ -170,4 +226,4 @@ export default function Bind() {
       </View>
     </View>
   )
-}
+}