diff --git a/xuan-deduct-uniapp/src/components/auth-modal/auth-modal.vue b/xuan-deduct-uniapp/src/components/auth-modal/auth-modal.vue
index 040b2d9..21d8afa 100644
--- a/xuan-deduct-uniapp/src/components/auth-modal/auth-modal.vue
+++ b/xuan-deduct-uniapp/src/components/auth-modal/auth-modal.vue
@@ -5,14 +5,14 @@
         <view class="modal-icon">
           <text class="icon-text">🔐</text>
         </view>
-        <text class="modal-title">授权登录</text>
+        <text class="modal-title">微信授权登录</text>
         <text class="modal-subtitle">获取微信头像和昵称</text>
       </view>
       
       <view class="modal-content">
-        <button class="wechat-auth-btn" open-type="chooseAvatar" @chooseavatar="onChooseAvatar">
+        <button class="wechat-auth-btn" open-type="chooseAvatar" @chooseavatar="onChooseAvatar" @error="onChooseAvatarError">
           <view class="btn-icon">
-            <image class="wechat-icon" src="/static/wechat-icon.png" mode="aspectFit" />
+            <text class="wechat-icon-text">👤</text>
           </view>
           <text class="btn-text">微信授权登录</text>
         </button>
@@ -73,6 +73,19 @@ export default {
       }
     },
     
+    onChooseAvatarError(e) {
+      console.log('选择头像错误:', e)
+      const { errMsg } = e.detail
+      if (errMsg && errMsg.includes('cancel')) {
+        console.log('用户取消了选择头像')
+      } else {
+        uni.showToast({
+          title: '选择头像失败，请重试',
+          icon: 'none'
+        })
+      }
+    },
+    
     showNicknameInput() {
       uni.showModal({
         title: '设置昵称',
@@ -137,6 +150,7 @@ export default {
           uni.setStorageSync('vipLevel', res.data.vipLevel || 0)
           uni.setStorageSync('username', res.data.username || res.data.nickname)
           uni.setStorageSync('userAvatar', res.data.avatarUrl)
+          uni.setStorageSync('isLoggedIn', true)
           
           uni.showToast({ 
             title: '授权成功', 
@@ -190,7 +204,7 @@ export default {
   background: rgba(0, 0, 0, 0.5);
   z-index: 9999;
   display: flex;
-  align-items: center;
+  align-items: flex-end;
   justify-content: center;
   animation: fadeIn 0.3s ease;
 }
@@ -205,12 +219,12 @@ export default {
 }
 
 .auth-modal {
-  width: 600rpx;
+  width: 100%;
   background: #ffffff;
-  border-radius: 32rpx;
+  border-radius: 32rpx 32rpx 0 0;
   overflow: hidden;
-  box-shadow: 0 20rpx 60rpx rgba(0, 0, 0, 0.3);
-  transform: translateY(-100vh);
+  box-shadow: 0 -10rpx 40rpx rgba(0, 0, 0, 0.2);
+  transform: translateY(100%);
   transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
 }
 
@@ -277,11 +291,13 @@ export default {
   width: 48rpx;
   height: 48rpx;
   margin-right: 16rpx;
+  display: flex;
+  align-items: center;
+  justify-content: center;
 }
 
-.wechat-icon {
-  width: 48rpx;
-  height: 48rpx;
+.wechat-icon-text {
+  font-size: 36rpx;
 }
 
 .btn-text {
diff --git a/xuan-deduct-uniapp/src/utils/authCheck.js b/xuan-deduct-uniapp/src/utils/authCheck.js
new file mode 100644
index 0000000..e153fa3
--- /dev/null
+++ b/xuan-deduct-uniapp/src/utils/authCheck.js
@@ -0,0 +1,94 @@
+const authCheck = {
+  isLoggedIn() {
+    const isLoggedIn = uni.getStorageSync('isLoggedIn')
+    const userInfo = uni.getStorageSync('userInfo')
+    return !!(isLoggedIn && userInfo)
+  },
+  
+  requireLogin(callback) {
+    if (this.isLoggedIn()) {
+      if (callback && typeof callback === 'function') {
+        callback()
+      }
+      return true
+    } else {
+      uni.showModal({
+        title: '未登录',
+        content: '该功能需要登录后才能使用，是否前往登录？',
+        confirmText: '去登录',
+        cancelText: '取消',
+        success: (res) => {
+          if (res.confirm) {
+            uni.$emit('showAuthModal')
+          }
+        }
+      })
+      return false
+    }
+  },
+  
+  requireLoginAsync() {
+    return new Promise((resolve, reject) => {
+      if (this.isLoggedIn()) {
+        resolve(true)
+      } else {
+        uni.showModal({
+          title: '未登录',
+          content: '该功能需要登录后才能使用，是否前往登录？',
+          confirmText: '去登录',
+          cancelText: '取消',
+          success: (res) => {
+            if (res.confirm) {
+              uni.$emit('showAuthModal')
+              reject(new Error('需要登录'))
+            } else {
+              reject(new Error('用户取消登录'))
+            }
+          }
+        })
+      }
+    })
+  },
+  
+  getUserInfo() {
+    if (!this.isLoggedIn()) {
+      return null
+    }
+    
+    try {
+      const userInfoStr = uni.getStorageSync('userInfo')
+      return userInfoStr ? JSON.parse(userInfoStr) : null
+    } catch (e) {
+      console.error('解析用户信息失败:', e)
+      return null
+    }
+  },
+  
+  getUserId() {
+    const userInfo = this.getUserInfo()
+    return userInfo ? userInfo.userId : null
+  },
+  
+  logout() {
+    uni.removeStorageSync('isLoggedIn')
+    uni.removeStorageSync('userInfo')
+    uni.removeStorageSync('userId')
+    uni.removeStorageSync('userCoins')
+    uni.removeStorageSync('vipLevel')
+    uni.removeStorageSync('username')
+    uni.removeStorageSync('userAvatar')
+    
+    uni.showToast({
+      title: '已退出登录',
+      icon: 'success'
+    })
+    
+    setTimeout(() => {
+      uni.switchTab({
+        url: '/pages/index/index'
+      })
+    }, 1500)
+  }
+}
+
+export default authCheck