feat: 添加默认头像常量

@@ -122,11 +122,13 @@
 
 <script setup>
 import { ref, computed, onMounted, markRaw } from 'vue'
-
 import { Search2, Notice, Message } from '@nutui/icons-vue-taro'
 import TabBar from '@/components/TabBar.vue'
 import { $ } from '@tarojs/extend'
 
+// 默认头像
+const defaultAvatar = 'https://cdn.ipadbiz.cn/mlaj/images/icon_1.jpeg'
+
 const scrollStyle = ref({
     height: 'calc(100vh - 500rpx)'
 })