上线：用户管理页面中加入部门树，根据部门过滤用户，前后端接口数据完成调试

frontend/src/views/system/dept/index.vue

@@ -57,15 +57,16 @@
           </a-space>
         </template>
 
-        <a-table 
+        <a-table v-if="dataSource.length"
+          :defaultExpandAllRows="true" 
           :rowKey="record => record.id"
           :columns="columns"
           :data-source="dataSource"
           :loading="tableLoading"
-          :scroll="{ x: 500, y: 'calc(100vh - 500px)' }"
+          :scroll="{ x: 500, y: 'calc(100vh - 300px)' }"
           :row-selection="rowSelection"
           :pagination="false"
-          :style="{ minHeight: '500px' }"
+          :style="{ minHeight: '300px' }"
         >
           <template #bodyCell="{ column, record }">