perf: 修改设备树组件loading延迟1s显示

packages/extend-components/EC_DeviceTree/src/index.js

@@ -127,7 +127,7 @@ const DeviceTree = (props) => {
       />
       <Divider className={classNames(`${prefixCls}-divider`)} />
       <div className={classNames(`${prefixCls}-content`)}>
-        <Spin spinning={loading}>
+        <Spin delay={1000} spinning={loading}>
           {!!treeData.length && (
             <Tree
               checkedKeys={checkedKeys}