feat：Tree组件 新增显示隐藏功能以及注释

@@ -31,7 +31,7 @@
   import { CreateContextOptions } from '/@/components/ContextMenu';
 
   import { CheckEvent } from './typing';
-  import { LeftOutlined, RightOutlined } from '@ant-design/icons-vue';
+  import { DoubleLeftOutlined, DoubleRightOutlined } from '@ant-design/icons-vue';
 
   interface State {
     expandedKeys: Keys;
@@ -449,28 +449,21 @@
 
             <Empty v-show={unref(getNotFound)} image={Empty.PRESENTED_IMAGE_SIMPLE} class="!mt-4" />
             <span
-              class={['is-flod']}
               v-show={unref(isFlod)}
               onClick={() => handleFlodOrUnFoldFunc(false)}
-              style={
-                isFlod.value
-                  ? 'z-index:9999;cursor:pointer;position:absolute;top:40vh;left:17.5vw'
-                  : 'z-index:9999;cursor:pointer;position:absolute;top:40vh;left:0.5vw'
-              }
+              class={['is-flod', unref(isFlod) ? 'fold-right' : 'fold-left']}
             >
-              <RightOutlined />
+              <DoubleLeftOutlined />
             </span>
             <span
-              class={['is-unflod']}
               v-show={!unref(isFlod) && unref(treeDataRef).length != 0}
               onClick={() => handleFlodOrUnFoldFunc(true)}
-              style={
-                isFlod.value
-                  ? 'z-index:9999;cursor:pointer;position:absolute;top:40vh;left:17.5vw'
-                  : 'z-index:9999;cursor:pointer;position:absolute;top:40vh;left:0.5vw'
-              }
+              class={[
+                'is-unflod',
+                !unref(isFlod) && unref(treeDataRef).length != 0 ? 'fold-left' : 'fold-right',
+              ]}
             >
-              <LeftOutlined />
+              <DoubleRightOutlined />
             </span>
           </div>
         );
@@ -479,6 +472,20 @@
   });
 </script>
 <style lang="less">
+  .fold-left {
+    z-index: 9999;
+    cursor: pointer;
+    position: absolute;
+    top: 0.85rem;
+    left: 0.5vw;
+  }
+  .fold-right {
+    z-index: 9999;
+    cursor: pointer;
+    position: absolute;
+    top: 0.85rem;
+    left: 17.5vw;
+  }
   @prefix-cls: ~'@{namespace}-basic-tree';
 
   .@{prefix-cls} {