fix(directory): unable to add the first level directory

src/components/tree/DirectoryTree/index.vue

@@ -218,12 +218,8 @@ export default {
         document.removeEventListener('click', this.closeContentMenu)
       }
     },
-    onAddRoot () {
-      this.node = { parentId: '0', name: '', org: this.group.path }
-      this.$refs.nodeDialog.show()
-    },
     onAddChildNode () {
-      this.node = { parentId: this.selectedNode.id, name: '', org: this.group.path }
+      this.node = { parentId: this.selectedNode.root ? '0' : this.selectedNode.id, name: '', org: this.group.path }
       this.$refs.nodeDialog.show()
       this.closeContentMenu()
     },
@@ -248,11 +244,7 @@ export default {
       } else {
         addTreeNode(this.node).then(({ data }) => {
           done()
-          if (this.node.parentId === '0') {
-            this.$refs.treeRef.append({ id: data, childrenNode: [], ...this.node })
-          } else {
-            this.$refs.treeRef.append({ id: data, childrenNode: [], ...this.node }, this.selectedNode)
-          }
+          this.$refs.treeRef.append({ id: data, childrenNode: [], ...this.node }, this.selectedNode)
           if (!this.$selectedVNode.expanded) {
             this.$selectedComponent.handleExpandIconClick()
           }