修改树一直加载loding一直存在的问题

src/components/inputModules/common/TreeView.vue

@@ -171,13 +171,14 @@ export default {
         book_id: this.bookId,
       };
       getContent(MethodName, data).then((res) => {
+        this.loading = false;
+
         _this.handleData(res, 0);
         _this.treeData = res.nodes;
         _this.changeTreeData(this.treeData);
         _this.$nextTick(() => {
           _this.foldAll();
         });
-        this.loading = false;
       });
     },
     // 递归