diff --git a/lib/json-viewer.vue b/lib/json-viewer.vue
index bdc5688..43ca244 100644
--- a/lib/json-viewer.vue
+++ b/lib/json-viewer.vue
@@ -266,6 +266,10 @@ export default {
     margin-right: 2px;
     display: inline-block;
     transition: transform 0.1s;
+
+    &.open {
+      transform: rotate(90deg)
+    }
   }
 
   .jv-more {
diff --git a/package.json b/package.json
index 857b658..ee4ed7d 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "vue-json-viewer",
-  "version": "2.2.9",
+  "version": "2.2.10",
   "description": "vuejs展示json的组件",
   "main": "vue-json-viewer.js",
   "files": [