diff --git a/src/collapse/index.js b/src/collapse/index.js
index 62cff09..1fd9b6a 100644
--- a/src/collapse/index.js
+++ b/src/collapse/index.js
@@ -69,7 +69,7 @@ class CollapseItem extends Component {
     title: '',
     disabled: false
   }
-  _show = false
+  #show = false
   contentHeight = 0
   static styles = [
     css`
@@ -122,17 +122,17 @@ class CollapseItem extends Component {
     this.$emit('updateValue', { name: this.name })
   }
   get show() {
-    return this._show
+    return this.#show
   }
   set show(val) {
-    this._show = val
+    this.#show = val
     this.contentHeight = this.$refs.content?.offsetHeight || 0
     this.$requestUpdate()
   }
   mounted() {
     nextTick(() => {
       this.contentHeight = this.$refs.content.offsetHeight
-      this.$requestUpdate()
+      this.show && this.$requestUpdate()
     })
   }
   render() {