fix

@@ -511,8 +511,8 @@
     direction="btt"
     size="90%"
     append-to-body
+    @closed="handleDrawerClosed"
   >
-    <!-- <div class="preview-container" :style="{height: state.window_height}"> -->
     <div class="preview-container">
       <vue-flow-editor-form
         ref="editor1"
@@ -531,9 +531,6 @@
     <div class="preview-detail-container">
       <iframe :src="state.preview_form_url" width="100%" height="100%" style="border: 0;"></iframe>
     </div>
-    <!-- <div>
-      <el-button color="#009688" @click="state.dialogPreviewVisible = false">关闭</el-button>
-    </div> -->
   </el-drawer>
 </template>
 
@@ -2333,6 +2330,10 @@ export default {
       state.preview_form_url = null;
     }
 
+    const handleDrawerClosed = () => {
+      state.preview_form_url = null;
+    }
+
     return {
       state,
       rules,
@@ -2393,6 +2394,7 @@ export default {
       openPreview,
       onClickNodePreview,
       onClickCanvasPreview,
+      handleDrawerClosed,
 
       onRef: (e: any) => (editor = e),
       staticPath,