diff --git a/frontend/src/views/editor/basic/cursorPositionExtension.ts b/frontend/src/views/editor/basic/cursorPositionExtension.ts
index 9592253..4423e3b 100644
--- a/frontend/src/views/editor/basic/cursorPositionExtension.ts
+++ b/frontend/src/views/editor/basic/cursorPositionExtension.ts
@@ -7,48 +7,49 @@ import {createDebounce} from '@/common/utils/debounce';
  * 实时监听光标位置变化并持久化到 documentStore
  */
 export function createCursorPositionExtension(documentId: number) {
-  return ViewPlugin.fromClass(
-    class CursorPositionPlugin {
-      private readonly documentStore = useDocumentStore();
-      private readonly debouncedSave;
+    return ViewPlugin.fromClass(
+        class CursorPositionPlugin {
+            private readonly documentStore = useDocumentStore();
+            private readonly debouncedSave;
 
-      constructor(private view: EditorView) {
-        const { debouncedFn, flush } = createDebounce(
-          () => this.saveCursorPosition(),
-          { delay: 400 }
-        );
-        this.debouncedSave = { fn: debouncedFn, flush };
+            constructor(private view: EditorView) {
+                const {debouncedFn, flush} = createDebounce(
+                    () => this.saveCursorPosition(),
+                    {delay: 400}
+                );
+                this.debouncedSave = {fn: debouncedFn, flush};
 
-        // 初始化时保存一次光标位置
-        this.saveCursorPosition();
-      }
+                // 初始化时保存一次光标位置
+                this.saveCursorPosition();
+            }
 
-      update(update: ViewUpdate) {
-        // 只在选择变化时触发
-        if (!update.selectionSet) {
-          return;
+            update(update: ViewUpdate) {
+                // 只在选择变化时触发
+                if (!update.selectionSet) {
+                    return;
+                }
+
+                // 防抖保存光标位置
+                this.debouncedSave.fn();
+            }
+
+            destroy() {
+                // 销毁时立即执行待保存的操作
+                this.debouncedSave.flush();
+                // 再保存一次确保最新状态
+                this.saveCursorPosition();
+            }
+
+            private saveCursorPosition() {
+                const cursorPos = this.view.state.selection.main.head;
+                if (!this.documentStore.documentStates[documentId]) {
+                    this.documentStore.documentStates[documentId] = {cursorPos};
+                } else {
+                    this.documentStore.documentStates[documentId].cursorPos = cursorPos;
+                }
+            }
         }
-
-        // 防抖保存光标位置
-        this.debouncedSave.fn();
-      }
-
-      destroy() {
-        // 销毁时立即执行待保存的操作
-        this.debouncedSave.flush();
-        // 再保存一次确保最新状态
-        this.saveCursorPosition();
-      }
-
-      private saveCursorPosition() {
-        const cursorPos = this.view.state.selection.main.head;
-        // 持久化到 documentStore
-        this.documentStore.documentStates[documentId] = {
-            cursorPos
-        };
-      }
-    }
-  );
+    );
 }
 
 /**
@@ -56,12 +57,12 @@ export function createCursorPositionExtension(documentId: number) {
  * @param view 编辑器视图
  */
 export function scrollToCursor(view: EditorView) {
-  const cursorPos = view.state.selection.main.head;
-  view.dispatch({
-    effects: EditorView.scrollIntoView(cursorPos, {
-      y: 'center',
-      x: 'center'
-    })
-  });
+    const cursorPos = view.state.selection.main.head;
+    view.dispatch({
+        effects: EditorView.scrollIntoView(cursorPos, {
+            y: 'center',
+            x: 'center'
+        })
+    });
 }