diff --git a/frontend/src/components/toolbar/index.vue b/frontend/src/components/toolbar/index.vue
index 7253fbc..1adc952 100644
--- a/frontend/src/components/toolbar/index.vue
+++ b/frontend/src/components/toolbar/index.vue
@@ -18,7 +18,7 @@ const editorStore = useEditorStore();
       </span>
     </div>
     <div class="actions">
-      <span class="font-size" title="字体大小 (Ctrl+滚轮调整)">
+      <span class="font-size" title="字体大小 (Ctrl+滚轮调整)" @click="editorStore.resetFontSize">
         {{ editorStore.fontSize }}px
       </span>
       <span class="tab-settings">
diff --git a/frontend/src/editor/extensions/basicSetup.ts b/frontend/src/editor/extensions/basicSetup.ts
new file mode 100644
index 0000000..0cd1c1e
--- /dev/null
+++ b/frontend/src/editor/extensions/basicSetup.ts
@@ -0,0 +1,79 @@
+import {Extension} from '@codemirror/state';
+import {
+  crosshairCursor,
+  drawSelection,
+  dropCursor,
+  EditorView,
+  highlightActiveLine,
+  highlightActiveLineGutter,
+  highlightSpecialChars,
+  keymap,
+  lineNumbers,
+  rectangularSelection,
+} from '@codemirror/view';
+import {
+  bracketMatching,
+  defaultHighlightStyle,
+  foldGutter,
+  foldKeymap,
+  indentOnInput,
+  syntaxHighlighting,
+} from '@codemirror/language';
+import {
+  defaultKeymap,
+  history,
+  historyKeymap,
+} from '@codemirror/commands';
+import {highlightSelectionMatches, searchKeymap} from '@codemirror/search';
+import {autocompletion, closeBrackets, closeBracketsKeymap, completionKeymap} from '@codemirror/autocomplete';
+import {lintKeymap} from '@codemirror/lint';
+import {baseDark, customHighlightActiveLine} from '@/editor/theme/base-dark';
+
+// 基本编辑器设置，包含常用扩展
+export const createBasicSetup = (): Extension[] => {
+  return [
+    // 主题相关
+    baseDark,
+    
+    // 基础UI
+    lineNumbers(),
+    highlightActiveLineGutter(),
+    highlightSpecialChars(),
+    dropCursor(),
+    EditorView.lineWrapping,
+    
+    // 历史记录
+    history(),
+    
+    // 代码折叠
+    foldGutter(),
+    
+    // 选择与高亮
+    drawSelection(),
+    customHighlightActiveLine,
+    highlightActiveLine(),
+    highlightSelectionMatches(),
+    rectangularSelection(),
+    crosshairCursor(),
+    
+    // 缩进和编辑辅助
+    indentOnInput(),
+    syntaxHighlighting(defaultHighlightStyle, {fallback: true}),
+    bracketMatching(),
+    closeBrackets(),
+    
+    // 自动完成
+    autocompletion(),
+    
+    // 键盘映射
+    keymap.of([
+      ...closeBracketsKeymap,
+      ...defaultKeymap,
+      ...searchKeymap,
+      ...historyKeymap,
+      ...foldKeymap,
+      ...completionKeymap,
+      ...lintKeymap
+    ]),
+  ];
+}; 
\ No newline at end of file
diff --git a/frontend/src/editor/extensions/index.ts b/frontend/src/editor/extensions/index.ts
new file mode 100644
index 0000000..233c8ce
--- /dev/null
+++ b/frontend/src/editor/extensions/index.ts
@@ -0,0 +1,4 @@
+// 统一导出所有扩展
+export * from './tabExtension';
+export * from './wheelZoomExtension';
+export * from './statsExtension'; 
\ No newline at end of file
diff --git a/frontend/src/editor/extensions/statsExtension.ts b/frontend/src/editor/extensions/statsExtension.ts
new file mode 100644
index 0000000..ed71a51
--- /dev/null
+++ b/frontend/src/editor/extensions/statsExtension.ts
@@ -0,0 +1,42 @@
+import {Extension} from '@codemirror/state';
+import {EditorView} from '@codemirror/view';
+import {DocumentStats} from '@/types/editor';
+
+// 更新编辑器文档统计信息
+export const updateStats = (
+  view: EditorView, 
+  updateDocumentStats: (stats: DocumentStats) => void
+) => {
+  if (!view) return;
+  
+  const state = view.state;
+  const doc = state.doc;
+  const text = doc.toString();
+  
+  // 计算选中的字符数
+  let selectedChars = 0;
+  const selections = state.selection;
+  if (selections) {
+    for (let i = 0; i < selections.ranges.length; i++) {
+      const range = selections.ranges[i];
+      selectedChars += range.to - range.from;
+    }
+  }
+  
+  updateDocumentStats({
+    lines: doc.lines,
+    characters: text.length,
+    selectedCharacters: selectedChars
+  });
+};
+
+// 创建统计信息更新监听器扩展
+export const createStatsUpdateExtension = (
+  updateDocumentStats: (stats: DocumentStats) => void
+): Extension => {
+  return EditorView.updateListener.of(update => {
+    if (update.docChanged || update.selectionSet) {
+      updateStats(update.view, updateDocumentStats);
+    }
+  });
+}; 
\ No newline at end of file
diff --git a/frontend/src/editor/extensions/tabExtension.ts b/frontend/src/editor/extensions/tabExtension.ts
new file mode 100644
index 0000000..abccd63
--- /dev/null
+++ b/frontend/src/editor/extensions/tabExtension.ts
@@ -0,0 +1,74 @@
+import {Compartment, Extension} from '@codemirror/state';
+import {EditorView, keymap} from '@codemirror/view';
+import {indentSelection} from '@codemirror/commands';
+import {indentUnit} from '@codemirror/language';
+
+// Tab设置相关的compartment
+export const tabSizeCompartment = new Compartment();
+export const tabKeyCompartment = new Compartment();
+
+// 自定义Tab键处理函数
+export const tabHandler = (view: EditorView, tabSize: number): boolean => {
+  // 如果有选中文本，使用indentSelection
+  if (!view.state.selection.main.empty) {
+    return indentSelection(view);
+  }
+  
+  // 创建相应数量的空格
+  const spaces = ' '.repeat(tabSize);
+  
+  // 在光标位置插入空格
+  const {state, dispatch} = view;
+  dispatch(state.update(state.replaceSelection(spaces), {scrollIntoView: true}));
+  return true;
+};
+
+// 获取Tab相关的扩展
+export const getTabExtensions = (tabSize: number, enableTabIndent: boolean): Extension[] => {
+  const extensions: Extension[] = [];
+  
+  // 设置缩进单位
+  extensions.push(tabSizeCompartment.of(indentUnit.of(' '.repeat(tabSize))));
+  
+  // 如果启用了Tab缩进，添加自定义Tab键映射
+  if (enableTabIndent) {
+    extensions.push(
+      tabKeyCompartment.of(
+        keymap.of([{
+          key: "Tab",
+          run: (view) => tabHandler(view, tabSize)
+        }])
+      )
+    );
+  } else {
+    extensions.push(tabKeyCompartment.of([]));
+  }
+  
+  return extensions;
+};
+
+// 更新Tab配置
+export const updateTabConfig = (
+  view: EditorView | null,
+  tabSize: number, 
+  enableTabIndent: boolean
+) => {
+  if (!view) return;
+  
+  // 更新indentUnit配置
+  view.dispatch({
+    effects: tabSizeCompartment.reconfigure(indentUnit.of(' '.repeat(tabSize)))
+  });
+  
+  // 更新Tab键映射
+  const tabKeymap = enableTabIndent
+    ? keymap.of([{
+        key: "Tab", 
+        run: (view) => tabHandler(view, tabSize)
+      }])
+    : [];
+  
+  view.dispatch({
+    effects: tabKeyCompartment.reconfigure(tabKeymap)
+  });
+}; 
\ No newline at end of file
diff --git a/frontend/src/editor/extensions/wheelZoomExtension.ts b/frontend/src/editor/extensions/wheelZoomExtension.ts
new file mode 100644
index 0000000..92b674c
--- /dev/null
+++ b/frontend/src/editor/extensions/wheelZoomExtension.ts
@@ -0,0 +1,35 @@
+import {EditorView} from '@codemirror/view';
+
+// 处理滚轮缩放字体的事件处理函数
+export const createWheelZoomHandler = (
+  increaseFontSize: () => void,
+  decreaseFontSize: () => void
+) => {
+  return (event: WheelEvent) => {
+    // 检查是否按住了Ctrl键
+    if (event.ctrlKey) {
+      // 阻止默认行为（防止页面缩放）
+      event.preventDefault();
+      
+      // 根据滚轮方向增大或减小字体
+      if (event.deltaY < 0) {
+        // 向上滚动，增大字体
+        increaseFontSize();
+      } else {
+        // 向下滚动，减小字体
+        decreaseFontSize();
+      }
+    }
+  };
+};
+
+// 应用字体大小到编辑器
+export const applyFontSize = (view: EditorView, fontSize: number) => {
+  if (!view) return;
+  
+  // 更新编辑器的字体大小
+  const editorDOM = view.dom;
+  if (editorDOM) {
+    editorDOM.style.fontSize = `${fontSize}px`;
+  }
+}; 
\ No newline at end of file
diff --git a/frontend/src/editor/font/font.ts b/frontend/src/editor/font/font.ts
deleted file mode 100644
index 312174b..0000000
--- a/frontend/src/editor/font/font.ts
+++ /dev/null
@@ -1,8 +0,0 @@
-import {EditorView} from '@codemirror/view'
-
-export const fontTheme = EditorView.theme({
-    '&': {
-        fontFamily: '"Microsoft YaHei", "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", Arial, sans-serif',
-        fontSize: '12px'
-    }
-})
\ No newline at end of file
diff --git a/frontend/src/editor/index.vue b/frontend/src/editor/index.vue
index 23530bc..8e33632 100644
--- a/frontend/src/editor/index.vue
+++ b/frontend/src/editor/index.vue
@@ -1,34 +1,17 @@
 <script setup lang="ts">
 import {onBeforeUnmount, onMounted, ref, watch} from 'vue';
-import {
-  crosshairCursor,
-  drawSelection,
-  dropCursor,
-  EditorView,
-  highlightActiveLine,
-  highlightActiveLineGutter,
-  highlightSpecialChars,
-  keymap,
-  lineNumbers,
-  rectangularSelection,
-} from '@codemirror/view';
-import {Compartment, EditorState, Extension} from '@codemirror/state';
-import {baseDark, customHighlightActiveLine} from "@/editor/theme/base-dark";
-import {
-  bracketMatching,
-  defaultHighlightStyle,
-  foldGutter,
-  foldKeymap,
-  indentOnInput,
-  indentUnit,
-  syntaxHighlighting
-} from '@codemirror/language';
-import {defaultKeymap, history, historyKeymap, indentSelection,} from '@codemirror/commands';
-import {highlightSelectionMatches, searchKeymap} from '@codemirror/search';
-import {autocompletion, closeBrackets, closeBracketsKeymap, completionKeymap} from '@codemirror/autocomplete';
-import {lintKeymap} from '@codemirror/lint';
-import {fontTheme} from "@/editor/font/font";
+import {EditorState, Extension} from '@codemirror/state';
+import {EditorView} from '@codemirror/view';
 import {useEditorStore} from '@/stores/editor';
+import {createBasicSetup} from './extensions/basicSetup';
+import {
+  createStatsUpdateExtension,
+  getTabExtensions,
+  updateTabConfig,
+  createWheelZoomHandler,
+  applyFontSize,
+  updateStats
+} from './extensions';
 
 const editorStore = useEditorStore();
 
@@ -39,207 +22,90 @@ const props = defineProps({
   }
 });
 
-// 使用Compartment可以动态更新特定的配置而不重建整个编辑器
-const tabSizeCompartment = new Compartment();
-const tabKeyCompartment = new Compartment();
-
 const editorElement = ref<HTMLElement | null>(null);
 
-// 处理滚轮缩放字体
-const handleWheel = (event: WheelEvent) => {
-  // 检查是否按住了Ctrl键
-  if (event.ctrlKey) {
-    // 阻止默认行为（防止页面缩放）
-    event.preventDefault();
-
-    // 根据滚轮方向增大或减小字体
-    if (event.deltaY < 0) {
-      // 向上滚动，增大字体
-      editorStore.increaseFontSize();
-    } else {
-      // 向下滚动，减小字体
-      editorStore.decreaseFontSize();
-    }
-  }
-};
-
-// 自定义Tab键处理函数
-const tabHandler = (view: EditorView): boolean => {
-  // 如果有选中文本，使用indentSelection
-  if (!view.state.selection.main.empty) {
-    return indentSelection(view);
-  }
-
-  // 获取当前的tabSize值
-  const currentTabSize = editorStore.tabSize;
-  // 创建相应数量的空格
-  const spaces = ' '.repeat(currentTabSize);
-
-  // 在光标位置插入空格
-  const {state, dispatch} = view;
-  dispatch(state.update(state.replaceSelection(spaces), {scrollIntoView: true}));
-  return true;
-};
-
-// 获取Tab相关的扩展
-const getTabExtensions = (): Extension[] => {
-  const extensions: Extension[] = [];
-
-  // 设置缩进单位
-  const tabSize = editorStore.tabSize;
-  extensions.push(tabSizeCompartment.of(indentUnit.of(' '.repeat(tabSize))));
-
-  // 如果启用了Tab缩进，添加自定义Tab键映射
-  if (editorStore.enableTabIndent) {
-    extensions.push(tabKeyCompartment.of(keymap.of([{
-      key: "Tab",
-      run: tabHandler
-    }])));
-  } else {
-    extensions.push(tabKeyCompartment.of([]));
-  }
-
-  return extensions;
-};
-
 // 创建编辑器
 const createEditor = () => {
   if (!editorElement.value) return;
 
-  const extensions = [
-    baseDark,
-    fontTheme,
-    lineNumbers(),
-    highlightActiveLineGutter(),
-    highlightSpecialChars(),
-    history(),
-    foldGutter(),
-    drawSelection(),
-    dropCursor(),
-    EditorView.lineWrapping,
-    EditorState.allowMultipleSelections.of(true),
-    indentOnInput(),
-    syntaxHighlighting(defaultHighlightStyle, {fallback: true}),
-    bracketMatching(),
-    closeBrackets(),
-    autocompletion(),
-    rectangularSelection(),
-    crosshairCursor(),
-    highlightSelectionMatches(),
-    customHighlightActiveLine,
-    highlightActiveLine(),
-    keymap.of([
-      ...closeBracketsKeymap,
-      ...defaultKeymap,
-      ...searchKeymap,
-      ...historyKeymap,
-      ...foldKeymap,
-      ...completionKeymap,
-      ...lintKeymap
-    ]),
-    EditorView.updateListener.of(update => {
-      if (update.docChanged || update.selectionSet) {
-        updateStats();
-      }
-    }),
-    ...getTabExtensions()
+  // 获取基本扩展
+  const basicExtensions = createBasicSetup();
+  
+  // 获取Tab相关扩展
+  const tabExtensions = getTabExtensions(
+    editorStore.tabSize,
+    editorStore.enableTabIndent
+  );
+  
+  // 创建统计信息更新扩展
+  const statsExtension = createStatsUpdateExtension(
+    editorStore.updateDocumentStats
+  );
+
+  // 组合所有扩展
+  const extensions: Extension[] = [
+    ...basicExtensions,
+    ...tabExtensions,
+    statsExtension
   ];
 
+  // 创建编辑器状态
   const state = EditorState.create({
     doc: props.initialDoc,
     extensions
   });
 
+  // 创建编辑器视图
   const view = new EditorView({
     state,
     parent: editorElement.value
   });
-
+  
   // 将编辑器实例保存到store
   editorStore.setEditorView(view);
-
-  // 初始化统计
-  updateStats();
-
+  
   // 应用初始字体大小
-  editorStore.applyFontSize();
+  applyFontSize(view, editorStore.fontSize);
+  
+  // 立即更新统计信息，不等待用户交互
+  updateStats(view, editorStore.updateDocumentStats);
 };
 
-// 更新统计信息
-const updateStats = () => {
+// 创建滚轮事件处理器
+const handleWheel = createWheelZoomHandler(
+  editorStore.increaseFontSize,
+  editorStore.decreaseFontSize
+);
+
+// 重新配置编辑器（仅在必要时）
+const reconfigureTabSettings = () => {
   if (!editorStore.editorView) return;
-
-  const view = editorStore.editorView;
-  const state = view.state;
-  const doc = state.doc;
-  const text = doc.toString();
-
-  // 计算选中的字符数
-  let selectedChars = 0;
-  const selections = state.selection;
-  if (selections) {
-    for (let i = 0; i < selections.ranges.length; i++) {
-      const range = selections.ranges[i];
-      selectedChars += range.to - range.from;
-    }
-  }
-
-  editorStore.updateDocumentStats({
-    lines: doc.lines,
-    characters: text.length,
-    selectedCharacters: selectedChars
-  });
-};
-
-// 动态更新Tab配置，不需要重建编辑器
-const updateTabConfig = () => {
-  if (!editorStore.editorView) return;
-
-  // 更新Tab大小配置
-  const tabSize = editorStore.tabSize;
-
-  const view = editorStore.editorView;
-
-  // 更新indentUnit配置
-  view.dispatch({
-    effects: tabSizeCompartment.reconfigure(indentUnit.of(' '.repeat(tabSize)))
-  });
-
-  // 更新Tab键映射
-  const tabKeymap = editorStore.enableTabIndent
-      ? keymap.of([{key: "Tab", run: tabHandler}])
-      : [];
-
-  view.dispatch({
-    effects: tabKeyCompartment.reconfigure(tabKeymap)
-  });
-};
-
-// 重新配置编辑器（仅在必要时完全重建）
-const reconfigureEditor = () => {
-  if (!editorStore.editorView) return;
-
-  // 尝试动态更新配置
-  updateTabConfig();
+  updateTabConfig(
+    editorStore.editorView as EditorView,
+    editorStore.tabSize,
+    editorStore.enableTabIndent
+  );
 };
 
 // 监听Tab设置变化
-watch(() => editorStore.tabSize, () => {
-  reconfigureEditor();
-});
-// 监听Tab缩进设置变化
-watch(() => editorStore.enableTabIndent, () => {
-  reconfigureEditor();
-});
+watch(() => editorStore.tabSize, reconfigureTabSettings);
+watch(() => editorStore.enableTabIndent, reconfigureTabSettings);
 
 onMounted(() => {
   // 创建编辑器
   createEditor();
-
+  
   // 添加滚轮事件监听
   if (editorElement.value) {
     editorElement.value.addEventListener('wheel', handleWheel, {passive: false});
   }
+  
+  // 确保统计信息已更新
+  if (editorStore.editorView) {
+    setTimeout(() => {
+      updateStats(editorStore.editorView as EditorView, editorStore.updateDocumentStats);
+    }, 100);
+  }
 });
 
 onBeforeUnmount(() => {
@@ -247,7 +113,8 @@ onBeforeUnmount(() => {
   if (editorElement.value) {
     editorElement.value.removeEventListener('wheel', handleWheel);
   }
-
+  
+  // 销毁编辑器
   if (editorStore.editorView) {
     editorStore.editorView.destroy();
     editorStore.setEditorView(null);
diff --git a/frontend/src/stores/editor.ts b/frontend/src/stores/editor.ts
index b4c3ad5..2fe0f0a 100644
--- a/frontend/src/stores/editor.ts
+++ b/frontend/src/stores/editor.ts
@@ -118,7 +118,6 @@ export const useEditorStore = defineStore('editor', () => {
         increaseFontSize,
         decreaseFontSize,
         resetFontSize,
-        applyFontSize,
         toggleTabIndent,
         increaseTabSize,
         decreaseTabSize