diff --git a/README.md b/README.md
index 502b05f..b75d923 100644
--- a/README.md
+++ b/README.md
@@ -125,6 +125,7 @@ Show doc comment in the Project view Tree, line End, json, other
 
 <h2>English Change Notes:</h2>
 <ul>
+<li>2.21  Add project-view-tree use JS/TS/Vue "export default" doc for tree doc
 <li>2.20  Add External Comment  support Vue src/router tree doc
 <li>2.19  ★   line-end-comment  support HTML(Vue) Tag/Attr doc since 2022.3.1
 <li>2.18  Add line-end-comment  support injected language like SQL
@@ -174,6 +175,7 @@ Show doc comment in the Project view Tree, line End, json, other
 
 <h2>中文更新说明:</h2>
 <ul>
+<li>2.21  增加 文件树注释  用 JS/TS/Vue "export default" 注释当文件注释
 <li>2.20  增加 外部注释   支持 Vue 路由标题文件树注释
 <li>2.19  ★   行末注释   支持 HTML(Vue) 标签/属性 注释从 2022.3.1 起
 <li>2.18  增加 行末注释   支持注入语言如 SQL
diff --git a/build.gradle b/build.gradle
index ccb4a10..9013590 100644
--- a/build.gradle
+++ b/build.gradle
@@ -4,7 +4,7 @@ plugins {
 }
 
 group 'io.github.linwancen'
-version '2.20.0.' + (new Date().format('yyyy.MM.dd_HH.mm'))
+version '2.21.0.' + (new Date().format('yyyy.MM.dd_HH.mm'))
 
 repositories {
     mavenCentral()
@@ -95,6 +95,7 @@ patchPluginXml {
     changeNotes = """
 <h2>English Change Notes:</h2>
 <ul>
+<li>2.21  Add project-view-tree use JS/TS/Vue "export default" doc for tree doc
 <li>2.20  Add External Comment  support Vue src/router tree doc
 <li>2.19  ★   line-end-comment  support HTML(Vue) Tag/Attr doc since 2022.3.1
 <li>2.18  Add line-end-comment  support injected language like SQL
@@ -144,6 +145,7 @@ patchPluginXml {
 
 <h2>中文更新说明:</h2>
 <ul>
+<li>2.21  增加 文件树注释  用 JS/TS/Vue "export default" 注释当文件注释
 <li>2.20  增加 外部注释   支持 Vue 路由标题文件树注释
 <li>2.19  ★   行末注释   支持 HTML(Vue) 标签/属性 注释从 2022.3.1 起
 <li>2.18  增加 行末注释   支持注入语言如 SQL
diff --git a/src/main/java/io/github/linwancen/plugin/show/lang/HtmlLangDoc.java b/src/main/java/io/github/linwancen/plugin/show/lang/HtmlLangDoc.java
index ae71d77..05e463c 100644
--- a/src/main/java/io/github/linwancen/plugin/show/lang/HtmlLangDoc.java
+++ b/src/main/java/io/github/linwancen/plugin/show/lang/HtmlLangDoc.java
@@ -64,7 +64,11 @@ public class HtmlLangDoc extends JsLangDoc {
     public @Nullable <T extends SettingsInfo> String treeDoc(@NotNull T info, @NotNull ProjectViewNode<?> node,
                                                              @NotNull Project project) {
         @Nullable VirtualFile virtualFile = node.getVirtualFile();
-        return VueRouterCache.fileDoc(virtualFile);
+        @Nullable String doc = VueRouterCache.fileDoc(virtualFile);
+        if (doc != null) {
+            return doc;
+        }
+        return super.treeDoc(info, node, project);
     }
 
     /**
diff --git a/src/main/java/io/github/linwancen/plugin/show/lang/JsLangDoc.java b/src/main/java/io/github/linwancen/plugin/show/lang/JsLangDoc.java
index 5d0126c..06e1444 100644
--- a/src/main/java/io/github/linwancen/plugin/show/lang/JsLangDoc.java
+++ b/src/main/java/io/github/linwancen/plugin/show/lang/JsLangDoc.java
@@ -1,13 +1,21 @@
 package io.github.linwancen.plugin.show.lang;
 
+import com.intellij.ide.projectView.ProjectViewNode;
+import com.intellij.lang.ecmascript6.psi.ES6ExportDefaultAssignment;
 import com.intellij.lang.javascript.JavascriptLanguage;
 import com.intellij.lang.javascript.documentation.JSDocumentationUtils;
 import com.intellij.lang.javascript.psi.JSPsiReferenceElement;
+import com.intellij.openapi.project.Project;
+import com.intellij.openapi.vfs.VirtualFile;
 import com.intellij.psi.PsiComment;
 import com.intellij.psi.PsiElement;
+import com.intellij.psi.PsiFile;
+import com.intellij.psi.PsiManager;
+import com.intellij.psi.util.PsiTreeUtil;
 import io.github.linwancen.plugin.show.bean.LineInfo;
 import io.github.linwancen.plugin.show.bean.SettingsInfo;
 import io.github.linwancen.plugin.show.lang.base.BaseLangDoc;
+import io.github.linwancen.plugin.show.lang.vue.VueRouterCache;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
@@ -29,6 +37,32 @@ public class JsLangDoc extends BaseLangDoc {
         return info.appSettings.showLineEndCommentJs;
     }
 
+    @Override
+    public @Nullable <T extends SettingsInfo> String treeDoc(@NotNull T info, @NotNull ProjectViewNode<?> node,
+                                                             @NotNull Project project) {
+        @Nullable VirtualFile virtualFile = node.getVirtualFile();
+        if (virtualFile == null) {
+            return null;
+        }
+        @Nullable PsiFile psiFile = PsiManager.getInstance(project).findFile(virtualFile);
+        if (psiFile == null) {
+            return null;
+        }
+        @Nullable ES6ExportDefaultAssignment export = PsiTreeUtil.findChildOfType(psiFile,
+                ES6ExportDefaultAssignment.class);
+        if (export == null) {
+            return null;
+        }
+        @Nullable String doc = resolveDocPrint(info, export);
+        if (doc != null && "index".equals(virtualFile.getNameWithoutExtension())) {
+            VirtualFile parent = virtualFile.getParent();
+            if (parent != null) {
+                VueRouterCache.DOC_CACHE.put(parent, doc);
+            }
+        }
+        return doc;
+    }
+
     @Override
     public @Nullable <T extends SettingsInfo> String resolveDocRaw(@NotNull T info, @NotNull PsiElement resolve) {
         @Nullable PsiComment psiComment = JSDocumentationUtils.findOwnDocCommentForImplicitElement(resolve);
diff --git a/src/main/java/io/github/linwancen/plugin/show/lang/vue/VueRouterCache.java b/src/main/java/io/github/linwancen/plugin/show/lang/vue/VueRouterCache.java
index 31ddbec..1c2ae08 100644
--- a/src/main/java/io/github/linwancen/plugin/show/lang/vue/VueRouterCache.java
+++ b/src/main/java/io/github/linwancen/plugin/show/lang/vue/VueRouterCache.java
@@ -28,6 +28,7 @@ import org.slf4j.LoggerFactory;
 
 import java.util.Collection;
 import java.util.List;
+import java.util.Locale;
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 
@@ -37,7 +38,7 @@ import java.util.concurrent.ConcurrentHashMap;
 public class VueRouterCache extends FileLoader {
     private static final Logger LOG = LoggerFactory.getLogger(VueRouterCache.class);
 
-    private static final Map<VirtualFile, String> DOC_CACHE = new ConcurrentHashMap<>();
+    public static final Map<VirtualFile, String> DOC_CACHE = new ConcurrentHashMap<>();
 
     @Nullable
     public static String fileDoc(@Nullable VirtualFile virtualFile) {
@@ -157,7 +158,7 @@ public class VueRouterCache extends FileLoader {
                 }
             }
             if (title != null) {
-                VirtualFile file = parseComponent(obj);
+                @Nullable VirtualFile file = parseComponent(obj);
                 if (file != null) {
                     virtualFile = file;
                     DOC_CACHE.put(virtualFile, title);
@@ -186,6 +187,16 @@ public class VueRouterCache extends FileLoader {
             return null;
         }
         @Nullable JSExpression value = titleProp.getValue();
+        if (value instanceof JSObjectLiteralExpression) {
+            @NotNull JSObjectLiteralExpression i18n = (JSObjectLiteralExpression) value;
+            // zh_CN
+            @NotNull String lang = Locale.getDefault().toString();
+            @Nullable JSProperty langProp = i18n.findProperty(lang);
+            if (langProp == null) {
+                return null;
+            }
+            value = langProp.getValue();
+        }
         if (value instanceof JSLiteralExpression) {
             return ((JSLiteralExpression) value).getStringValue();
         }
@@ -227,7 +238,7 @@ public class VueRouterCache extends FileLoader {
         }
         @NotNull Collection<PsiElement> elements = importCall.resolveReferencedElements();
         for (PsiElement element : elements) {
-            PsiFile psiFile = PsiTreeUtil.getParentOfType(element, PsiFile.class);
+            @Nullable PsiFile psiFile = PsiTreeUtil.getParentOfType(element, PsiFile.class);
             if (psiFile != null) {
                 return psiFile.getVirtualFile();
             }