From 6c5e7dc811ff11ab94614021081b3a8064d20fbb Mon Sep 17 00:00:00 2001
From: Developer <developer@example.com>
Date: Tue, 31 Mar 2026 17:36:12 +0800
Subject: [PATCH] =?UTF-8?q?fix:=20=E7=BB=9F=E8=AE=A1=E9=A1=B5=E9=9D=A2?=
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- 添加 useEffect 在 categoryData 加载后自动选中所有分类
- 移除切换类型时清空选中的逻辑，新数据加载后自动全选

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
---
 frontend/pages/stats.js | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/frontend/pages/stats.js b/frontend/pages/stats.js
index 332d1da..d7c1c67 100644
--- a/frontend/pages/stats.js
+++ b/frontend/pages/stats.js
@@ -141,9 +141,15 @@ export default function Stats() {
     setCurrentMonth(newDate);
   };
 
+  // 当分类数据加载后，默认选中所有分类
+  useEffect(() => {
+    if (categoryData.length > 0) {
+      setSelectedCategories(categoryData.map(cat => cat.category));
+    }
+  }, [categoryData]);
+
   const handleCategoryTypeChange = (type) => {
     setCategoryType(type);
-    setSelectedCategories([]); // 切换类型时清空选中
   };
 
   const toggleCategory = (categoryName) => {