diff --git a/src/content/post/编程/前端/1 Share My Incorrect Usage Cases of Zustand.md b/src/content/post/编程/前端/1 Share My Incorrect Usage Cases of Zustand.md
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+---
+title: Share My Incorrect Usage Cases of Zustand
+date: 2024-12-17T00:00:00.000Z
+author: KazooTTT
+type: Post
+status: Published
+tags:
+  - zustand
+  - selector
+  - store
+  - react-scan
+  - 最小粒度原则
+finished: true
+published: true
+category: 编程-前端
+slug: share-my-incorrect-usage-case-of-zustand
+description: Zustand is a state management library that is simple and easy to use. It allows you to access the state via a single selector or shallow comparison to prevent unnecessary re-renders of all components. When the state is updated, you can use `useShallow` to retrieve only the required data. Additionally, you should follow the principle of minimal granularity, only fetching the necessary data instead of using multiple stores to manage different states. Moreover, state that is unrelated to the UI does not need to be accessed via a selector. The correct approach is to directly access the store within the `handleSave` method.
+toAstro: true
+---
+
+## What is Zustand?
+
+[Zustand](https://github.com/pmndrs/zustand) is a simple and easy-to-use state management library.
+
+While using [react-scan](https://react-scan.com/), I noticed that when I updated a state in the store in component A, it caused a re-render of component B, leading to significant performance issues.
+
+So, I revisited the documentation and realized that my previous usage of Zustand was incorrect.
+
+## Mistake 1: Not using a single selector or shallow comparison to get state
+
+Here’s the previous implementation and the corresponding component. `useGlobalStore` has more than just `uploadToServerProgress` and `uploadStatus` states.
+
+```tsx
+const ComponentA = () => {
+  const { uploadToServerProgress, uploadStatus } = useGlobalStore();
+  return (
+    <UploadStateContainer
+      uploadToServerProgress={uploadToServerProgress}
+      uploadStatus={uploadStatus}
+    />
+  );
+};
+```
+
+When `uploadToServerProgress` or `uploadStatus` is updated, `UploadStateContainer` re-renders (as expected). But when other states in `useGlobalStore` are updated, `UploadStateContainer` also re-renders (which is not expected).
+
+This is because `const { uploadToServerProgress, uploadStatus } = useGlobalStore();` is shorthand for destructuring, which is equivalent to:
+
+```tsx
+const globalStore = useGlobalStore();
+const { uploadToServerProgress, uploadStatus } = globalStore;
+```
+
+In React, any update to `globalStore` triggers a re-render of `UploadStateContainer`. Therefore, we need to modify it as follows:
+
+### Solution 1: Use a single selector
+
+```ts
+const uploadToServerProgress = useGlobalStore(state => state.uploadToServerProgress);
+const uploadStatus = useGlobalStore(state => state.uploadStatus);
+```
+
+### Solution 2: Use `useShallow`
+
+```ts
+const { uploadToServerProgress, uploadStatus } = useGlobalStore(useShallow(state => ({
+  uploadToServerProgress: state.uploadToServerProgress,
+  uploadStatus: state.uploadStatus,
+})));
+```
+
+## Mistake 2: Not having sufficient granularity when using selectors
+
+`cameraData` is obtained by subscribing to other services and contains data such as camera image and camera ID. The camera image is frequently updated data.
+
+```tsx
+import React from 'react';
+
+export interface CameraData {
+  cameraBase64: string; // base64 encoded image
+  cameraId: number;
+}
+
+const CurrentCamera: React.FC = () => {
+  const cameraData = useGlobalStore(state => state.cameraData);
+
+  return <CurrentCameraId cameraId={cameraData.cameraId} />;
+};
+```
+
+Though this is using a single selector, when `cameraBase64` updates, `cameraData` will also update, causing `CurrentCameraId` to re-render.
+
+To solve this, follow the principle of minimal granularity and only fetch the required data:
+
+```tsx
+import React from "react";
+
+export interface CameraData {
+  cameraBase64: string; // base64 encoded image
+  cameraId: number;
+}
+
+const CurrentCamera: React.FC = () => {
+  const cameraId = useGlobalStore(state => state.cameraData.cameraId);
+
+  return <CurrentCameraId cameraId={cameraId} />;
+};
+```
+
+## Mistake 3: Using multiple stores to manage different states, instead of using slices to group states
+
+In the official documentation [Flux-inspired practice - Zustand](https://zustand.docs.pmnd.rs/guides/flux-inspired-practice), it is mentioned that you should use a single store, not multiple stores for different states.
+
+> **Recommended patterns**
+> 
+> **Single store**
+> 
+> Your application's global state should be located in a single Zustand store.
+> 
+> If you have a large application, Zustand supports splitting the store into slices.
+
+## Mistake 4: Accessing UI-unrelated state via selectors
+
+In a component, I had a `handleSave` method that called an API to save data.
+
+Previously, I accessed the needed data through a selector within component A and then called the API to save it. But this was incorrect.
+
+```tsx
+const ComponentA = () => {
+  const { state1, state2 } = useGlobalStore(
+    useShallow(state => ({
+      state1: state.state1,
+      state2: state.state2,
+    }))
+  );
+
+  const handleSave = () => {
+    save(state1, state2);
+  };
+
+  return <SaveButton onClick={handleSave} />;
+};
+```
+
+In component B, I changed `state1`, but since I accessed `state1` in component A, the change would cause component A to re-render.
+
+The correct approach is to directly access the store inside the `handleSave` method instead of passing the state via selectors:
+
+```tsx
+const ComponentA = () => {
+  const handleSave = () => {
+    const { state1, state2 } = useGlobalStore.getState();
+    save(state1, state2);
+  };
+
+  return <SaveButton onClick={handleSave} />;
+};
+```
+
+## References
+
+[Zustand](https://zustand-demo.pmnd.rs/)
+
+[master branch notes/zustand learning notes](https://github.com/puxiao/notes/blob/master/zustand%E5%AD%A6%E4%B9%A0%E7%AC%94%E8%AE%B0.md)
+
+[How to efficiently manage React local state? This time I chose Zustand! | Bosh's Technical Exploration Notes](https://notes.boshkuo.com/docs/React/zustand#%E7%82%BA%E4%BD%95%E9%81%B8%E6%93%87%E4%BD%BF%E7%94%A8-zustand-)
\ No newline at end of file
diff --git a/src/content/post/编程/前端/zustand 使用备忘.md b/src/content/post/编程/前端/1 分享一下我的zustand错误使用案例.md
similarity index 99%
rename from src/content/post/编程/前端/zustand 使用备忘.md
rename to src/content/post/编程/前端/1 分享一下我的zustand错误使用案例.md
index 94c7f66..51b49e2 100644
--- a/src/content/post/编程/前端/zustand 使用备忘.md	
+++ b/src/content/post/编程/前端/1 分享一下我的zustand错误使用案例.md	
@@ -1,5 +1,5 @@
 ---
-title: zustand 使用备忘
+title: 分享一下我的zustand错误使用案例
 date: 2024-12-17T00:00:00.000Z
 author: KazooTTT
 type: Post
diff --git a/src/content/post/react-scan的用法.md b/src/content/post/编程/前端/react-scan的用法.md
similarity index 99%
rename from src/content/post/react-scan的用法.md
rename to src/content/post/编程/前端/react-scan的用法.md
index 9832f3a..1a66c12 100644
--- a/src/content/post/react-scan的用法.md
+++ b/src/content/post/编程/前端/react-scan的用法.md
@@ -12,7 +12,7 @@ tags:
   - performance优化
 finished: true
 published: true
-category: null
+category: 编程-前端
 slug: react-scan
 description: >-
   react-scan 是一个用于查看 React 代码中的 re-render
diff --git a/src/content/post/软件/不推荐macos用户购买focusee的理由.md b/src/content/post/软件/不推荐macos用户购买focusee的理由.md
index 69fa93d..d63b11e 100644
--- a/src/content/post/软件/不推荐macos用户购买focusee的理由.md
+++ b/src/content/post/软件/不推荐macos用户购买focusee的理由.md
@@ -16,7 +16,7 @@ category: 软件
 slug: focusee-macos-review
 description: 分析了Focusee在macOS上的缺陷，包括色差严重、导出速度慢以及声卡配置冲突等问题，并分享了作者的退款经历。
 NotionID-notionnext: c6b6e2f5-9da1-43f9-b531-b07d974815ed
-link-notionnext: 'https://kazoottt.notion.site/macos-focusee-c6b6e2f59da143f9b531b07d974815ed'
+link-notionnext: https://kazoottt.notion.site/macos-focusee-c6b6e2f59da143f9b531b07d974815ed
 rinId: 42
 toAstro: true
 ---
diff --git a/src/content/post/项目/已结项/01 合并多个PDF.md b/src/content/post/项目/已结项/01 合并多个PDF.md
new file mode 100644
index 0000000..9f1edb9
--- /dev/null
+++ b/src/content/post/项目/已结项/01 合并多个PDF.md	
@@ -0,0 +1,20 @@
+---
+title: 合并多个PDF
+date: 2024-12-19
+author: KazooTTT
+type: Post
+status: Published
+tags: 
+finished: true
+published: true
+category: 项目-已结项
+slug: merge-pdfs
+description: 
+toAstro: true
+---
+
+地址： 
+
+[PDF文件合并工具 - 在线免费合并PDF文档](https://pdf.kazoottt.top/)
+
+<img src="https://pictures.kazoottt.top/2024/12/20241219-451b26c6ab1c95bfe072e356579ce4af.png"/>