patch libs


    1. install patch-package
npm i patch-package --save-dev
    1. modify the source code in third party libs
    1. generate the .patch
npx patch-package @mantine/core
✔ Created file patches/@mantine+core+7.2.2.patch

remove old source and reinstall

rm -rf node_modules/@mantine/core
bun install 
// npm install


jest can not found canvas

npm i jest-canvas-mock --dev

and add 'canvas' : 'jest-canvas-mock' to moduleNameMapper in jest.config.js.

jest css, svg ...

module.exports = {
    "roots": [
    "modulePaths": [
    // "moduleDirectories": [
        // "node_modules"
    // ],
    moduleNameMapper: {
        "@mantine/core/styles.css": "<rootDir>/node_modules/@mantine/core/esm/index.css",
        // "@mantine/core/(.*).css": "<rootDir>/node_modules/@mantine/core/esm/$1.css",
    transform: {
        "^.+\\.[t|j]sx?$": "babel-jest",
        "^.+\\App.css$": "jest-transform-css",
        ".+\\.(styl|less|sass|scss|png|jpg|ttf|woff|woff2|svg)$": "jest-transform-stub"

jest test throw case

Use a clouse function wrap the test case and check if the result throw an Error.

test('Convert Color to RGBA', ()=>{

    const { toRGBA } = colorConvertor();

    expect( ()=>{ toRGBA("#333444",1000) } ).toThrow(RangeError);
    expect( ()=>{ toRGBA("#333444",-1) } ).toThrow(RangeError);
    expect( ()=>{ toRGBA("#331",50) } ).toThrow(Error);

    expect( toRGBA('#ff3366',100) ).toBe('ff3366ff');

jest wrong environment

    The error below may be caused by using the wrong test environment, see
    Consider using the "jsdom" test environment.

npm install --save-dev jest babel-jest @babel/preset-env @babel/preset-react react-test-renderer

Jest test fails with "window is not defined"

add globals window to jest.config.js

module.exports = {
    globals: {
        "window": {}

TypeError: Cannot read properties of undefined (reading 'html')

npm install --dev jest-environment-jsdom

jsdom environment

    The error below may be caused by using the wrong test environment, see
    Consider using the "jsdom" test environment.

    ReferenceError: document is not defined
 * @jest-environment jsdom
import '../jest.mock'
import React from 'react';
import {cleanup, render, screen} from '@testing-library/react';
import App from './App';

test('Render App', () => {
    // ...

Class constructor Stage cannot be invoked without 'new'

use ts-jest instead of jest

TypeError: window.matchMedia is not a function


Object.defineProperty(window, 'matchMedia', {
    writable: true,
    value: jest.fn().mockImplementation(query => ({
        matches: false,
        media: query,
        onchange: null,
        addListener: jest.fn(), // deprecated
        removeListener: jest.fn(), // deprecated
        addEventListener: jest.fn(),
        removeEventListener: jest.fn(),
        dispatchEvent: jest.fn(),


import '../jest.mock'

git log --all -- ${dirname}

# choose the COMMIT_TAG that removed the folder 

git checkout ${COMMIT_TAG}^ ${pathtodir}${dirname}

# 重置当前分支的 HEAD 指针到指定的提交
git reset ${COMMIT_TAG} -- ${pathtodir}${dirname}

git revert  -n ${COMMIT_TAG}
git commit -m "revert this commit"

Sometimes, we need to run a script to modify saveral files at once.

We can use xargs on shell tube.

ls | xargs echo 

As the command before, xargs run echo and use the result from ls.

this example shows how to use xargs modify all index.html that change *.js to *.js?ver=xxx


# set version for  .css .js files
find -name "index.html" | xargs -i cp {} {}.bak 

find -name "index.html" | xargs sed -i 's@\.js.*\"@.js?ver='${verStr}'\"@g'

# reset files
# find -name "index.html" | xargs -i mv {}.bak {} 

在进行嵌入式开发的时候,文件传输是比较麻烦的 在调试过程中,最方便的方式是使用nfs进行文件目录共享 记录一下在设备和ubuntu之间共享的方法


1. 安装和开启nfs-server服务

sudo apt install nfs-kernel-server

2. 配置共享文件目录

此时可以创建一个新目录 或者使用 开发目录来进行共享,这里以 /home/my/dev 为例

sudo vi /etc/exports


/home/my/dev  192.168.*(rw,sync,no_root_squash)

如果出现Protocol not supported 可以在 /etc/default/nfs-kernel-server末尾添加

PRCNFSDORTS="--nfs-version 2,3,4 --debug --syslog"

3. 刷新服务

sudo systemctl restart nfs-server.service

4. 检查状态

sudo exportfs -v





  1. 直接使用buildroot官方版本的 defconfig文件 无法打开显卡驱动 系统大小约100M 可以通过fbdev的驱动显示画面,但是没有gpu的情况下,整个画面性能非常糟糕。 此时,尝试使用weston+drm+egl的方式,失败报错。 ls /dev/dri 无法找到节点 尝试使用insmod 加载 drm.ko 等模块,无效 经过比较 buildroot的defconfg和 raspberry git上提供的不一样,改用树莓派提供的buildroot

  2. 使用raspberry提供的buildroot版本依然不能打开 drm 此时显卡驱动是以模块形式编译需要通过模块加载启动

    modprobe i2c_brcmstb
    modprobe vc4
    modprobe v3d
    modprobe snd_soc_hdmi_codec
  3. 成功加载drm和 v3d v4c后 ,运行weston

    [00:24:19.786] warning: no input devices on entering Weston. Possible causes:
         - no permissions to read /dev/input/event*
         - seats misconfigured (Weston backend option 'seat', udev device property ID_SEAT)

驱动解决后,无法创建gl context

libGL: Can't open configuration file /etc/drirc: No such file or directory.
libGL: Can't open configuration file /root/.drirc: No such file or directory.

daisyUI daisyUI — Tailwind CSS Components WebdaisyUI is a plugin for Tailwind CSS. It works on all JS frameworks and doesn't need a JS bundle file. Install daisyUI as a dev dependency and use the class names just like any …

Chakra UI Chakra UI - A simple, modular and accessible component … WebCreate accessible React apps. with speed. Chakra UI is a simple, modular and accessible component library that gives you the building blocks you need to build your React applications.

mantine (UI)

Global web icon React Icons - GitHub Pages WebReact Icons. Include popular icons in your React projects easily with react-icons, which utilizes ES6 imports that allows you to include only the icons that your project is using. …


Over 4850 pixel-perfect icons for web design Free and open source icons designed to make your website or app attractive, visually consistent and simply beautiful.

Introduction to Immer

GitHub Pages › immer Immer (German for: always) is a tiny package that allows you to work with immutable state in a more convenient way. ‎React & Immer · ‎Using produce · ‎Supporting immer · ‎Installation



  1. use-immer库的高级用法 下面我们将介绍use-immer库的高级用法,包括:

3.1 使用produce函数 produce函数是use-immer库中最重要的函数之一。它可以帮助我们更加方便地管理和更新JavaScript对象和数组。下面是一个简单的例子:

import { produce } from 'immer';
const state = {
  todos: [
    { id: 1, text: 'Learn React', completed: true },
    { id: 2, text: 'Learn use-immer', completed: false },
const nextState = produce(state, draftState => {
  draftState.todos.push({ id: 3, text: 'Learn Redux', completed: false });


react snippets

a quick way to create a code template for a component or etc...



ref is a reference to a element but ref maybe null


transform several properties

const obj = {
    className: "none",
    size: 14,
    color: "red"

    { ... obj }



... means    loop the obj and set each key to the value

zod , joi , ... validation libs

import { z } from 'zod';

// create the limites
const schema = z.object({
    name: z.string().min(3, {"message":"at least 3 characters."}),
    age: z.number({invalid_type_error:"required"}).min(18) // the api shoud be mobile and ...

// create the  interface for data
type FormData = Formz.infer<typeof schema>;
const {
    formState: {errors,isValid}
} = 
useForm<FormData>( { resolver: zodResolver(schema) } );

useEffect is similar to a "OnRendered" Callback when JSX modules is rendered then react call this function


the finally method will be called both succeed or failed when fetch on axios

?. optional link

seemly to swift syntax

obj?.type means obj && obj.type

Abort Signal

Mozilla Developer AbortSignal - Web APIs | MDN WebAug 4, 2023 · English (US) AbortSignal. The AbortSignal interface represents a signal object that allows you to communicate with a DOM request (such as a fetch request) and abort it …

const controller = new AbortController();
const signal = controller.signal;

const url = "video.mp4";
const downloadBtn = document.querySelector(".download");
const abortBtn = document.querySelector(".abort");

downloadBtn.addEventListener("click", fetchVideo);

abortBtn.addEventListener("click", () => {
  console.log("Download aborted");

function fetchVideo() {
  fetch(url, { signal })
    .then((response) => {
      console.log("Download complete", response);
    .catch((err) => {
      console.error(`Download error: ${err.message}`);


Mozilla Developer Array.prototype.reduce() - JavaScript | MDN - MDN Web … WebSep 14, 2023 · Array.prototype.reduce () Try it. The reducer walks through the array element-by-element, at each step adding the current array value to the... Syntax.

JavaScript Array filter()

WebThe filter () method creates a new array filled with elements that pass a test provided by a function. The filter () method does not execute the function for empty elements.

随着智能化在生活的方方面面深入,家电设备上的智能化需求也是在不断增长。 同时伴随着芯片行业的飞速发展、芯片的国产化进程不断推进,在家用电器上内嵌一块显示屏、并且提供智能化的设备服务已经成为一个行业趋势。




a. 其智能化的程度主要体现在用户通过直觉体验能够对于设备操作的精细度以及完成复杂的组合式目标的便捷和直观程度上。


- 阅读剩余部分 -


img_decoded 是用于解码图片并且将图片绘制到指定buffer区域。

void lv_draw_sw_img_decoded
struct _lv_draw_ctx_t * draw_ctx,
const lv_draw_img_dsc_t * draw_dsc,
const lv_area_t * coords, 
const uint8_t * src_buf, 
lv_img_cf_t cf

    struct _lv_draw_ctx_t * draw_ctx        // 绘制上下文
    const lv_draw_img_dsc_t * draw_dsc      // 图像素材绘制描述
    const lv_area_t * coords                // 绘制区(图像在output buffer上的绝对定位)
    const uint8_t * src_buf                  // 图像buffer
    lv_img_cf_t cf                          // 图像色彩格式


typedef struct _lv_draw_ctx_t  {
     *  Pointer to a buffer to draw into
    void * buf;

     * The position and size of `buf` (absolute coordinates)
    lv_area_t * buf_area;

     * The current clip area with absolute coordinates, always the same or smaller than `buf_area`
    const lv_area_t * clip_area;

} lv_draw_ctx_t;


typedef struct {

    int16_t angle;
    uint16_t zoom;
    lv_point_t pivot;

    lv_color_t recolor;
    lv_opa_t recolor_opa;

    lv_opa_t opa;
    lv_blend_mode_t blend_mode : 4;

    int32_t frame_id;
    uint8_t antialias       : 1;
} lv_draw_img_dsc_t;

在进行macOS嵌入式调试的时候,用gdbserver报错 使用pyenv安装2.7之后同样无果,后使用安装包安装解决

dyld[675]: Library not loaded: /System/Library/Frameworks/Python.framework/Versions/2.7/Python
  Referenced from: <26C16900-9C5F-32FC-9593-0458A2B42E1C> /Users/mac/dev/arm-unknown-linux-gnueabihf/bin/arm-unknown-linux-gnueabihf-gdb
  Reason: tried: '/System/Library/Frameworks/Python.framework/Versions/2.7/Python' (no such file), '/System/Volumes/Preboot/Cryptexes/OS/System/Library/Frameworks/Python.framework/Versions/2.7/Python' (no such file), '/System/Library/Frameworks/Python.framework/Versions/2.7/Python' (no such file, not in dyld cache), '/Library/Frameworks/Python.framework/Versions/2.7/Python' (no such file)

copied from:

As of macOS 12.3+, Python 2 which was installed by default at /usr/bin/python have been removed. This can lead to a lot of issues for developers that need to use Python 2 or that use other tools that depend on it.

Install Python 2 To install Python2 again, simply download the macOS universal installer from Python's website

After downloading the installer run it to install Python 2. This will automatically install Python in /usr/local/python as well.

Test it Out You can run Python 2 in your terminal now and other tools using it will no longer have issues: