DEV Community: qianduan

让代码更加整洁

qianduan — Wed, 18 Mar 2026 09:23:17 +0000

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模板模式
单例模式

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找到性价比最高的提效方式,分析流程,找到其中的瓶颈,提升后重新分析瓶颈如此循环

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Use open api to request

qianduan — Tue, 17 Mar 2026 12:02:04 +0000

现在系统的相关请求是通过cookie传递的,现在要切换成通过openAPI,open API的机制是在头部设置将 AccessToken 置于业务接口的 header 参数中，key 为 Authorization ; 在URL 请求参数中携带随机字符串和签名.获取token的方法和签名的方法都已经实现,使用openapi的方式进行请求可以更加安全

slowly install for pulsar

qianduan — Fri, 13 Mar 2026 08:09:53 +0000

in package.json we install

"scripts": { "postinstall": "cd ./node_modules/.pnpm/pulsar-client@1.12.0/node_modules/pulsar-client && pnpm run install", "start": "cross-env NODE_ENV=development nodemon --watch app -e ts,tsx --exec ts-node --require tsconfig-paths/register --files app/index.ts", "beautify": "npx prettier --write \"**/*.{js,ts,json,html,scss,css}\"" },
"dependencies": {

"pulsar-client": "1.12.0",
"pulsar-flex": "^1.1.1",

add the following config into your .npmrc file to enhance the speed

pulsar_binary_host_mirror=https://mirrors.huaweicloud.com/apache/pulsar/pulsar-client-node/

solve download issue for nodejs

qianduan — Wed, 11 Mar 2026 03:35:28 +0000

add the following settings in .npmrc file

registry=http://npm.ddxq.mobi/
disturl=https://npmmirror.com/mirrors/node
NODEJS_ORG_MIRROR=https://npmmirror.com/mirrors/node

Introduction to mujoco

qianduan — Tue, 10 Mar 2026 11:13:30 +0000

set environment

echo "export PATH=$PATH:/Users/chenxiangyun05/MuJoCoBin/mujoco-3.3.0/bin" >> ~/.bashrc

source ~/.bashrc

既然你是 Bash，那么环境变量就应该写入 ~/.bash_profile（注意：不是 ~/.bashrc！）

💡 macOS 上 Bash 的加载规则很特殊：

登录式 shell（比如你打开 Terminal.app）会读取 ~/.bash_profile
不会自动读取 ~/.bashrc
而 Linux 上的 Bash 通常读 ~/.bashrc
所以你之前写入 ~/.bashrc 是无效的！

注意：这里写入的是 ~/.zshrc，不是 ~/.bashrc！

echo 'export PATH="$PATH:/Users/chenxiangyun05/MuJoCoBin/mujoco-3.3.0/bin"' >> ~/.zshrc

source ~/.zshrc

方法 1：查看当前 Shell 进程
Bash
编辑
echo $0
如果输出是 -zsh 或 /bin/zsh → 你正在用 Zsh
如果输出是 -bash 或 /bin/bash → 你正在用 Bash

view model

simulate ~/MuJoCoBin/mujoco-3.3.0/model/humanoid/humanoid.xml

record

record ~/MuJoCoBin/mujoco-3.3.0/model/humanoid/humanoid.xml 5 60 rgb.out

save to mp4

ffmpeg -f rawvideo -pixel_format rgb24 -video_size 2560x1440 \
-framerate 60 -i rgb.out -vf "vflip,format=yuv420p" video.mp4

reference:

g++ 编译

g++ ~/c++/test.cpp \
-F /Users/chenxiangyun05/.mujoco \
-I /Users/chenxiangyun05/.mujoco/mujoco.framework/Headers \
-std=c++17 \
-Wl,-rpath,/Users/chenxiangyun05/.mujoco/mujoco.framework/Versions/A \
/Users/chenxiangyun05/.mujoco/mujoco.framework/Versions/A/mujoco \
-o ~/c++/test

g++ ~/c++/stimulate_ball.cpp \
-F /Users/chenxiangyun05/.mujoco \
-I /Users/chenxiangyun05/.mujoco/mujoco.framework/Headers \
-std=c++17 \
-Wl,-rpath,/Users/chenxiangyun05/.mujoco/mujoco.framework/Versions/A \
/Users/chenxiangyun05/.mujoco/mujoco.framework/Versions/A/mujoco \
-o ~/c++/stimulate_ball

How to use js in nginx

qianduan — Mon, 22 Sep 2025 09:44:43 +0000

I heard that js can be used in nginx. nginx has use quickjs ,so we can use js in nginx config. That is exciting to me, I want to try it.
But when I see the doc, I am crying. It is so complicated. I have to download source for njs and quickjs, and nginx. After all three source download, I have to run configure \ make && make install . Oh my god
I try to download all the source files

git clone https://github.com/nginx/njs

 wget http://nginx.org/download/nginx-1.25.3.tar.gz  # 确保版本 ≥ 1.23.0


# 下载 OpenSSL 源码（以 3.0.8 为例）
wget https://www.openssl.org/source/openssl-3.0.8.tar.gz
tar -zxvf openssl-3.0.8.tar.gz
cd openssl-3.0.8


 git clone https://github.com/bellard/quickjs
 cd quickjs/
CFLAGS='-fPIC' make libquickjs.a  # 生成位置无关代码


project_root/
├── nginx-1.25.3/       # Nginx 源码目录
└── quickjs/            # QuickJS 源码目录（需手动创建或克隆）
└── njs/            # QuickJS 源码目录（需手动创建或克隆）


# 授予当前用户读取权限
sudo chmod -R 755 ../quickjs

I feel so disappointed. We need to configure the file with command below

./configure  --add-dynamic-module=../njs/nginx --with-openssl=../openssl-3.0.8  --with-cc-opt="-I $(pwd)/../quickjs"  --with-ld-opt="-L $(pwd)/../quickjs"

After configure step, we still need to make and make install

make && sudo make install

I run nginx start .something wrong again, It shows mismatch for njs and nginx. I try to run command

whereis nginx

nginx: /opt/homebrew/bin/nginx /opt/homebrew/share/man/man8/nginx.8

It seems that I dont use the nginx I compiled. I tried to use direct path for nginx and then It can not find correct config file. So I decide to use all direct path

./objs/nginx -c ~/workspace/nginx-1.25.3/conf/nginx.conf

even if the config file use direct path

Stop the nginx

./objs/nginx -c ~/workspace/nginx-1.25.3/conf/nginx.conf -s stop

start

./objs/nginx -c ~/workspace/nginx-1.25.3/conf/nginx.conf

visit the http://localhost

{
  "message": "Request processed at 1758537787024",
  "stats": {
    "headerCount": 15,
    "customHeaders": 0
  },
  "serverInfo": "GET / HTTP/1.1"
}

basic guide to anroid development

qianduan — Mon, 01 Sep 2025 08:38:23 +0000

gradlew Gradle Wrapper,use gradlew to build
pay attention to settings in gradle: in fact there are two kinds of gradle file, one for project one for app. In gradle file, we set target SDK version and jdk version
do not upgrade key versions: 1. target SDK version 2. jdk version
sync if necessary: when update settings file,there will be a sync button shown, click the sync button to sync
use mirror to accelarate your maven source:

How to set access rights

qianduan — Fri, 29 Aug 2025 08:37:13 +0000

add auth string into route meta
add auth string map into power managment
add route in application and add auth stirng added step1 and step2
add auth string to role
add people into role if needed

How to build anroid application

qianduan — Thu, 28 Aug 2025 07:16:58 +0000

// debugImplementation 'com.squareup.leakcanary:leakcanary-android:1.5.4'
debugImplementation 'com.squareup.leakcanary:leakcanary-android:2.14'

Use alasql to use sql feature in web

qianduan — Thu, 28 Aug 2025 07:09:00 +0000

why frontend developer is always get hurt

qianduan — Fri, 22 Aug 2025 05:05:22 +0000

directly face the UI process problems
act a a tool to support many projects
always be looked down upon by backend developer
can not show value
not farmiliiar with business

how to totally automatically generate vue form

qianduan — Thu, 21 Aug 2025 12:05:31 +0000

generate a list ,each item has attributes like [{title: '', key:'',placeHolder: ''}]
when post data,put all the key values in one object
when query data from backend,all the value stored in one object. then we can use model to map each key