environmental protect how can
public private protected 的辨析
一. public 1.作为类内成员的访问修饰符时，由public修饰的成员数据或者成员函数可以在类外（即派生类内以及实例化的对象后）以及类内进行随意访问 可以看到public成员Data在类外是可访问的（同理也可修改），但是private成员Private_Data在类外是无法看到访问的。 2.在 ......
Can't import the named export 'inject' from non EcmaScript module (only default export is available)
最近在开发一个electron应用，需要用到ssh功能。 经过挑选，最终使用的是node-ssh这个包。 然而，使用的过程并不顺利，执行npm run electron:serve运行出错，报错信息如下（仅截取部分）： error in ./node_modules/node-ssh/lib/esm ......
CAN总线
CAN —— Controller Area Network（控制器局域网） Controller —— 汽车领域术语 ECU —— electric control unit 电子控制单元 所以CAN是不是理解成 ECU Area Network 汽车电子控制单元局域网 ？ CAN总线协议就是这个 ......
创建LVM报错：Can't initialize physical volume "/dev/sdb1" of volume group "myvg" without -ff
问题： 在使用fdisk /dev/sdb 删除原有LVM分区，在接着创建LVM新分区/dev/sdb1。完毕保存之后。 执行pvcreate /dev/sdb1出现报错 Can't initialize physical volume "/dev/sdb1" of volume group "my ......
How to build a Responsive Website
搭建一个网站一般需要 4 样东西，服务器或者虚拟主机，域名(可以不要但vulnerable)，建站程序和网站素材，网站素材就是文章、图片、视频等 1.服务器或者虚拟主机(web环境) 服务器一般是自带apache或Nginx等web环境的 要求：要求不高的选择虚拟主机，对网站等要求高的选择服务器。 ......
How To Fetch API Data With React
Fetching data from third-party RESTful APIs in React application is a common task when creating web application. This task can be solved easily by usi ......
How to connect production React frontend with a Python backend django连接到React 静态文件
Disclaimer There are multiple possible ways of using React with a backend framework -- steps presented below are showing one possible way of connectin ......
How To Fix the ERR_OSSL_EVP_UNSUPPORTED Error in Node.js
Fix the ERR_OSSL_EVP_UNSUPPORTED Error There are two ways to fix the ERR_OSSL_EVP_UNSUPPORTED error: Upgrade Node.js by downloading and installing the ......
Can't import the named export XXXX from non EcmaScript module (only default export is available)的解决方法
# 解决方法： 1. https://stackoverflow.com/questions/69343038/cant-import-the-named-export-xxxx-from-non-ecmascript-module-only-default-expo 2. https://gith ......
How to Paraphrase?
How do we paraphrase? There are many techniques we can use,but essentially paraphrasing can involve three main features: 1.Changing word class(e.g. ve ......
37.public，protected和private访问和继承权限的区别？
## 37.public，protected和private访问和继承权限的区别？ - public的变量和函数在类的内部外部都可以访问。 - protected的变量和函数只能在类的内部和其派生类中访问。 - private修饰的元素只能在类内访问 派生类可以继承基类中除了构造/析构、赋值运算符重 ......
How to use handleChange() function in react component?
An onChange event is triggered when values are entered in the input. This fires a function handleChange(), that is used to set a new state for the inp ......
CAN--CAN例程中的参数解释
typedef struct { uint16_t CAN_Prescaler; /*配置CAN外设的时钟分频，可设置为1-1024*/ uint8_t CAN_Mode; /*配置CAN的工作模式，回环或正常模式*/ uint8_t CAN_SJW; /*配置SJW极限值 */ uint8_t C ......
react-native项目启动报错 Error: `fsevents` unavailable (this watcher can only be used on Darwin)
react-native项目启动报错——watchman安装问题(mac pro) Looking for JS files in /Users/你的名称/Documents/project/文件夹名 Loading dependency graph.../Users/你的名称/Documents/ ......
dmPython连接达梦数据库，查询含有特殊字符报错'gbk' codec can't decode byte 0xaa in position 22: illegal multibyte sequence
解决方法，可以在应用连接字符串url 连接属性加上local_code=1指定客户端字符编码方式。 #local_code=1 表示执行客户端的本地编码是UTF-8，否则默认是GBKdm_conn = dmPython.connect(user=dm_user, password=dm_passwo ......
CAN转PROFINET协议网关 JM-PN-CAN
1 产品功能 捷米特JM-PN-CAN 是自主研发的一款 PROFINET 从站功能的通讯网关。主要功能是将各种 CAN 设备接入到 PROFINET 网络中。 捷米特JM-PN-CAN连接到 PROFINET 总线中做为从站使用，连接到 CAN 总线中根据节点号进行读写。 2.CAN转PROFIN ......
2023暑假电控组培训第四讲——CAN
* ****前言**** 在RoboMaster比赛中，无论是电机驱动还是板间通信，CAN通信都发挥了极其重要的作用，但是相比于其它基本知识，CAN是一个相对而言比较复杂的通讯协议，有着更多的特性需要去记忆，也因此成为了很多RMer电控入门阶段的美好回忆，本篇文章将从理论出发，结合实践，讲解如何使用 ......
关于内核实时补丁如何工作-How kernel live patching works
kpatch 内核补丁解决方案使用 livepatch 内核子系统将旧功能重定向到新功能，详细的过程及说明如下： The kpatch kernel patching solution uses the livepatch kernel subsystem to redirect old funct ......
Module not found: Error: Can't resolve ' vue-resource'
问题： 在学习vue的过程中出现了这个问题，说明VueResource模块没有安装。 解决方法： 打开终端，进入当前项目所在目录，输入指令 npm install vue-resource --save 然后等待安装，安装好了以后在main.js中引用（下图红色框中代码） ......
How To Install and Enable SSH Server on Debian 10
https://devconnected.com/how-to-install-and-enable-ssh-server-on-debian-10/ How To Install and Enable SSH Server on Debian 10 written by Schkn This tu ......
Tips: How to Get the Currently Selected HTML Content in Major Browsers
```js function getSelectionHtml() { const sel = window.getSelection(); if (sel.rangeCount) { var container = document.createElement("div"); for (var i ......
npm install报gyp ERR! stack Error: Can't find Python executable "python", you can set the PYTHON env variable.没有python环境
1 gyp ERR! stack Error: Can't find Python executable "python", you can set the PYTHON env variable. 2 gyp ERR! stack at PythonFinder.failNoPython (/Us ......
mysql: [Warning] Using a password on the command line interface can be insecure.
https://zhuanlan.zhihu.com/p/542166965 ......
在linux上启动arthas报“Can not find java process”
**发生背景** 完整报错信息： ``` [***@localhost ~]$ java -jar arthas-boot.jar [INFO] JAVA_HOME: /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.222.b03-1.el7.x86_64/jre [IN ......
Pond fish count - how to get it
- # calculate the fish in pond, we can't use the function of average immediately. Due to the fish is swimming everywhere. > - first, we need to get 50 ......
How to Implement Drag and Drop Between Your Program and Explorer
How to Implement Drag and Drop Between Your Program and Explorer Michael Dunn Rate me: 4.90/5 (105 votes) 14 Dec 2002 A step-by-step description of ho ......
解决python中requests请求时报错：UnicodeEncodeError: ‘latin-1‘ codec can‘t encode character
当request请求中，带有中文，可能引发报错：  UnicodeEncodeError: 'latin-1' c ......
系统断电后，MySQL重启失败：[ERROR] Binlog has bad magic number； It‘s not a binary log file that can be used by this version of MySQL
系统断电后，MySQL重启失败： [ERROR] Binlog has bad magic number； It‘s not a binary log file that can be used by this version of MySQL [ERROR] Can't init tc log [ ......
How to understand matrix（Primary）
# What is Matrix? TODO # What is Eigenvector and Eigenvalue？ 任何**只被矩阵缩放**而**不被旋转**的矢量被称为该矩阵的**特征向量**（Eigenvector），而**向量被缩放的程度**称为**特征值**（Eigenvalue）。 ......