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  • 报错“nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)”2022-04-25 23:34:07

      启动nginx出现: [root@WALKER sbin]# ./nginx nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)n

  • How to use lspci, lsscsi, lsusb, and lsblk to get Linux system devices information2022-04-24 19:33:27

    There are many utilities available to check Linux system hardware information. Some commands report altogether like CPU, Processor, memory, storage, disk, etc,. and the rest will cover only specific hardware components like CPU or processor or memory, etc

  • IDEA取消自动import.*2022-04-22 11:04:20

    打开设置 > Editor > Code Style > Java > Scheme Default > Imports ① 将 Class count to use import with "" 改为 99 (导入同一个包的类超过这个数值自动变为 * ) ② 将 Names count to use static import with "" 改为 99 (同上,但这是静态导入的) ③ 将 Package to Use import

  • nvm 在windows下使用“nvm use ”乱码问题2022-04-21 16:02:52

    错误如下: 使用管理身份运行power面板即可  

  • pycharm安装第三方库:Try to run this command from the system terminal. Make sure that you use the,亲测已解2022-04-20 10:02:00

    之前在做实验的时候用pycharm安装第三方工具包的时候出现了如下问题Try to run this command from the system terminal。   虽然在pycharm当中会出现这个问题,但是当我使用cmd命令行执行pip install的时候没有发生错误,但是如果每次要安装的时候都去手动执行install命令则太过于

  • 《Effective C++》 rule 03: Use const whenever possible2022-04-19 01:00:21

    const 可以修饰哪些东西? const 可以修饰全局 (global) 或命名空间 (namespace) 或类外部的常量. const 也可以修饰文件、函数或作用域中(block scope)被声明为 static 的对象. const 还可以修饰类内部的静态 (static) 和非静态 (non-static) 成员变量. const 与指针结合时,co

  • 关于面向对象的四种关系2022-04-17 20:01:33

    今天学习设计模式时,涉及到了面向对象的四种关系,当时竟然没有印象,所以来记录一下,以便之后的学习查找: 1.is-a关系:表示子类和父类之间的继承关系。 2.has-a关系:表示的是从属关系(也叫组合关系)。例如:比如兔子包含有腿,头等组件;就不能说兔子腿是属于一种兔子(不能说是继承关系)这些就是从

  • 12_09、一些常用配置2022-04-17 01:33:30

    一、国际化 LANGUAGE_CODE = 'zh-hans' TIME_ZONE = 'Asia/ShangHai' USE_I18N = True USE_L10N = True USE_TZ = False  二、国内镜像源 1.阿里云:https://mirrors.aliyun.com/pypi/simple/2.豆瓣:https://pypi.douban.com/simple/3.清华大学:https://pypi.tuna.tsinghu

  • npm更改镜像源2022-04-14 17:35:02

    (查看自己使用的哪个npm源) npm config get registry 安装arm(管理npm源) npm i nrm -g 查看npm源 nrm ls     切换npm源 nrm use taobao(镜像源) 其他正常使用 npm i (加载配置)

  • 报错 This is a development server. Do not use it in a production deployment.Use a production2022-04-12 18:31:51

    WARNING: This is a development server. Do not use it in a production deployment.Use a production WSGI server instead     用gevent包里的pywsgi 优点:速度快,第三方开发维护 if __name__ == '__main__': from gevent import pywsgi server = pywsgi.WSGIServer(('0.0.

  • 数据库语句2022-04-12 13:34:44

    查看所有数据库show databases; 使用数据库use 数据库名; 查看当前使用的数据库select database(); 查看当前数据库中的所有表show tables; 创建数据库create database 数据库名; 删除数据库drop database 数据库名;

  • C++与C#方法命名的不同2022-04-12 11:35:16

    C++与C#方法命名的不同 C#的命名规范 ✔️ DO use PascalCasing for all public member, type, and namespace names consisting of multiple words. ✔️ DO use camelCasing for parameter names. ❌ DO NOT capitalize each word in so-called closed-form compound words. ❌ DO

  • My Onair Privacy Policy2022-04-10 21:02:41

            My Onair is a Masoair (hereinafter referred to as "we") provide products. When you use our services, we may collect and use your relevant information. We hope to explain to you through this "Privacy Policy" how we collect, use,

  • 选择和创建数据库,删除,2022-04-10 03:01:56

    选择和创建数据库的语法格式: use 数据库名称 如果数据库不存在则自动创建,例如,以下语句创建 spitdb 数据库: use dss 查看有权限查看的所有的数据库命令 show dbs 或show databases 查看当前正在使用的数据库命令 db MongoDB 中默认的数据库为 test,如果你没有选择数据库,集合

  • Markdown For Typora2022-04-06 23:34:43

    Markdown For Typora Overview Markdown is created by Daring Fireball; the original guideline is here. Its syntax, however, varies between different parsers or editors. Typora is using GitHub Flavored Markdown. 目录Markdown For TyporaOverviewBlock ElementsPar

  • Send same packets to multiple clients2022-04-06 20:31:54

    https://stackoverflow.com/questions/4883689/send-same-packets-to-multiple-clients   question: I have to develop a software to send same packets to multiple destination. But i must not use multicast scheme.!!!! ( because my boss is a stupid man ) so, any w

  • BZOJ2654 tree (wqs二分)2022-04-05 10:04:47

    题目描述 给你一个无向带权连通图,每条边是黑色或白色。让你求一棵最小权的恰好有need条白色边的生成树。 题目保证有解。   一个最小生成树问题,但是我们要选need条白边,我们用g(i)表示选取i条白边的最优方案(生成树的权值最小),那么可以大致猜出g(i)是关于i的一个下凸函数,可以发现斜

  • php ini_set的用法介绍2022-04-01 15:35:21

    PHP ini_set用来设置php.ini的值,在函数执行的时候生效,脚本结束后,设置失效。无需打开php.ini文件,就能修改配置,对于虚拟空间来说,很方便。函数格式:string ini_set(string $varname, string $newvalue)不是所有的参数都可以配置,可以查看手册中的列表。常见的设置:@ ini_set('memory_lim

  • nvm安装nodejs 运行use命令时报错exit status 1: ��û���㹻��Ȩ��ִ�д˲�����2022-03-31 10:35:45

              错误提示:exit status 1: ��û���㹻��Ȩ��ִ�д˲����� 换目录重新安装多次都没用 猜测应该是权限问题 遂将cmd以管理员身份运行    ok问题解决  

  • [AWS] IAM Best Practices2022-03-31 03:31:18

    Lock away your AWS account root user access keys Create individual IAM users Use groups to assign permissions to IAM users Grant least privilege Get started using permissions with AWS managed policies Use customer managed policeis instead of inline polici

  • 【动态规划】洛谷P1802 5 倍经验日(01背包问题)2022-03-31 00:33:08

    一个洛谷普及-的题目,也是我刚刚入门学习动态规划的练习题。 下面发一下我的思路和代码题解:   我的思路及伪代码:       我的AC图:       接下来上代码: 1 //动态规划 洛谷P1802 五倍经验日 2 #include<iostream> 3 #include<cmath> 4 using namespace std; 5 struct hum

  • 【Tokio】异步周期任务2022-03-30 09:32:37

    环境 Time 2022-01-11 Rust 1.57.0 Tokio 1.15.0 概念 参考:https://docs.rs/tokio/latest/tokio/time/index.html 示例 interval use std::{io, thread, time::Duration}; use tokio::time::{self, Instant}; #[tokio::main] async fn main() -> io::Result<()> { let

  • [AWS SAP] Architecture Patterns – Compute2022-03-30 03:00:06

    High availability and elastic scalaility for web servers? Use EC2 Auto Scaling and an ALB across Multi AZs   Low-latency connections over UDP to a pool of instances running a gaming application? Use NLB with a UDP listener   Clients need a whitelist stati

  • 分支和循环2022-03-29 16:34:52

    流程控制:   1 <!DOCTYPE html> 2 <html lang="en"> 3 <head> 4 <meta charset="UTF-8"> 5 <title>Title</title> 6 <script> 7 'use strict'; 8 9 var age =

  • About use the Porsche piwis 3 software to find a Porsche car faultrepair guide2022-03-28 00:32:43

    Porsche Piwis Tester III and Xentry VCI are the newest professional testers for Porsche and Mercedes, the most powerful diagnostic and offline programming tool. You will get a full original diagnostic set with latest software. The package will include reg

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