Articles
android

Vue common problems-analysis from the perspective of source code

Preface I'm going to write a collection of 100 questions about Vue. Just kidding, I don't know how many there will be. I will add it when I see it, and it will continue to be updated... 1 How does Vue monitor the changes of the array? Answer: Let s start with a simple example <template> < div id = "app" > < ul > < li v-for = "(item, i) in list" :key = "i" > {{ item }} </ li > </ ul > < h1 @ click = "add" > add </ h1 > </ div > </template&g

... Emily
schedule 23 min read
android

Computer Design does not want to write XX management system, what GitHub open source projects can learn from?

Today, the blogger recommends several projects. The graduation project (or used to practice hand learning) can learn from the following GitHub projects. I am not simply recommending projects, but I will also give some ideas based on these GitHub projects. , At least one project experience can be added, isn t it? In addition to some GitHub projects, Laoguan also recommends some channels, from which you can also get some actual projects and source code. GitHub project recommendation The recommende

... Grayson
schedule 16 min read
android

no xdkj_lic in java.library.path

org.springframework.web.util.NestedServletException: Handler dispatch failed; nested exception is java.lang.UnsatisfiedLinkError: no xdkj_lic in java.library.path at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:982) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:901) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970) at org.springframework.web.servlet.FrameworkServlet.doGet (F

... Ruby
schedule 2 min read
android

Operation Manual: Principles of DWR

Total documentation: article directory Github: github.com/black-ant I. Introduction DWR is a tool that can be used for front-end and back-end interaction. Its essence is a long connection. It has the following main functions: Front-end JS directly calls back-end methods The back-end code runs the front-end JS directly The DWR tool is a relatively historical tool. In clusters or other special environments, it has great limitations. Relatively speaking, there are actually many more suitable solut

... Makayla
schedule 13 min read
android

Talking about the front-end | How CSS makes the page more beautiful

This is the 28th day that I participated in the Wenwen Challenge. For details of the event, please check: Wenwen Challenge Search for [Program Yuan Xiaozhuang] on the WeChat public account, receive a full set of python full-stack tutorials, as well as the constantly updated e-books and interview materials compiled by Xiaozhuang, waiting for you to get it~ Preface HTML is the skeleton of a web page. Once the shelf is set up, you need to add decoration to the shelf. CSS is to add styles to HTML to

... Max
schedule 27 min read
coder_life

How to configure MongoDB replica set on Ubuntu 20.04

An early version of this tutorial was written by Justin Ellingwood . Introduction MongoDB , also known as _Mongo_, is a document-oriented database used in many modern web applications. It is classified as a NoSQL database because it does not rely on the traditional table-based relational database structure. Instead, it uses a JSON-like document with a dynamic mode. This means that unlike relational databases, MongoDB does not require a predefined schema before adding data to the database. When u

... Kaiden
schedule 25 min read
coder_life

How to play RTSP or RTMP stream in IE browser

Many developers have been troubled by how to build low-latency RTSP or RTMP playback in the IE browser environment. For RTSP streaming, many companies usually convert RTSP to RTMP, and then distribute it to the RTMP server, and then the server to http -flv comes out, the browser directly plays the http-flv stream, or directly plays the RTMP stream through the flash control, and that is, the hls stream is converted, the disadvantage is that the hls stream has a greater delay. The above solution i

... Greyson
schedule 13 min read
coder_life

Essential for the interview! TCP protocol classic fifteen consecutive questions!

Preface The TCP protocol is a must-question knowledge point in interviews with major companies. I have compiled 15 very classic TCP interview questions. I hope everyone finds the ideal offer. Public account : The little boy picking up snails github address , thanks for every star 1. Talk about the TCP three-way handshake process At the beginning, both the client and server are in the CLOSED state, and then the server starts to monitor a certain port and enters the LISTEN state The first handshak

... Kaden
schedule 26 min read
coder_life

424.LeetCode

The best time to buy and sell stocks Method 1: Violence var maxProfit = function(prices) { let maxprofit = 0; for(let i = 0;i <prices.length-1;i++){ for(let j = i+1;j<prices.length;j++){ let profit = prices[j]-prices[i]; if(profit> maxprofit){ maxprofit=profit; } } } return maxprofit }; Copy code Complexity analysis time complexity:O(n2)O(n^2)O ( n2 ). Cyclic operationn(n 1)2\dfrac{n (n-1)}{2}2n ( n 1 ) Times. Space complexity:O(1)O(1)O ( 1 ) . Only constant variables are used. Method 2

... Blake
schedule 8 min read
coder_life

Super detailed illustration! [MySQL advanced articles] stored procedures, views, indexes, functions, triggers

@ TOC 1.1 Download the Linux installation package Download link : dev.mysql.com/downloads/m... 1.2 Install MySQL APACHE 1 ). Uninstall the pre-installed mysql in centos rpm -qa | grep -i mysql rpm -e mysql-libs -5.1 .71 -1. el6.x86_64 --nodeps 2 ). Upload the mysql installation package alt + p -------> put E:/test/MySQL -5.6 .22 -1. el6.i686.rpm-bundle.tar 3 ). Unzip the mysql installation package mkdir mysql tar -xvf MySQL -5.6 .22 -1. el6.i686.rpm-bundle.tar -C /root/mysql 4 ). Install depe

... Jayla
schedule 29 min read
dev_tools

Baidu Brain's new product recommendation in March: a new release of EasyDL video target tracking

After continuous technological optimization and precipitation, Baidu Brain AI open platform has become an important technical support on the road to enterprise intelligence upgrade, and Baidu Smart Cloud empowers all walks of life to realize industrial intelligence. This month, the EasyDL OCR self-training platform is fully open, with built-in Baidu's leading OCR pre-training model, which can quickly complete data annotation and generate virtual data in batches, greatly expand the training set,

... Jackson
schedule 13 min read
dev_tools

Jenkins+docker+gogs front-end automated deployment

jenkins+docker+gogs, initial test, some basic operations, processes, realize git push to automatically package file upload server, restart docker. Docker install Jenkins To use Jenkins mirroring, you only need to change the port or not change jenkins-zh (Chinese) docker run -d --restart=unless-stopped --name jenkins_954L -u root \ -v $(which docker):/usr/bin/docker \ -v /var/run/docker.sock:/var/run/docker.sock \ -v /usr/local/dockerinfo/jenkins:/var/jenkins_home \ -p 60000:60000 -p 50000:50000

... Steven
schedule 3 min read
dev_tools

R language stepwise multiple regression model to analyze the factors affecting the density of Proboscis

Original link: tecdat.cn/?p=9564 Original source: Tuoduan Data Tribe Official Account   table of Contents How to do multiple regression Stepwise regression selection model Step-by-step procedure Define the final model  variance analysis Predicted value graph Check the model's assumptions Model fit standard Compare the model with the likelihood ratio test I extracted some data from the Maryland Bioflow Survey for multiple regression analysis. The data dependent variable is the number of

... Bennett
schedule 9 min read
dev_tools

Understanding of dynamic programming and ideas for problem-solving

Most of the problems of dynamic programming are based on an array. At this time, the state transition is actually the transition from the previous element to the next element. For some questions that do not display an array, you can construct the array yourself (such as integer splitting questions, construct an array from 1 to n yourself). How is the state transition equation listed? Don't worry about this! Generally speaking, the state value of the first N elements is used to obtain the state v

... Colton
schedule 16 min read
dev_tools

Write a compiler from scratch with PHP (2)

The previous link: Write a compiler from scratch with PHP (1) As we mentioned in the previous section, we converted the string into a Token array and stored it in ListLexer. So, what does this Token look like? /* * This file is part of the ByteFerry/Rql-Parser package. * * (c) BardoQi <67158925 @qq .com> * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ declare (strict_types = 1 ); namespace ByteFerry \ RqlPars

... Brandon
schedule 9 min read
programming

"SVG Animation Development Actual Combat"-Chapter 5- SVG Stroke Animation (Stroke)

Demo View online version Polygon's PlayStation 4 Review vivus.js-svg animation principle To achieve the cool stroke animation above, we first need to understand the three related attributes of the stroke animation in SVG: stroke,stroke-dasharray,stroke-dashoffset. These three properties are used as appearance and display properties, and all of them can be used as CSS properties. stroke The stroke attribute in SVG is used to control the way of drawing strokes. We can also use CSS to control the s

... Dominic
schedule 9 min read
programming

Reproduce the classic: "Statistical Learning Methods" Chapter 3 k Nearest Neighbor Method

This article is a code reproduction of the book "Statistical Learning Methods" [1] by Teacher Li Hang. Author: Huang Haiguang[2] Note: The code can be downloaded in github[3]. I will publish the code one after another on the public account "Machine Learning Beginners", so stay tuned. Code directory Chapter 1 Introduction to Statistical Learning Methods Chapter 2 Perceptron Chapter 3 k Nearest Neighbor Method Chapter 4 Naive Bayes Chapter 5 Decision Tree Chapter 6 Logistic Regression Chapter 7 S

... Mackenzie
schedule 17 min read
programming

In-depth understanding of data talents | China Data Talents White Paper

As a popular position for job hunting, what kind of talents do data workers need? How can they measure whether they meet the recruitment requirements? Now let's take a closer look at the data workers. \ Data talent The world's most valuable resource is no longer oil, but data.\ Data is a resource! The scarcity and importance of data workers have gradually been highlighted. How to make data workers become more competitive data talents and maximize their personal value in their work so as to achie

... Lincoln
schedule 14 min read
programming

My serverless combat-leading the next decade of cloud computing

Foreword : Nowadays, more and more large-scale enterprises are beginning to use Serverless on a large scale. Most of the developers in the process of change have turned from the wait-and-see state to the trial stage, and more and more Serverless landing scenarios have been unlocked. As the foundation for basic research and development, more and more companies are beginning to accept serverless and apply it in business practice. It is expected that the Serverless architecture will lead the next

... Layla
schedule 15 min read
programming

A Git memo guide for the front end of 4 years of work

When I just graduated, I used SVN for a very short time, and I have been using Git for version control of the code. For almost 4 years, I made some records and experiences in the process of using Git. Share with you here, you may be able to absorb some useful things from it. Whether it is github, gitlab, or other code hosting platforms, code management is done with git. Git can be said to be a necessary skill for a programmer, which is very helpful for work and interviews. Git commonly used comm

... Bradley
schedule 18 min read
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