Software System
Software System
Remove the black background of the picture and output it as a transparent background
Software System
A brief explanation of Flutter's Button (basic component)
Software System
[Lifecycle with Jetpack on the back] Everything is based on Lifecycle, obscure and great use
Software System
[Translation] Awesome Flutter: A Flutter guide that takes you from beginner to advanced
Software Testing
Software Testing

Summary of the latest PHP interview and written test questions in 2021 (2)

... Nolan
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Software Testing

Python crawls the backend order interface data of the latest version of CRMEB and saves the data as excel

... Ruby
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Software Testing

Java application monitoring (8)-Alibaba diagnostic tool arthas

... Andrea
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Software Testing

React background basic template construction, including node to implement server side (not involving database)

... Faith
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Software Testing

Today I will share with you a summary of commonly used commands based on the Linux debugging tools strace and gdb

... Ella
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Software Testing

vue-element-template implements permission management, dynamic routing, and dynamic loading of sidebars

... Londyn
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Software tools
Software Tools

Android Glide use puzzle: why your image caching function does not work?

Preface Glide, This function is very powerful Androidimage loading believe we are not familiar open-source framework Because of its powerful functions, its source code is very complicated, which causes many people to stay away. Try to Glidefunction decomposition, and source code analysis separately for each function, thereby reducing the Glidecomplexity of the source code. Next, I will launch a series on Glidefunctional analysis of the source code, are interested can continue to focus on Today,

... Asher
schedule 5 min read
Software Tools

JS function execution timing

When to call the function Every function has its calling time, and the calling time is different, the result will be different naturally. Here are a few general examples: let a = 1 function fn(){ console.log(a) } fn() // 1 // 1 let a = 1 function fn(){ console.log(a) } a = 2 fn() // 2 // 2 2 let a = 1 function fn(){ console.log(a) } fn() a = 2 // 1 // a 2 1 let a = 1 function fn(){ setTimeout(()=>{ console.log(a) },0) } fn() a = 2 // 2 The above code has a setTimeoutfunction, it will set a ti

... Asher
schedule 3 min read
Software Tools

Python condensed notes (5)-functional programming

Functional programming is a programming paradigm with a high degree of abstraction. A function written in a purely functional programming language has no variables. Therefore, for any function, as long as the input is certain, the output is certain. This kind of pure function is called For no side effects. And the programming language that allows the use of variables, because the variable state inside the function is uncertain, the same input may get different outputs, so this kind of function h

... Blake
schedule 7 min read
Software Tools

Some basic theories of distributed systems

Preface A year ago, I did some related summaries of Zookeeper, and now we pick it up again, and re-examine some of the causes and consequences more clearly. Previous link High concurrency from scratch (1) --- The basic concept of Zookeeper High concurrency from scratch (2) --- Zookeeper realizes distributed locks High concurrency from scratch (3) --- Zookeeper cluster construction and leader election High concurrency from scratch (4) --- Zookeeper's distributed queue High concurrency from scratc

... Hannah
schedule 25 min read
Software Tools

Basic git operations, stash temporary storage, stash retrieve, create branch, delete branch, git ignore file failure

git basic operation process git status View this modification, new creation, deletion and other information (new file: new file, modified: modified file, deleted: deleted file) git pull pull code git add. Add all upcoming files git add fileNamePath to add a file git commit-'Submitted log' submitted to the local git push submit to the git server git another way to submit git commit -a -m'Submitted log' Add all the files to be submitted and submit them to the local git commit -a -m is equivalent t

... Weston
schedule 3 min read
Software Tools

Maven project adds sending mail function

Add jar package dependency to maven project <!-- --> <dependency> <groupId>com.sun.mail</groupId> <artifactId>javax.mail</artifactId> <version>${javax.mail.version}</version> </dependency> The version is: Get mail server configuration information: First set up smtp and pop3 services in the mailbox and get the authorization code: mail.properties file: mail.smtp.host=smtp.126.com mail.smtp.username=gloryfung@126.com mail.smtp.password=xxxxx ma

... Hunter
schedule 2 min read
Database Technologies
Database Technologies

docker(1)-basic

Not much to say that docker is a more excellent virtual machine-like system with independent storage space. It has many excellent ideas, such as absorbing the idea of git storage warehouse, and using image to refer to the warehouse in git. Hierarchical storage of docker When Docker was designed, it made full use of the technology of Union FS and designed it as a tiered storage architecture. So strictly speaking, an image is not a packaged file like an ISO. An image is just a virtual concept. Its

Database Technologies

Detailed explanation of this in JS 1 (interview)

what is this? If you have learned object-oriented programming languages (such as C#, Java, C++), please throw your preconceived concepts about what this keyword should be in the trash can. The this keyword of JavaScript is very different. Because JavaScript is not originally a class-based object-oriented programming language. Although JavaScript in ES6 provides us with the class feature for us to use, it is just a syntactic sugar, a syntactic sugar based on prototypal inheritance! ! ! ! this doe

Database Technologies

Detailed explanation of Spark ML numerical types and basic statistical algorithms for data aggregation-Spark commercial ML actual combat

1 Spark ML architecture Spark ML consists of classification, regression, clustering, collaborative filtering, dimensionality reduction, etc. Among them, a pipeline PipeLine can be constructed based on machine learning algorithms. Spark builds a complete set of machine learning algorithm libraries through the machine learning pipeline based on the DataFrames high-level API. 2 feature vectorization Only by converting the original features into feature vectors can it be used for machine learning mo

Database Technologies

What is the experience of being a host at D2?

Some thoughts In 17 years, as an intern, I participated in a D2 as a volunteer in the sign-in group in Xixi Park. When I saw the news of this year s D2 event, with the mentality of getting to know the big guys and saving money on tickets (crossed out), I couldn t help but register again. I was notified on 11.19 and became a volunteer of the host group , I was very worried at the time. As the boss of the host group, Miss Baibatian has done a lot of overall planning work, and she likes it. In orde

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