Software System
Software System
As a front-end web developer, these 12 basic commands must be
Software System
Open source project based on Spring Boot+Spring Security+JWT+Vue separation of front and back ends
Software System
Java anonymous inner class and callback function
Software System
PHP quickly realizes parsing of URL without watermark playback address-fast hand
Software Testing
Software Testing

The latest Python basic learning tutorial in 2019: learn crawlers from 0? Let crawlers satisfy your curiosity!

... Hunter
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Software Testing

Which broadcast pre-test training school in Guiyang is good

... Brandon
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Software Testing

Swift brush LeetCode tool method

... Calvin
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Software Testing

[Direct BAT] Sword refers to the offer classic test questions (1)

... Brady
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Software Testing

vue adaptive PC terminal mobile terminal postcss-px-to-viewport

... Max
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Software Testing

Collections tools

... Greyson
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Software tools
Software Tools

Optimization ideas for high-concurrency spike scenarios and implementation of core functions based on redis

Scene analysis Before considering the detailed design, let's take a look at the spike scene and discover some of the characteristics of the scene: System, data scene characteristics 1. Read more and less write: The effective operation in the spike scene is far smaller than the invalid operation, the so-called invalid operation That is, the relevant content in the spike scene was accessed, but there was no operation to facilitate the transaction in the end. 2. The burst of traffic flow in time ha

... Layla
schedule 16 min read
Software Tools

Blockchain technology is applied to the development plan of electronic ticketing system

Statistics from the National Bureau of Statistics show that our annual domestic tourist arrivals and tourism revenue have maintained a growth level of more than 10% each year. The tourism industry has always been a key industry in my country. However, false ticket purchases have been repeatedly banned and even more rampant. Many anti-counterfeiting methods have emerged with the advancement of technology, but there are still many false bills. So, in a world where even US dollars can be forged, ca

... Bryce
schedule 2 min read
Software Tools

Will Google's mysterious new system Fuchsia be the end of Android?

The first news about Google's new system Fuchsia appeared in 2016. So far, nearly two years have passed since then. During the period, everyone has always expected that Google will announce the news of this system that integrates the desktop operating system Chrome OS and the mobile operating system Android. However, after two sessions of Google Developers Conference, apart from some rumors from the private sector, official news about Fuchsia can be said to be very few.Currently, the best Chrome

... Cora
schedule 8 min read
Software Tools

js function execution mechanism

function fn(){ } var f = function qqq(){ } console.dir(f); var f2 = ()=>{ // this arguments } Function in js: function plus function name function Function expression (function expression can also add function name after function inside, but it is meaningless) Self-executing function, no function name, can only be executed once (function () { console.log(this, 1); })(); ! function () { console.log(this, 2); }(); ~ function () { console.log(this, 3); }(); ES6 arrow function The parameters wri

... Jack
schedule 6 min read
Software Tools

CentOS system deployment ShowDoc

This article records how to deploy ShowDoc document management system on CentOS system. We will use Docker for installation. ShowDoc introduction ShowDoc is an online document sharing tool that is very suitable for IT teams. It can speed up the efficiency of communication between teams. What can it be used for API documentation ( see Demo ) With the development of the mobile Internet, BaaS (backend as a service) is becoming more and more popular. The server provides API, and the APP or web front

... Brandon
schedule 3 min read
Software Tools

Let's experiment with functional generators and the pipeline operator in JavaScript

Let's experiment with functional generators and the pipeline operator in JavaScriptCristi Salcescu Blocked Unblock Follow FollowingJan 10Photo by Patrick Hendry on  UnsplashA generator is a function that returns the next value from the sequence each time it is called.Let's start with a simple functional generator that gives the next integer each time is called. It starts from 0.function sequence() { let count = 0; return function() { const result = count; count += 1; return result; }} const

... Serenity
schedule 7 min read
Database Technologies
Database Technologies

Some experience and experience sharing on data visualization design

Speaking of data visualization, it was an emerging niche industry in the past few years. However, with the vigorous development of the big data industry, many companies have gradually discovered the practicality and convenience of data visualization, so data visualization design has gradually become a hot topic. Many of my friends are just getting in touch with data visualization, and feel confused when facing the needs of customers and don't know where to start. So let me share with you my unde

Database Technologies

Analysis of real questions for system architects (4)-database model and paradigm

1 Analysis of the real question Commodity relationship model P (commodity code, product name, supplier, contact information, inventory quantity) of a shopping mall s commodity database, functional dependency set F={commodity code product name, (commodity code, supplier) inventory, Supplier Contact Information}. The commodity relationship model P reaches (7); the relationship model is decomposed into (8) and has the characteristics of lossless connection and can maintain functional dependence. (7

Database Technologies

Detailed explanation of the processing of Json data in JS and the method of parsing JSON data

learning target: Section numberKnowledge pointsClaimThe first section of the array to remove duplicatesArray deduplicationTo understandingThe second section array sortingArray sortTo understandingThe third section json overviewjson overviewgraspThe fourth section json methodjson methodgraspSection 5 json parsingjson parsinggrasp 1. Array de-duplication Array deduplication refers to finding the same elements from the array and deleting the same elements. Ensure that each element in the array is a

Database Technologies

Detailed explanation of the thread pool of JUC

Thread Pool The work done by the thread pool is mainly to control the number of running threads. During processing, tasks are added to the queue , and then these tasks are started after the thread is created. If the number exceeds the maximum number, the excess number of threads will wait in line and wait for other threads to execute When finished, take the task out of the queue to execute it. His main characteristics are: Thread reuse: control the maximum number of concurrency: manage threads.

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