Common design patterns in java

Recently I want to study design patterns, but there are quite a few design patterns. I would like to ask what are the commonly used design patterns?

仅有的幸福 2017-05-27 17:41:16 0  8  931

javascript - js variable scope problem

I have a question when studying the modular writing method of js. The code is as follows {code...} I want to know why module1.m2() cannot access count?

代言 2017-06-12 09:28:08 0  2  729

How to get parent_id name of category table from post table

I have the following table in the "Category" table. id name parent_id1 student empty 2 teacher empty 3 math student 14 science student 1 I have the following table in the "Release" table. Post.php file in id name category_id1 Ajay 32 Mohan 3 model publicfunctioncategory(){return$...

P粉936568533 2023-09-12 22:21:06 0  2  596

Error: Required module that throws exception: Invariant violation: 'background' 'background' is not a valid style attribute

I'm implementing ZEGCLOUD one to one voice calling. I encountered this error. Error: Requires module 'node_modules@zegocloud\zego-uikit-prebuilt-call-rn\lib\commonjs\index.js', throwing exception: Invariant violation: 'background' is not a valid style attribute. CallScreen code. What am I doing wron...

P粉245489391 2024-02-17 16:25:47 0  1  444

How to display the collected data in real time on the page?

The data is collected from the terminal and sent to the Internet through the communication module. The data needs to be downloaded from the Internet and displayed on the web page in real time. What knowledge do I need to learn? Are there any learning routes, learning methods, books, etc. that you wo...

黄小金 2018-03-23 16:20:15 0  2  2665

javascript - Questions about the order in which promise instances are executed?

Recently, because I wanted to make a small program, I studied js. I used to work on the server side. The login part of the small program was more complicated. Later, the callbacks were nested too deeply, so I kept learning. Later, I discovered promises, but I encountered the problem when making prom...

伊谢尔伦 2017-05-19 10:47:45 0  1  895

php - Using http's Last-Modified cache to read cached files?

Recently, I have studied the Last-Modified caching mechanism of http, which allows the browser to read the cache file, $num = 4; //Simulate server data changes and determine whether the browser needs to read the cache file if($num==4 ) { {code...} }else{ {code...} } I tested the above and it can be ...

天蓬老师 2017-05-16 13:14:43 0  1  661

Style MediaWiki internal links based on the page's last revision date.

I have a huge Wikipedia with lots of pages, many of them out of date. I want to apply custom CSS styles to each link based on the age of the page. I've been looking into the source code of MediaWiki and for each link I can get the DB key from the LinkTarget. Please view the source code here. I'm loo...

P粉184747536 2023-07-20 10:47:09 0  1  460

swoole is perfectly adapted to thinkphp5. If you need it, you can refer to it and learn to advance to intermediate and advanced levels.

The following is the code after successful debugging and configuration. To facilitate everyone's learning and save everyone's research time, it is shared here. 1. Enable httpServer request You can create a server directory in the thinkphp directory and create an http_server.php in it 2. Do a few thi...

momo 2018-12-10 11:41:34 0  1  1364

How to make Button styles global throughout the project using both tailwind and Angular

I'm a beginner and I've been looking into Angular and decided to use Tailwind for styling, since every Tailwind class is inline, the style class for a button becomes huge and in order to use that button I have to use that class everywhere . This makes the code look cumbersome and maintenance becomes...

P粉428986744 2024-03-29 20:26:57 0  1  348

Survey: Leave a message about the course you most want to learn!

PHP Chinese website premium course channel was officially launched in May this year! At present, many technical experts with many years of practical experience have joined us and become our cooperative lecturers! We plan to launch a batch of excellent quality courses in 2023! This post is a course s...

z老师 2022-12-05 11:59:51 0  21  10807

Select a routing model and store routing data

I'm trying to do something like a comprehensive system of automated activities. The program should have many modules. I plan to organize them according to windows principles. If desired, you can open a new module which you can then close, or open a new module without closing it and return later. For...

P粉949267121 2023-09-14 11:22:24 0  1  669

Content overflow in window prevents scrolling and hides new content

I'm currently building a roulette system program (this is more to stop me from placing bets than placing bets!) and I'm just doing the basic framework, but already have an issue with the main window "#results" not scrolling full of result. The scrolling needs to follow the latest row of co...

P粉106715703 2024-04-03 21:24:55 0  1  439

In SQL templates, Airflow's XCom returns values ​​as double quoted strings while Snowflake uses single quoted strings in SQL queries

I'm new to ETL and working on airflow and snowflakes. I use a python operator to get the maximum created value from a mysql table and based on the xcom of that operator I create a csv file of snowflake data to dump only the latest created data from mysql to snowflake. The problem is when I extract t...

P粉043470158 2024-02-25 15:36:12 0  1  472

Getting emulator errors

I've been trying to reverse engineer a GBA emulator (https://gba.44670.org/) that I found online and using an HTML extractor to try to replicate it. I wanted it to work offline, so I downloaded all the scripts to my computer and ran them there. However, after this, the "Select File" button...

P粉447495069 2023-09-01 20:53:31 0  1  835

Pass form with multiple ids and select to PHP using AJAX

I'm trying to collect selected checkboxes, update or delete them and pass this form to php via ajax. I'm very new to this and have spent a few days trying to figure out a way. Web research didn't give me any results, I tried sending ajax a few different ways - no results. Although using only PHP, I ...

P粉729198207 2024-02-26 14:17:13 0  1  480