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Detecting 'stealth' web-crawlers

...nja|InternetSeer\.com|Iria|Irvine|JBH*agent|JetCar|JOC|JOC\ Web\ Spider|JustView|KWebGet|Lachesis|larbin|LeechFTP|LexiBot|lftp|libwww|likse|Link|Link*Sleuth|LINKS\ ARoMATIZED|LinkWalker|LWP|lwp-trivial|Mag-Net|Magnet|Mac\ Finder|Mag-Net|Mass\ Downloader|MCspider|Memo|Microsoft.URL|MIDown\ tool|Mirro...
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Regular expression to match DNS hostname or IP Address?

...|SO|SR|ST|SU|SV|SY|SZ|TC|TD|TEL|TF|TG|TH|TJ|TK|TL|TM|TN|TO|TP|TR|TRAVEL|TT|TV|TW|TZ|UA|UG|UK|US|UY|UZ|VA|VC|VE|VG|VI|VN|VU|WF|WS|XN|XN|XN|XN|XN|XN|XN|XN|XN|XN|XN|YE|YT|YU|ZA|ZM|ZW)[.]?$/i'; if (preg_match, $pattern, $matching_string){ ... do stuff } You may also want to add an if stat...
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Difference between document.addEventListener and window.addEventListener?

... If you will add addEventListener("keydown", event) via window for Samsung TV, than it won't work. But you will do the same thing with document, then it will. Depends also on specific device how it calls bubbled events. – Jakub Kubista Jan 20 at 11:17 ...
https://www.fun123.cn/reference/other/vr.html 

使用虚拟现实和App Inventor进行实验 · App Inventor 2 中文网

...,刚刚发布的 Android 系统 7 (Nougat) 包含 Google 的 Daydream VR 软件,这应该可以简化实现此类演示的任务。 虚拟现实演示应用程序 注意:在 App Inventor 中使用 Cardboard(包括试用这些演示)需要运行 Android 系统 4.3 或更高本的设备...
https://bbs.tsingfun.com/thread-3102-1-1.html 

App Inventor 2 数学积木的9个隐藏用法:随机种子、位运算、取整陷阱,踩中...

...进制,输出 "FF"。做颜色选择器、编码工具、教学软件时特别好用。 技巧9:三角函数全部用角度,不用弧度 和很多编程语言不同,App Inventor 2 的 sin、cos、tan 直接接收角度值(度数),不需要先转弧度。sin(30) 直接...
https://bbs.tsingfun.com/thread-2981-1-1.html 

ESP8285接入App Inventor 2深度调研:4种连接方案+是否需要开发拓展 - 创客...

...SPI, I2C, PWM, ADC相同封装QFN32 (5x5mm)更大 核心结论:ESP8285软件生态与ESP8266 100%兼容,可用Arduino ESP8266 Core或ESP-IDF直接开发。 二、源码层面的现有连接组件 通过分析MIT App Inventor源码(appinventor/components/src/)和fun123自研拓展(cn/fun...
https://www.tsingfun.com/ilife/tech/270.html 

奇葩职位为何频现互联网? - 资讯 - 清泛网 - 专注C/C++及内核技术

...访时表示,目前各行业确实进入口碑竞争时代,随着社交软件发展,消费者与消费者间的沟通更顺畅,每个消费者的个人意见在社交圈里的影响力越来越大。可能企业通过一些改进措施在很多方面提高监管能力,但唯独消息群体...
https://www.tsingfun.com/it/tech/2072.html 

PDB文件:每个开发人员都必须知道的 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...PDB文件 大部分的开发人员应该都知道PDB文件是用来帮助软件的调试的。但是他究竟是如何工作的呢,我们可能并不熟悉。本文描述了PDB文件的存储和内容。同时还描 述了debugger如何找到binay相应的PDB文件,以及debugger如何找到与...
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What's the algorithm to calculate aspect ratio?

...tter-boxing lines (like the ones you get at the top and bottom of your old TV when you're watching a wide-screen movie on it). I'd add them at the top/bottom or the sides (whichever one results in the least number of letter-boxing lines) until the image meets the requirements. One thing you may wan...
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Simple state machine example in C#?

...nd); ProcessState nextState; if (!transitions.TryGetValue(transition, out nextState)) throw new Exception("Invalid transition: " + CurrentState + " -> " + command); return nextState; } public ProcessState MoveNext(Command comman...