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Run cron job only if it isn't already running

... This wheel was already invented somewhere else :) E.g., serverfault.com/a/82863/108394 – Filipe Correia Jun 8 '13 at 2:27 ...
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How to show first commit by 'git log'?

...it does the same, and is simpler; though that option had not quite been “invented” at the time of this question/answer. – Chris Johnsen Jan 10 '13 at 2:28 ...
https://bbs.tsingfun.com/thread-1934-1-1.html 

为AppInventor2开发自己的拓展(Extension) - App Inventor 2 拓展 - 清泛IT社区,为创新赋能!

来源中文网文档:https://www.fun123.cn/reference/extensions/aix_dev.html 为什么需要开发拓展?App Inventor 2 是积木式在线安卓开发环境,利用拖拽式的方式实现代码块堆叠,从而完成相应的逻辑。上手很容易,但是由于代码块提供的功能...
https://bbs.tsingfun.com/thread-1444-1-1.html 

【AI2+AI】人工智能舞姿识别App - 创客硬件开发 - 清泛IT社区,为创新赋能!

...人创造了未开发的机会,让他们学习、联系并改变我们的社区。这就是为什么麻省理工学院和YR媒体联手推出了青年移动动力系列。YR青少年制作故事,突出年轻人如何以令人惊讶和强大的方式使用手机。与此同时,麻省理工学...
https://bbs.tsingfun.com/thread-1527-1-1.html 

Error 908: Permission RECEIVE_SMS has been denied. - App Inventor 2 中...

这篇帖子是关于在MIT App Inventor中遇到错误908(权限接收短信)的讨论。一位用户遇到了这个问题,并询问是否有人知道如何解决。其他用户提供了一些可能的解决方案,包括检查应用程序权限设置、确保手机上的权限设置正确...
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How do I add a delay in a JavaScript loop?

...olution. It is nice to use all existing control structures and not need to invent continuations. – Gus Dec 14 '19 at 22:08 ...
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Can we omit parentheses when creating an object using the “new” operator?

...loper.mozilla.org/en-US/docs/Web/JavaScript/Guide/… , from "the guys who invented the <expletive> language" don't use any parentheses on new Class for parameterless constructors. If this doesn't spell 'opinionated', I don't know what does... – ack Mar 2...
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Parsing CSV files in C#, with header

...Check out FileHelpers and stay DRY - Don't Repeat Yourself - no need to re-invent the wheel a gazillionth time.... You basically just need to define that shape of your data - the fields in your individual line in the CSV - by means of a public class (and so well-thought out attributes like default ...
https://bbs.tsingfun.com/thread-1872-1-1.html 

MQTT与TCP的区别 - 创客硬件开发 - 清泛IT社区,为创新赋能!

一、MQTT与TCP的区别诞生时间TCP协议诞生于1974年冷战期间。MQTT诞生于1999年互联网初期,TCP协议比MQTT协议诞生早了25年。Ashton提出IoT概念也是在1999年,因此MQTT协议生逢其时。当时MIT Auto-ID Labs的Kevin Ashton为了把宝洁的供应链上的RF...
https://bbs.tsingfun.com/thread-616-1-1.html 

如何获取IE (控件)的所有链接(包括Frameset, iframe) - 其他 - 清泛IT社...

来源:新浪博客 IE 顶层 body 节点通过IHTMLElement->get_all 方法无法获取iframe 里面的节点列表: CComPtr<IHTMLElement> body; ... CComPtr<IDispatch> spDispCollection; body->get_all(&spDispCollection);复制代码所以要获取iframe/frame(frameset) ...