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RadioButton单选按钮扩展集合 · App Inventor 2 中文网
...oButton组件，但CheckBox的行为与RadioButton非常相似。在Android操作系统中，两个控件都派生自相同的基类（CompoundButton）。此扩展将CheckBox转换为RadioButton。
使用方法
布局设置: 将要转换的CheckBox放置在一个布局...
How to detect online/offline event cross-browser?
...er vendors update the navigator.onLine flag when actual network access is lost, others don't.
From the spec:
Returns false if the user agent is
definitely offline (disconnected from
the network). Returns true if the user
agent might be online.
The events online and offline are
fired when the value ...
Installing Apple's Network Link Conditioner Tool
... Just double-click the Network Link Conditioner.prefpane and OS X will install it for you. (System Preferences will pop up and ask you about it.)
– Kurt Revis
May 11 '12 at 3:52
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What is the difference between SQL, PL-SQL and T-SQL?
...guage to operate on sets.
It is more or less standardized, and used by almost all relational database management systems: SQL Server, Oracle, MySQL, PostgreSQL, DB2, Informix, etc.
PL/SQL is a proprietary procedural language used by Oracle
PL/pgSQL is a procedural language used by PostgreSQL
TSQL i...
Browser detection in JavaScript? [duplicate]
...F 3's issue with not sending the Content-Length header for read-only AJAX POST messages), feature support just doesn't cut it.
– Cobra
Jun 12 '13 at 16:04
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What is the best way to programmatically detect porn images? [closed]
...ones - and porn images tend to have a lot of skin. This will create false positives but if this is a problem you can pass images so detected through actual moderation. This not only greatly reduces the the work for moderators but also gives you lots of free porn. It's win-win.
#!python
import o...
GestureDetect 扩展：手势检测扩展，识别滑动、点击和长按手势 · App Inventor 2 中文网
...stureDetect 是一个免费的手势检测扩展，用于识别各种手势操作。该扩展可以检测上滑、下滑、左滑、右滑、双击、单击和长按手势，为应用提供丰富的交互体验。
包名：aryan.gupta.GesturesDetector
版本：1
发布日期：2020年11月28日
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How to prevent SIGPIPEs (or handle them properly)
...use signal handlers in C have many restrictions on what they can do.
The most portable way to do this is to set the SIGPIPE handler to SIG_IGN. This will prevent any socket or pipe write from causing a SIGPIPE signal.
To ignore the SIGPIPE signal, use the following code:
signal(SIGPIPE, SIG_IGN)...
When do I use the PHP constant “PHP_EOL”?
...
Yes, PHP_EOL is ostensibly used to find the newline character in a cross-platform-compatible way, so it handles DOS/Unix issues.
Note that PHP_EOL represents the endline character for the current system. For instance, it will not find a Win...
Sphinx autodoc is not automatic enough
...
Where are you supposed to output the files to? I tried outputting them to Sphinx's default _build folder, but running sphinx-build -b html . ./_build doesn't pick them up.
– Cerin
Jan 6 '11 at 18:13
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