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将 App Inventor 2 项目连接到外部传感器 · App Inventor 2 中文网
...= new QRCode("qrcode", { text: window.location.href + "?f=share", //URL地址 width: 150, height: 150, colorDark: '#000000', //二维码颜色 colorLight: "#ffffff" //背景颜色}); App Inventor 2 中文网 © 2023 - document.write(new Date().getFullYear()); 跟着...
What is the difference/usage of homebrew, macports or other package installation tools? [closed]
I've just recently switched to a Mac from Ubuntu. I was disappointed that mac doesn't have the convenient sudo apt-get in Ubuntu. I've heard that I should use homebrew but I'm not exactly sure what homebrew or macports does?
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How can I determine what font a browser is actually using to render some text?
...rowsers (and even different versions of a single browser) on the very same machine might use different fonts, due to the font types supported/preferred by a browser. On a Mac, for example, Safari might prefer Apple Advanced Technology while Firefox supports Microsoft OpenType (which might yield prob...
浅谈HTML5 & CSS3的新交互特性 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...给大家一个参考，也希望大家多多支持脚本之家。
原文地址：http://www.cnblogs.com/androidshouce/archive/2016/07/19/5683426.html
HTML5 CSS3 新交互特性
I can’t find the Android keytool
...XP, but I imagine it is similar for other versions of Windows. It appears Mac and Linux users have an easier time with this so I won't address them.
So in order to use mapviews in your Android apps, Google wants to check in with them so you can sign off on an Android Maps APIs Terms Of Service agr...
How to check if a process id (PID) exists
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I can confirm that on macOS Sierra, this works. Also, the -p is unnecessary, at least in that case. ps $PID has the exact same result.
– user137369
Apr 16 '17 at 10:56
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Open new Terminal Tab from command line (Mac OS X)
Is it possible to open a new tab in Mac OS X's terminal from the command line in a currently opened tab?
13 Answers
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How do I programmatically determine operating system in Java?
...OperatingSystemType();
switch (ostype) {
case Windows: break;
case MacOS: break;
case Linux: break;
case Other: break;
}
The helper class is:
/**
* helper class to check the operating system this Java VM runs in
*
* please keep the notes below as a pseudo-license
*
* http://s...
Can't find the 'libpq-fe.h header when trying to install pg gem
...ibpq-dev
On Red Hat Linux (RHEL) systems: yum install postgresql-devel
For Mac Homebrew: brew install postgresql
For Mac MacPorts PostgreSQL: gem install pg -- --with-pg-config=/opt/local/lib/postgresql[version number]/bin/pg_config
For OpenSuse: zypper in postgresql-devel
For ArchLinux: pacman -S p...
CSS3 gradient background set on body doesn't stretch but instead repeats?
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This worked for me in every browser I tested (Chrome [Mac], Safari [Mac], Firefox [Mac/Win7], IE9 [Win7] and Opera [Mac]) without the scrollbar side effect of the "height: 100%" solution. Thanks!
– pipwerks
May 9 '11 at 17:11
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