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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
...成更多的交互，例如绘制图形、放大缩小，等等。图例是一个用HTML5制作的小游戏。
5. 地理(Geolocation) API
HTML5提供了地理信息的应用接口 Geolocation API。通过这个API，网页可以通过IP，GPS等方式来获得用户的地理信息；同时用户...
Java current machine name and logged in user?
Is it possible to get the name of the currently logged in user (Windows/Unix) and the hostname of the machine?
4 Answers
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psql: could not connect to server: No such file or directory (Mac OS X)
Upon restarting my Mac I got the dreaded Postgres error:
21 Answers
21
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\r\n, \r and \n what is the difference between them? [duplicate]
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\r = CR (Carriage Return) → Used as a new line character in Mac OS before X
\n = LF (Line Feed) → Used as a new line character in Unix/Mac OS X
\r\n = CR + LF → Used as a new line character in Windows
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我帮儿子用App Inventor 2给遥控车装了"蓝牙大脑"，手机一划车就...
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技术方案
硬件端
- 遥控车原有电路不动，额外并联一个HC-05蓝牙模块
- HC-05的TX/RX接Arduino Nano的RX/TX（注意交叉）
- Arduino读取蓝牙数据后，通过MOS管驱动原有遥控车的电机控制信号
软件端（App Inventor 2）
核心组件清单...
Android: android.content.res.Resources$NotFoundException: String resource ID #0x5
... be,
incercari.setText(valIncercari+"");
Or
incercari.setText(Integer.toString(valIncercari));
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How to monitor the memory usage of Node.js?
.... Here is an example from in Node v0.12.2 on a 64-bit system:
$ node --expose-gc
> process.memoryUsage(); // Initial usage
{ rss: 19853312, heapTotal: 9751808, heapUsed: 4535648 }
> gc(); // Force a GC for the baseline.
undefined
> process.memoryUsage(); // Baseline mem...
How can I start PostgreSQL server on Mac OS X?
...nchctl plists to start automatically. For more information, run brew info postgres.
Start manually
pg_ctl -D /usr/local/var/postgres start
Stop manually
pg_ctl -D /usr/local/var/postgres stop
Start automatically
"To have launchd start postgresql now and restart at login:"
brew services start postgre...
Open multiple Eclipse workspaces on the Mac
... be the officially supported way to do this as of 10.5. Earlier version of OS X and even 10.5 and up should still work using the following instructions though.
Open the command line (Terminal)
Navigate to your Eclipse installation folder, for instance:
cd /Applications/eclipse/
cd /Developer/...
Mercurial for Beginners: The Definitive Practical Guide
...s configured in a normal text file called .hgignore in the root of your repository. Add it just like a normal file with:
hg add .hgignore
There are two syntax options available for file matching, glob and regexp. glob is unix-like filename expansion and regexp is regular expressions. You activate...