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Center a position:fixed element
...l not center vertically and won't work in IE6/7. */
left: 0;
right: 0;
Again, this works only in IE8+ if you care about IE, and this centers only horizontally not vertically.
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如何编写一个独立的 PHP 扩展（译） - 更多技术 - 清泛网 - 专注C/C++及内核技术
...是说想要编写 PHP 扩展，你既需要已经安装了 PHP，也需要下载一份 PHP 源码。
定义一个新扩展
我们给示例扩展命名为 “foobar”。
新扩展包含两个资源文件：foo.c 和 bar.c（还有一些头文件，但这些不只重要）。
示例扩展不引...
How to toggle a value in Python
...0
>>> x ^= 1
>>> x
1
The technique generalizes to any pair of integers. The xor-by-one step is replaced with a xor-by-precomputed-constant:
>>> A = 205
>>> B = -117
>>> t = A ^ B # precomputed toggle constant
>>> x = A
>>> x ^...
使用App Inventor扩展实现多点触控：Rotation Detector · App Inventor 2 中文网
... to implement multitouch: Rotation Detector
Xinyue Deng dengxinyue0420@gmail.com
DRAFT (March 6, 2016): Building extensions requires the App Inventor extensions capability, which is not yet incorporated into the App Inventor release. But you can try some ofary AI2 server.
You can implement the...
使用App Inventor扩展实现多点触控：Rotation Detector · App Inventor 2 中文网
... to implement multitouch: Rotation Detector
Xinyue Deng dengxinyue0420@gmail.com
DRAFT (March 6, 2016): Building extensions requires the App Inventor extensions capability, which is not yet incorporated into the App Inventor release. But you can try some ofary AI2 server.
You can implement the...
使用App Inventor扩展实现多点触控：Rotation Detector · App Inventor 2 中文网
... to implement multitouch: Rotation Detector
Xinyue Deng dengxinyue0420@gmail.com
DRAFT (March 6, 2016): Building extensions requires the App Inventor extensions capability, which is not yet incorporated into the App Inventor release. But you can try some ofary AI2 server.
You can implement the...
使用App Inventor扩展实现多点触控：Rotation Detector · App Inventor 2 中文网
... to implement multitouch: Rotation Detector
Xinyue Deng dengxinyue0420@gmail.com
DRAFT (March 6, 2016): Building extensions requires the App Inventor extensions capability, which is not yet incorporated into the App Inventor release. But you can try some ofary AI2 server.
You can implement the...
Heroku NodeJS http to https ssl forced redirect
...u Cedar stack, and ExpressJS ~3.4.4, here is a working set of code.
The main thing to remember here is that we ARE deploying to Heroku. SSL termination happens at the load balancer, before encrypted traffic reaches your node app. It is possible to test whether https was used to make the request wi...
使用 C++ 处理 JSON 数据交换格式 - C/C++ - 清泛网 - 专注C/C++及内核技术
... 是比较出名的 C++ JSON 解析库。在 JSON官网也是首推的。
下载地址为：http://sourceforge.NET/projects/jsoncpp。本文使用的 jsoncpp 版本为：0.5.0。
三、jsoncpp 在 Windows 下的编译
要使用第三方源码库，第一步少不了的就是编译，将源码...
Excel RTD(Excel Real-Time Data)实时刷新数据技术 - C/C++ - 清泛网 - 专注C/C++及内核技术
...收盘价格的基础上加了一个Random来演示实时变化。这个在下载的代码中您可以看到。这里不多讲。定义好这些变量之后我们就可以开始编写代码了。
第一个要实现的方法是 ServerStart方法。在该方法中，我们将CallbackObject对象...