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App Inventor 2 中文网原创内容 · App Inventor 2 中文网
...2”是什么意思？
【科普】App Inventor 2 能编译出苹果iOS版App吗？
【科普】App Inventor 2 添加超过10个屏幕会怎样？
【算法】如何计算1加到100的总和？（经典循环的写法）
【算法】App Inventor 2 算法之二分算法（Binary Search）实...
return query based on date
...after a given date:
db.gpsdatas.find({"createdAt" : { $gte : new ISODate("2012-01-12T20:15:31Z") }});
I'm using $gte (greater than or equals), because this is often used for date-only queries, where the time component is 00:00:00.
If you really want to find a date that equals another date, the s...
大数据：用数据指导APP运营 - 资讯 - 清泛网 - 专注C/C++及内核技术
...性社区平台，其效果几乎也可以无视，而如果换成一款Q版小游戏，或许效果就很好。
成本数据和收益数据，则会从不同层面反映出运营的效果。
在这里插一句，千万不要相信网上流传的各种《XX高管教你不花钱做运营》这种...
Any reason not to use '+' to concatenate two strings?
...passed in as well:
In [1]: from datetime import date
In [2]: zeta = date(2012, 4, 15)
In [3]: print 'bar: ' + zeta
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
/home/izkata/<ipython cons...
Is the Javascript date object always one day off?
...te string as UTC, but then adjusts for timezone. I can even do `new Date('2012-01-02 EDT') and still moves it back to the previous day due to applying the offset for daylight savings, which makes no sense because if I told you that is the date as per the current local timezone of EDT, then don't ap...
Error to use a section registered as allowDefinition='MachineToApplication' beyond application level
...
In Visual Studio 2012 and 2013, when the config file has Copy to Output Directory = Always Copy, the Publish process seems to drop copies of the config file into bin and obj folders, which then triggers this exception. The solution for this ...
RabbitMQ message size and types
...ant to read up on their performance measures:
http://www.rabbitmq.com/blog/2012/04/17/rabbitmq-performance-measurements-part-1/
http://www.rabbitmq.com/blog/2012/04/25/rabbitmq-performance-measurements-part-2/
Queues are pretty light weight, you will most likely be limited by the number of connectio...
How to print a date in a regular format?
... since the epoch: 1349271346.46
Current date and time: 2012-10-03 15:35:46.461491
Or like this: 12-10-03-15-35
Current year: 2012
Month of year: October
Week number of the year: 40
Wee...
Is there any JSON Web Token (JWT) example in C#?
...sed a solution of their own. See http://blogs.msdn.com/b/vbertocci/archive/2012/11/20/introducing-the-developer-preview-of-the-json-web-token-handler-for-the-microsoft-net-framework-4-5.aspx for details.
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Error :Request header field Content-Type is not allowed by Access-Control-Allow-Headers
I created an mvc4 web api project using vS2012. I used following tutorial to solve the Cross-Origin Resource Sharing, "http://blogs.msdn.com/b/carlosfigueira/archive/2012/07/02/cors-support-in-asp-net-web-api-rc-version.aspx". It is working successfully, and i post data from client side to server s...