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按键可见性的延时设置 - App Inventor 2 中文网 - 清泛IT社区，为创新赋能！
...在里面把按钮的可见性设置为“真”即可。
手机APP上面有好几组按键 控制定时时间， 每按下一个按键启动一个定时时间，(定时时间结束，其他定时按键可见性变真 ), 因使用按键的不确定性（没有先后顺序）怎么分别控制按...
【转】App Inventor 2 项目中批量添加或删除文件 - App应用开发 - 清泛IT社...
对原有的aia文件需要删除6张图片，还有18张图片需要上传。
下图“Media”中显示的图片是需要删除的：
下图中的18个文件是需要上传的：
如果在App Inventor里操作，需要一个个删除，一个个上传，非常浪费时间...
.NET HttpClient. How to POST string value?
...readonly HttpClient _client = new HttpClient(); instead aspnetmonsters.com/2016/08/2016-08-27-httpclientwrong
– Sameer Alibhai
May 9 '17 at 15:05
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PostgreSQL: Difference between text and varchar (character varying)
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UPDATING BENCHMARKS FOR 2016 (pg9.5+)
And using "pure SQL" benchmarks (without any external script)
use any string_generator with UTF8
main benchmarks:
2.1. INSERT
2.2. SELECT comparing and counting
CREATE FUNCTION string_generator(int DEFA...
Difference in months between two dates
...spec should be: new { From = new DateTime(2015, 12, 31), To = new DateTime(2016, 06, 30), Result = 6 }. The "bug" lies in the to.Day < from.Day code which doesn't take into account that months can end in a different "day of the month". In this case from December 31st 2015, until June 30 2016, 6 c...
When to use CouchDB over MongoDB and vice versa
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Update 2016 : Since version 2.0 released in september 2016, CouchDb is supporting ad-hoc queries out-of-the-box :)
– tobiak777
Oct 22 '16 at 12:45
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NodeJS - Error installing with NPM
...//github.com/nodejs/node-gyp/issues/629#issuecomment-153196245
UPDATED 02/2016
Some npm plugins need node-gyp to be installed.
However, node-gyp has it's own dependencies (from the github page):
UPDATED 09/2016
If you're using Windows you can now install all node-gyp dependencies with single ...
App Inventor 2 拓展参考文档 · App Inventor 2 中文网
...动其他应用程序的强大工具
【闹钟】Alarm 闹钟扩展：在指定时间启动App的强大工具
【通知】Notifier 通知扩展：功能强大的Android通知管理工具
【媒体通知】MediaNotification 媒体通知扩展：管理媒体播放器通知，支持播放控制
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git rebase without changing commit timestamps
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The accepted answer didn't work in 2016, but @speakman's answer did!
– Theodore R. Smith
Jun 21 '16 at 22:22
2
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How can I tell PyCharm what type a parameter is expected to be?
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I'm using PyCharm Professional 2016.1 writing py2.6-2.7 code, and I found that using reStructuredText I can express types in a more succint way:
class Replicant(object):
pass
class Hunter(object):
def retire(self, replicant):
""" Retire ...