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App Inventor 2 FTP 上传下载全方案总结 · App Inventor 2 中文网
...收费的:$12，请自行研究）
地址：https://puravidaapps.com/ftp.php
FTPClient （收费的:$5，请自行研究）
地址：https://community.appinventor.mit.edu/t/paid-ftpclient-an-extension-to-communicate-to-remote-server-5-or-inr-350/23519
切...
这个墨绿色的标题栏可以换颜色吗？ - App Inventor 2 中文网 - 清泛IT社区...
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TaifunTools（免费，功能强）：https://puravidaapps.com/tools.php
Device（功能多且复杂）：https://community.appinventor.mit.edu/t/free-device-get-device-info/48411
StatusBarTools（简单易用，推荐）：https://community.appinventor.mit.edu/t/statusbartools-extension-f...
App Inventor 2 列表显示框能否实现多选功能？ - App Inventor 2 中文网 - ...
...现，不过是收费的，12美刀。
https://puravidaapps.com/combobox.php
请教一个有关WEB 客户端 1的问题 - App Inventor 2 中文网 - 清泛IT社区，为创新赋能！
...WEB 客户端 1 通过 URL将参数传输给下图中地址并调用一个PHP文件，但是出现了错误信息“ERROR 1101：unable to get a response with the specified url"
我直接通过浏览器传输，显示结果正确。借助WEB浏览框如下图所示那样，也获得正确结果。
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App Inventor 2 QRCode 扩展：二维码扫描及生成方案都在这里 - App Invento...
1、QRCode 二维码扫码：
使用原生的“条码扫描器”组件：
2、二维码生成的方案：
html + js + Web浏览器 方案：https://puravidaapps.com/qr.php
QRCodeGenerator 拓展方案：https://community.appinventor.mi ... tor-extension/47908
MySQL select 10 random rows from 600K rows fast
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Yes, if you have potentially big gaps in ID's then the chance of your lowest ID's being picked randomly is much lower than your high IDs. In fact the chance that the first ID after the biggest gap getting picked is actually the highest. Therefore th...
How to compare two floating point numbers in Bash?
...true or false.
Please, ensure that the bc basic calculator package is installed.
This equally works for floats in scientific format, provided a capital letter E is employed, e.g. num1=3.44E6
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How do I make a transparent border with CSS?
...t I don't mind safari much. thanks a lot!
– William Calleja
Mar 24 '10 at 10:36
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Yeah, it's spec...
Best data type for storing currency values in a MySQL database
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Something like Decimal(19,4) usually works pretty well in most cases. You can adjust the scale and precision to fit the needs of the numbers you need to store. Even in SQL Server, I tend not to use "money" as it's non-standard.
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How to set up a PostgreSQL database in Django
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You need to install psycopg2 Python library.
Installation
Download http://initd.org/psycopg/, then install it under Python PATH
After downloading, easily extract the tarball and:
$ python setup.py install
Or if you wish, install it b...