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App Inventor 2 低功耗蓝牙 BlueToothLE 拓展 · App Inventor 2 中文网
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最新版拓展下载：
edu.mit.appinventor.ble-20230728.aix
低功耗蓝牙，也称为蓝牙LE 或简称 BLE，是一种类似于经典蓝牙的新通信协议，不同之处在于它旨在消耗更少的功耗和成本，同时保持同...
构建高并发高可用的电商平台架构实践 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...务组件时，需要考虑消息一致性、持久化、可用性、以及完善的监控体系。
业界开源的消息中间件主要RabbitMQ、kafka有两种，
RabbitMQ,遵循AMQP协议，由内在高并发的erlanng语言开发；kafka是Linkedin于2010年12月份开源的消息发布订阅...
What are JavaScript's builtin strings?
...that piece of code just for fun in order to send it to my wife on February 14 :) Having only Chrome installed on the laptop I had no options to check how it works in Firefox and IE. Moreover, I haven't really expected that toString() representation of build-in methods might look differently in other...
Fastest way to determine if an integer's square root is an integer
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Regular expression that matches valid IPv6 addresses
...section 2.2 of rfc5952)
link-local IPv6 addresses with zone index (section 11 of rfc4007)
IPv4-Embedded IPv6 Address (section 2 of rfc6052)
IPv4-mapped IPv6 addresses (section 2.1 of rfc2765)
IPv4-translated addresses (section 2.1 of rfc2765)
IPv6 Regular Expression:
(([0-9a-fA-F]{1,4}:){7,7}[0-...
User recognition without cookies or local storage
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12 Answers
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Find unique rows in numpy.array
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122
As of NumPy 1.13, one can simply choose the axis for selection of unique values in any N-dim a...
How to convert numbers between hexadecimal and decimal
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17 Answers
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List of lists changes reflected across sublists unexpectedly
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14 Answers
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Finding all possible combinations of numbers to reach a given sum
... range(len(numbers)):
n = numbers[i]
remaining = numbers[i+1:]
subset_sum(remaining, target, partial + [n])
if __name__ == "__main__":
subset_sum([3,9,8,4,5,7,10],15)
#Outputs:
#sum([3, 8, 4])=15
#sum([3, 5, 7])=15
#sum([8, 7])=15
#sum([5, 10])=15
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