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App Inventor 2 低功耗蓝牙(BLE) 硬件接入、数据通信及IO控制 · App Inventor 2 中文网
...弄错以免烧坏硬件）
一般来说，需要接线的端口有以下4个，无论哪款蓝牙硬件，也无论哪种其他硬件，这4个端口都是基本的存在：VCC（正极）、GND（接地负极）、TX、RX 交叉接线，参考接线如图：
2、串口工具测试
接线完...
Why is IntelliJ 13 IDEA so slow after upgrading from version 12?
...telliJ 13 after upgrading from 12.
What worked for me was editing the idea64.vmoptions in the bin folder and setting the max heap to 8 GB (was 512 MB) and the Max PermGen to at least 1GB (was 300MB).Example below:
-Xms128m
-Xmx8192m
-XX:MaxPermSize=1024m
Upon restart it was much faster.
For Inte...
Get all object attributes in Python? [duplicate]
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4 Answers
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Active
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jQuery access input hidden value
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348
You can access hidden fields' values with val(), just like you can do on any other input elemen...
Javascript regex returning true.. then false.. then true.. etc [duplicate]
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/^[^-_]([a-z0-9-_]{4,20})[^-_]$/gi;
You're using a g (global) RegExp. In JavaScript, global regexen have state: you call them (with exec, test etc.) the first time, you get the first match in a given string. Call them again and you get the ne...
Saving utf-8 texts in json.dumps as UTF8, not as \u escape sequence
...d
{1: '\xd7\x91\xd7\xa8\xd7\x99 \xd7\xa6\xd7\xa7\xd7\x9c\xd7\x94', 2: u'\u05d1\u05e8\u05d9 \u05e6\u05e7\u05dc\u05d4'}
>>> s=json.dumps(d, ensure_ascii=False, encoding='utf8')
>>> s
u'{"1": "\u05d1\u05e8\u05d9 \u05e6\u05e7\u05dc\u05d4", "2": "\u05d1\u05e8\u05d9 \u05e6\u05e7\u05dc\u...
How do I write outputs to the Log in Android?
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edited Nov 14 '17 at 13:32
Mike Vella
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Replacing all non-alphanumeric characters with empty strings
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edited Sep 18 '17 at 17:14
Dave Jarvis
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an...
Is there any difference between “!=” and “” in Oracle Sql?
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4 Answers
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Focus Input Box On Load
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jessegavinjessegavin
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