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App Inventor 2 UrsPahoMqttClient 拓展 - 物联网轻量级MQTT协议 · App Inventor 2 中文网
...《App Inventor 2 MQTT拓展入门（保姆级教程）》
最新版拓展下载：
de.ullisroboterseite.ursai2pahomqtt.aix
MQTT（Message Queuing Telemetry Transport：消息队列遥测传输）
MQTT 发明于 1999 年，为物联网设计的轻量级协议，基于TCP协议实现。
M...
How to urlencode data for curl command?
... It fails to work for me in Bash 4.3.11(1). The string Jogging «à l'Hèze» generates Jogging%20%abà%20l%27Hèze%bb that cannot be feed to JS decodeURIComponent :(
– dmcontador
Nov 19 '15 at 12:07
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CSS '>' selector; what is it? [duplicate]
...ered Dec 16 '10 at 10:44
David MårtenssonDavid Mårtensson
7,10044 gold badges2727 silver badges4646 bronze badges
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Linking R and Julia?
...red Aug 12 '15 at 17:06
Martin MächlerMartin Mächler
3,8962222 silver badges2424 bronze badges
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On design patterns: When should I use the singleton?
The glorified global variable - becomes a gloried global class. Some say breaking object-oriented design.
19 Answers
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How to change the default charset of a MySQL table?
...this is not changing the default charset. to change the default do as eak said ALTER TABLE tbl CHARACTER SET utf8
– Accountant م
Sep 22 '16 at 20:18
7
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How can I override Bootstrap CSS styles?
...Dec 21 '13 at 17:04
Markus KottländerMarkus Kottländer
7,41033 gold badges3131 silver badges5757 bronze badges
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Equals(=) vs. LIKE
...duce results different from the = comparison operator:
mysql> SELECT 'ä' LIKE 'ae' COLLATE latin1_german2_ci;
+-----------------------------------------+
| 'ä' LIKE 'ae' COLLATE latin1_german2_ci |
+-----------------------------------------+
| 0 |
+------...
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... 各版本对比 App上架指南 入门必读 IoT专题 AI2拓展 Aia Store 关于 关于我们 发布日志 服务条款 搜索 ...
Using awk to remove the Byte-order mark
...t not UTF-16 files without a BOM) to UTF-8 without a BOM:
$ printf '\ufeffä\n'|iconv -f utf-8 -t utf-16be>bom-utf16be
$ printf '\ufeffä\n'|iconv -f utf-8 -t utf-16le>bom-utf16le
$ printf '\ufeffä\n'>bom-utf8
$ printf 'ä\n'|iconv -f utf-8 -t utf-16be>utf16be
$ printf 'ä\n'|iconv -f ...