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AppInventor如何扫二维码？扫码结果如何与Web进行交互？ - App Inventor 2 ...
Q：请问扫二维码怎么实现？
[hide]A：使用“条码扫描器”组件：https://www.fun123.cn/reference/ ... html#BarcodeScanner
属性“使用外部扫描”设置为假，其他没有啥要注意的。就调用一下扫描方法，就能使用摄像头扫...
AppInventor2项目是自动保存的吗？ - App Inventor 2 中文网 - 清泛IT社区，为创新赋能！
Q：AppInventor2项目是自动保存的吗？
先说结论：是的，自动保存。在界面或者代码块发生变化之后，会自动进行项目保存。
当然，如果要追求心里”踏实感“，建议可以手动再保存一次，项目菜单 -> 保存项目：
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UrsPahoMqttClient心跳问题解决——Paho底层已自动处理，设好KeepAlive就行...
问一下心跳PingReq报文怎么发的
目的为保持 MQTT 连接，否则会被踢下线。
用的是什么MQTT扩展？UrsPahoMqttClient。
结论：不需要手动发心跳，Paho底层已内置实现
UrsPahoMqttClient 封装的是 Eclipse Paho MQTT 客户端，心跳（PingReq）...
JPQL IN clause: Java-Arrays (or Lists, Sets…)?
...y number of values from our database. The logical way to go about this in SQL would be to build an "IN" clause. JPQL allows for IN, but it seems to require me to specify every single parameter to IN directly (as in, "in (:in1, :in2, :in3)").
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Hidden features of Perl?
...l -lwe '*4 = sub { print "yes" }; 4->()'
yes
There's also the "bool" quasi operator, that return 1 for true expressions and the empty string for false:
$ perl -wle 'print !!4'
1
$ perl -wle 'print !!"0 but true"'
1
$ perl -wle 'print !!0'
(empty line)
Other interesting stuff: with use overl...
Convert String to Uri
... to its standards. For example, try to parse: http://www.google.com/search?q=cat|dog. An exception will be thrown for the vertical bar.
urllib makes it easy to convert a string to a java.net.URI. It will pre-process and escape the URL.
assertEquals("http://www.google.com/search?q=cat%7Cdog",
...
clear table jquery
...
Slightly quicker than removing each one individually:
$('#myTable').empty()
Technically, this will remove thead, tfoot and tbody elements too.
share
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Check if two linked lists merge. If so, where?
This question may be old, but I couldn't think of an answer.
26 Answers
26
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Declaring pointers; asterisk on the left or right of the space between the type and name? [duplicate
...tter when you have const in play. int const * const p; vs int const* const q; (or perhaps the minimal spaces people would prefer int const*const r;?)
– David Stone
Oct 19 '13 at 2:53
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App Inventor 2 LLMAI2Ext 自研拓展：接入DeepSeek、Kimi、通义千问...等国...
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v2.1
DeepSeek 支持图片识别（视觉）：新增 ChatWithImage / ChatWithImageUrl 方法...