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App Inventor 2 低功耗蓝牙 BlueToothLE 拓展 · App Inventor 2 中文网
...和广播
扫描
详细接入步骤：
开始扫描 -> 获取BLE设备列表 -> 连接指定设备（也可指定MAC地址连接）-> 设备指定服务uuid和特征uuid 发送 / 接收 数据。
广播
现在常规便宜芯片并无蓝牙协议栈，只能通过人工拼包用最简单的...
Limit the length of a string with AngularJS
... the "...". The result should be: "My String..."
– Snæbjørn
Sep 2 '14 at 13:37
I'm not seeing the ellipsis here: pln...
Can I use a function for a default value in MySql?
... Nov 6 '08 at 21:24
Thibaut BarrèreThibaut Barrère
8,38322 gold badges1919 silver badges2727 bronze badges
...
Spring get current ApplicationContext
... edited Oct 6 '17 at 10:39
buræquete
12.5k44 gold badges3131 silver badges6262 bronze badges
answered Sep 19 '16 at 13:59
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通信连接组件 · App Inventor 2 中文网
...
Extras
返回将作为额外数据传递给Activity活动的键值对列表。
结果
返回Activity活动的结果。
结果名称
指定一个名称，用于从Activity活动中获取结果。
结果类型
从Activity活动中返回的结果 MIME 类型。
结果URI地址
从A...
Approximate cost to access various caches and main memory?
...0 ns (16µs) SSD random read (olibre's note: should be less)
500 000 ns (½ms) Round trip in datacenter
2 000 000 ns (2ms) HDD random read (seek)
See also other sources
What every programmer should know about memory from Ulrich Drepper (2007)
Old but still an excellent deep explanation abou...
制作列表 · App Inventor 2 中文网
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制作列表
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什么是列表？
很多应用程序需要使用数据列表。例如，一款游戏可能会保存一份高分列表，社交应用会保存一份好友列...
Output array to CSV in Ruby
It's easy enough to read a CSV file into an array with Ruby but I can't find any good documentation on how to write an array into a CSV file. Can anyone tell me how to do this?
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Avoid dropdown menu close on click inside
...red Oct 3 '15 at 12:44
ArbejdsglædeArbejdsglæde
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How to add pandas data to an existing csv file?
I want to know if it is possible to use the pandas to_csv() function to add a dataframe to an existing csv file. The csv file has the same structure as the loaded data.
...