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Scratch还是App Inventor？低代码编程工具2026终极横评：谁才是真正的入门...
...编程，和以App Inventor 2为代表的可视化App开发平台。
但问题来了——它们看起来都是"拖积木写程序"，到底该选哪个？这篇文章，我们把两个平台放在同一张桌上，从七个关键维度逐一PK。
逐一PK：七个维度正面硬刚
...
BLE（二）信道&数据包&协议栈格式 - 创客硬件开发 - 清泛IT社区，...
...。
Service和Characteristic则是比较重要的，Service可以理解为PHP中的“类”、功能对象的集合。Characteristic可以理解为PHP的“函数”，是GATT中具体的功能对象，每个Service都可以包含一个或多个Characteristic（特征）。Characteristic是GATT pr...
使用App Inventor 2 控制物联网设备/低功耗蓝牙设备(BLE) · App Inventor 2 中文网
...接。 因此，我们开发蓝牙 LE 组件是为了解决物联网连接问题。
三． 技术方法
BluetoothLE 组件是 MIT App Inventor 的新颖补充。 如图 4 所示，在 MIT App Inventor 平台上创建时，BLE 组件可以作为移动应用程序的一部分实现。 然后，该...
Nginx no-www to www and www to no-www
...n.php last;
# etc etc...
}
}
Note: I have not originally included https:// in my solution since we use loadbalancers and our https:// server is a high-traffic SSL payment server: we do not mix https:// and http://.
To check the nginx version, use nginx -v.
Strip www from ...
Static/Dynamic vs Strong/Weak
I see these terms bandied around all over the place in programming and I have a vague notion of what they mean. A search shows me that such things have been asked all over stack overflow in fact. As far as I'm aware Static/Dynamic typing in languages is subtly different to Strong/Weak typing but wha...
CodeIgniter - accessing $config variable in view
...
Your controller should collect all the information from databases, configs, etc. There are many good reasons to stick to this. One good reason is that this will allow you to change the source of that information quite easily and not have to make any change...
Why are dates calculated from January 1st, 1970?
...1st, 1970) as default standard
The Question makes two false assumptions:
All time-tracking in computing is done as a count-since-1970.
Such tracking is standard.
Two Dozen Epochs
Time in computing is not always tracked from the beginning of 1970 UTC. While that epoch reference is popular, various...
What's the difference between utf8_general_ci and utf8_unicode_ci?
...languages or characters.
On modern servers, this performance boost will be all but negligible. It was devised in a time when servers had a tiny fraction of the CPU performance of today's computers.
Benefits of utf8mb4_unicode_ci over utf8mb4_general_ci
utf8mb4_unicode_ci, which uses the Unicode r...
pdf2htmlEX实现pdf转html - 开源 & Github - 清泛网 - 专注C/C++及内核技术
...lEX.min.js。原因：移动终端浏览器对CSS定位absolute的支持有问题（不会出现滚动条），所以需要为所有页面的容器设置高度，这样，手机浏览器就可以出现滚动条了。修改和添加的js代码如下：
//文件最后加上：
window.onload=functi...
Illegal mix of collations (utf8_unicode_ci,IMPLICIT) and (utf8_general_ci,IMPLICIT) for operation '=
...:
SET @rUsername = ‘aname’ COLLATE utf8_unicode_ci; -- COLLATE added
CALL updateProductUsers(@rUsername, @rProductID, @rPerm);
Option 2: add COLLATE to the WHERE clause:
CREATE PROCEDURE updateProductUsers(
IN rUsername VARCHAR(24),
IN rProductID INT UNSIGNED,
IN rPerm VARCHAR(16...