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Detecting an undefined object property
... foo.bar === 'undefined') {
⋮
}
is always exactly equivalent to this³:
if (foo.bar === undefined) {
⋮
}
and taking into account the advice above, to avoid confusing readers as to why you’re using typeof, because it makes the most sense to use === to check for equality, because it co...
国务院:网速提40%流量不清零 三运营商尚未回应 - 资讯 - 清泛网 - 专注C/C+...
...
李克强最后强调，提网速、降网费，不仅需要工信部和通信运营商不懈努力，还需要有关部门通力合作，为电信企业提供良好的营商环境，最终便利亿万网民。
【总理语录】
●我们去年一亿多人次出国旅游，结果出国漫游的...
低功耗蓝牙(BLE) 和 经典蓝牙(SPP) 的区别 · App Inventor 2 中文网
...路用于数据交换。
传输距离
距离较短，通信范围一般为10米左右。
通信距离较远，可达100米。
传输速率
低带宽：BLE数据速率通常只有1Mbps或更低，主要用于低速度的控制类或监测类数据交...
MAC地址可以连上，硬件通信时提示无效的UUID？ - 创客硬件开发 - 清泛IT社...
...MAC地址填错了导致的，填了一个其他的非预期的地址，而通信时用的目标硬件uuid，匹配失败导致的。
[/hide]
经测试，我们的硬件mac地址是：
E2:E0:5A:46:86:2F
使用MAC地址连接，一切功能正常。
这个 APP程序 使用透传UUID 还可...
蓝牙通信接收的信息出现乱码？ - App应用开发 - 清泛IT社区，为创新赋能！
...乱码，大概率是波特率设置不对，请注意检查。
2、保持通信两边统一的编码，例如都使用UTF8编码。ESP端请确认文件、字符串等编码格式，AppInventor端也可以设置编码格式。
波特率 是115200， 换了字符编码也不行ESP32 蓝牙发送...
Why does modern Perl avoid UTF-8 by default?
..., we got 12. Perl assumed that we were operating on the Latin-1 string "æååã" (which is 12 characters, some of which are non-printing).
This is called an "implicit upgrade", and it's a perfectly reasonable thing to do, but it's not what you want if your text is not Latin-1. That's why it's c...
Is the LIKE operator case-sensitive with MSSQL Server?
In the documentation about the LIKE operator , nothing is told about the case-sensitivity of it. Is it? How to enable/disable it?
...
How do I copy a string to the clipboard on Windows using Python?
...ith Unicode characters too. I have tested characters ±°©©αβγθΔΨΦåäö to work on Win10 64-bit, with Python 3.5 and pyperclip 1.5.27.
– np8
Jul 3 '16 at 15:55
...
HTML5 Canvas vs. SVG vs. div
What is the best approach for creating elements on the fly and being able to move them around? For example, let's say I want to create a rectangle, circle and polygon and then select those objects and move them around.
...
UCenter通信成功，通知失败的解决办法 - 建站技术 - 清泛IT论坛，有思想、有深度
/source/class/discuz/discuz_application.php
注释掉如下3行代码，亲测有效，原因目前未知，有兴趣可以研究一下。