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BLE（二）信道&数据包&协议栈格式 - 创客硬件开发 - 清泛IT社区，...
文章源自：https://www.gandalf.site/2018/11/ble_23.html
参考低功耗蓝牙（BLE）安全初探
0x1 信道BLE的物理通道即“频道，分别是‘f=2402+k*2 MHz, k=0, … ,39’，带宽为2MHz”的40个RF Channel。
其中，有3个信道是advertising channel（广播通道）...
Fastest way to check a string contain another substring in JavaScript?
... case-insensitive search is way faster with regular expressions.
Update 2018:
Just to save people from running the tests themselves, here are the current results for most common browsers, the percentages indicate performance increase over the next fastest result (which varies between browsers):
...
How can I override the OnBeforeUnload dialog and replace it with my own?
...ind syntax.
$(window).bind('beforeunload', function() {} );
Edit 09/04/2018: custom messages in onbeforeunload dialogs are deprecated since chrome-51 (cf: release note)
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Parse JSON in TSQL
... NVARCHAR(MAX))
AS
BEGIN
-- Author: Vitaly Borisov
-- Create date: 2018-03-23
;WITH crData AS (
SELECT CAST(NULL AS NVARCHAR(4000)) COLLATE DATABASE_DEFAULT AS [Parent]
,j.[Key] AS [Param],j.Value,j.Type
,j.[Key] AS [Path],0 AS [Level]
,j.[Key]...
How to detect the current OS from Gradle
...ratingSystem.isLinux()
Keep in mind that it's still incubating though.
Mid 2018 Update: just like it was mentioned in comments, now this class moved to a different package, so one should use org.gradle.nativeplatform.platform.OperatingSystem.current()
As of mid 2015, Peter Kahn's answer is still va...
Can Selenium Webdriver open browser windows silently in background?
...
EDIT
The initial answer was posted in 2014 and now we are at the cusp of 2018.Like everything else, browsers have also advanced. Chrome has a completely headless version now which eliminates the need to use any third party libraries to hide the UI window. Sample code is as follows:
from selen...
C++ mark as deprecated
...
Here is a more complete answer for 2018.
These days, a lot of tools allow you to not just mark something as deprecated, but also provide a message. This allows you to tell people when something was deprecated, and maybe point them toward a replacement.
There...
NSUserDefaults - How to tell if a key exists
...n behavior of the other types accessed through UserDefaults.
(Edit Aug 30 2018: Updated with more efficient syntax from Leo's suggestion.)
extension UserDefaults {
/// Convenience method to wrap the built-in .integer(forKey:) method in an optional returning nil if the key doesn't exist.
fu...
How do I run a Node.js application as its own process?
... journalctl -u myapp
This is taken from How we deploy node apps on Linux, 2018 edition, which also includes commands to generate an AWS/DigitalOcean/Azure CloudConfig to build Linux/node servers (including the .service file).
...
Why is ArrayDeque better than LinkedList
.... So we get O(1) performance. See: coffeeorientedprogramming.wordpress.com/2018/04/23/… (thus downvoting).
– Leo Ufimtsev
Apr 23 '18 at 19:11
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