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【BLE技术内幕】BLE技术揭秘 - 创客硬件开发 - 清泛IT论坛，有思想、有深度
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BLE技术揭秘
BLE是低功耗蓝牙的英文缩写（Bluetooth Low Energy），是蓝牙4.0版本起开始支持的新的、低功耗版本的蓝牙技术规范。蓝牙技术联盟（Bluetooth SIG）在2010年发布了跨...
What is the difference between partitioning and bucketing a table in Hive ?
I know both is performed on a column in the table but how is each operation different.
8 Answers
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Using HTML5/Canvas/JavaScript to take in-browser screenshots
...
JavaScript can read the DOM and render a fairly accurate representation of that using canvas. I have been working on a script which converts HTML into a canvas image. Decided today to make an implementation of it into sending feedbacks like you described.
The script allows you to create feed...
Lock, mutex, semaphore… what's the difference?
...threads to enter, this can be used for example to limit the number of cpu, io or ram intensive tasks running at the same time.
For a more detailed post about the differences between mutex and semaphore read here.
You also have read/write locks that allows either unlimited number of readers or 1 wr...
JAX-RS — How to return JSON and HTTP status code together?
... = //convert entity to json
return Response.ok(json, MediaType.APPLICATION_JSON).build();
}
Take a look at the Response class.
Note that you should always specify a content type, especially if you are passing multiple content types, but if every message will be represented as JSON, you can ...
Bootstrap carousel multiple frames at once
....
Bootstrap 4
The carousel has changed in 4.x, and the multi-slide animation transitions can be overridden like this...
.carousel-inner .carousel-item-right.active,
.carousel-inner .carousel-item-next {
transform: translateX(33.33%);
}
.carousel-inner .carousel-item-left.active,
.carousel-inn...
How can you encode a string to Base64 in JavaScript?
...() to convert to and from base64 encoding.
There appears to be some confusion in the comments regarding what these functions accept/return, so…
btoa() accepts a “string” where each character represents an 8-bit byte – if you pass a string containing characters that can’t be represented ...
Best practice for Django project working directory structure
...h have a bit different structure.:
Stand-alone websites
Pluggable applications
Stand-alone website
Mostly private projects, but doesn't have to be. It usually looks like this:
~/projects/project_name/
docs/ # documentation
scripts/
manage.py # installed to PATH via setup.p...
淘宝网采用什么技术架构来实现网站高负载的 - 更多技术 - 清泛网 - 专注C/C...
...可用性的分布式互联网应用。
一、应用无状态(淘宝session框架)
俗话说，一个系 统的伸缩性的好坏取决于应用的状态如何管理。为什么这么说呢?咱们试想一下，假如我们在session中保存了大量与客户端的状态信 息的话，那么当...
Simple way to transpose columns and rows in SQL?
...your original post, you stated that PIVOT seems too complex for this scenario, but it can be applied very easily using both the UNPIVOT and PIVOT functions in SQL Server.
However, if you do not have access to those functions this can be replicated using UNION ALL to UNPIVOT and then an aggregate f...