大约有 14,000 项符合查询结果（耗时：0.0268秒） [XML]
请问各位前辈大佬关于APP熄灭屏幕后停止响应的问题。 - App Inventor 2 拓...
各位大佬好 我刚开始学习 APP INVENTOR编程。 尝试写了一个与MQTT服务器通讯的小程序。 这个小程序在手机当前程序状态运行正常 手机切换到别的应用 也运行正常。 但是 当手机屏幕熄灭 ， 刚熄灭的时候 还能正常接收MQTT的信...
Modbus硬件控制02——modbus继电器 - 创客硬件开发 - 清泛IT社区，为创新赋能！
...功能
本模块具备一路数字输入和一路数字输出，还具备一个标准的 RS-485 通讯接口，通信使用MODBUS-RTU 协议。本模块支持所有常见波特率、停止位和校验位的组合，并可任意设置 MODBUS地址。本模块必须与上位机共地。
三、...
Testing HTML email rendering [closed]
...newsletters and e-blasts that gatewaypeople.com sends to it's subscribers. Excellent tool with insightful viewing of all popular email clients!
– scarver2
Jun 27 '13 at 12:50
...
How to run SQL script in MySQL?
...
Excellent advice from @elcuco! Also, probably use another flag after -p (or have that be the last arg) so another parameter is not erroneously taken to be the intended password.
– davernator
...
How do I use the CONCAT function in SQL Server 2008 R2?
...NULL(CAST(data2 AS varchar(MAX)), '')
These two solutions collate several excellent answers and caveats raised by other posters including @Martin Smith, @Svish and @vasin1987.
These options add NULL to '' (empty string) casting for safe NULL handling while accounting for the varying behaviour of t...
what’s the difference between Expires and Cache-Control headers?
...
Heroku devcenter has an excellent article on this subject.
Quoting from it,
While the Cache-Control header turns on client-side caching and sets the max-age of a resource, the Expires header is used to specify a specific point in time the reso...
How does one capture a Mac's command key via JavaScript?
...
For people using jQuery, there is an excellent plugin for handling key events:
jQuery hotkeys on GitHub
For capturing ⌘+S and Ctrl+S I'm using this:
$(window).bind('keydown.ctrl_s keydown.meta_s', function(event) {
event.preventDefault();
// Do some...
How to make good reproducible pandas examples
...at need a special but easily shared dataframe, like this one I build it in excel, copy it to my clipboard, then instruct SOers to do the same. Saves so much time!
– zelusp
Apr 13 '16 at 17:32
...
How to select the nth row in a SQL database table?
... and above has this feature built-in. Use the ROW_NUMBER() function. It is excellent for web-pages with a << Prev and Next >> style browsing:
Syntax:
SELECT
*
FROM
(
SELECT
ROW_NUMBER () OVER (ORDER BY MyColumnToOrderBy) AS RowNum,
*
FROM...
Cannot ignore .idea/workspace.xml - keeps popping up
...t I was missing was to make sure my IDE was closed - don't miss that step! Excellent answer :)
– Jonny Asmar
Jan 14 '17 at 18:40
...