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App Inventor 2 串口调试 App 全方案技术调研 - App应用开发 - 清泛IT社区，为创新赋能！
...；可在代理层实现协议解析
缺点：需要额外硬件（ESP30-50元）；需要写固件代码；引入网络延迟（约5-20ms）
推荐度：★★★ 适合 IoT 项目
方案6：TCP/UDP 网络串口
手机 --WiFi-- 串口服务器 --RS232/RS485-- 工业设备
优点：适合...
Can I stretch text using CSS?
...32px;
transform: scaleY(0.5);
transform-origin: 0 0;
margin-bottom: -50%;
}
span {
font-size: 16px;
vertical-align: top;
}
<span class="stretched-text">this is some stretched text</span>
<span>and this is some random<br />triple line <br />not stretched text&...
Heroku “psql: FATAL: remaining connection slots are reserved for non-replication superuser connectio
...|
edited Jun 16 '17 at 20:50
answered Aug 7 '12 at 14:58
kg...
Can't find a “not equal” css attribute selector
... Suppose there are 100 divs out of which foo value is absent(foo='') for 50 divs and other 50 divs have different foo value say foo=x or y etc then you need to write 50 selectors if we follow above solution
– Shoaib Chikate
Aug 13 '14 at 13:23
...
Vim: Replacing a line with another one yanked before
...
Can you give an example? When I press e.g. 50Gm30G Vim goes to line 50 and then to the bottom and that's it. Also :Ad doesn't do anything for A=50 or A=50G
– crispy
Feb 1 '12 at 8:52
...
Github Push Error: RPC failed; result=22, HTTP code = 413
...Solution for nginx
Just load your nginx.conf and add client_max_body_size 50m; ( changing the value to your needs ) in the http block.
Reload nginx to accept the new config by executing sudo service nginx reload and try again to push your commit over http.
Solution for Apache
In your httpd.conf...
Can I change the size of UIActivityIndicator?
...
50
The size is fixed by the style. It's a standardized interface element so the API doesn't like t...
Why does 2 mod 4 = 2?
...amples:
23 % 10 evaluates to 3 (because 23/10 is 2 with a remainder of 3)
50 % 50 evaluates to 0 (50/50 is 1 with a remainder of 0)
9 % 100 evaluates to 9 (9/100 is 0 with a remainder of 9)
share
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...
How to align absolutely positioned element to center?
...lement without knowing it's width and height do:
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
Example:
*{
margin:0;
padding:0;
}
section{
background:red;
height: 100vh;
width: 100vw;
}
div{
width: 80vw;
height: 80vh;
background: wh...
I need to store postal codes in a database. How big should the column be?
...
Note that Montserrat is only 8 chars, 1110-1350 denotes a range. discovermni.com/about-montserrat/montserrat-post-codes
– Vajk Hermecz
Mar 6 '18 at 22:30
...