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App Inventor 2 UrsPahoMqttClient 拓展 - 物联网轻量级MQTT协议 · App Inventor 2 中文网
...计的轻量级协议，基于TCP协议实现。
MQTT 协议文档：https://mqtt.org/
虽然 App Inventor 有现成的 MQTT 扩展，但它们需要额外的 JavaScript 或外部配置文件。此处介绍的 MQTT 客户端组件完全独立工作，不需要任何外部元素。...
Format number to always show 2 decimal places
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jsfiddle.net/Artistan/qq895bnp/28 there are "times" when toFixed will work, but it is quite inconsistent. :)
– Artistan
Jul 19 '17 at 17:06
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How to get a path to a resource in a Java JAR file
...classloader does not have to provide a file handle to the resource, for example the jar file may not have been expanded into individual files in the file system.
Anything you can do by getting a java.io.File could be done by copying the stream out into a temporary file and doing the same, if a java...
Why doesn't CSS ellipsis work in table cell?
Consider the following example: ( live demo here )
11 Answers
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90后创业四年:曾经觉得不公 后来愿赌服输 - 资讯 - 清泛网 - 专注C/C++及内核技术
...陌生人一旦成了熟人，他们的第一句话是我们加微信或加QQ，然后这个用户就流失了。中国最大的陌生人社交应用陌陌做本地化的群组，也是为了形成一个闭环。2014年我们做陌生人私密轻社交应用“萌萌搭”，做了两个月发现不...
What is your single most favorite command-line trick using Bash? [closed]
...it has the added benefit of making you sound really angry about it too. "Computer, do this." "Access denied". "DO IT!!"
– nickf
Sep 16 '08 at 1:16
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How to crop an image in OpenCV using Python
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It's very simple. Use numpy slicing.
import cv2
img = cv2.imread("lenna.png")
crop_img = img[y:y+h, x:x+w]
cv2.imshow("cropped", crop_img)
cv2.waitKey(0)
share...
Create a git patch from the uncommitted changes in the current working directory
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edited Sep 5 at 19:30
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Remove a fixed prefix/suffix from a string in Bash
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Thanks for the Notes! qq: in your code example you also have a forward slash / right after the string, what is that for?
– DiegoSalazar
May 15 '19 at 15:29
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How does this giant regex work?
... is a backdoor, and you must remove it immediately. Your system maybe compromised further.
This is what the backdoor looks like when it is accessed:
the hex part of the code:
\x65\x76\x61\x6C\x28\x67\x7A\x69\x6E\x66\x6C\x61\x74\x65\x28\x62\x61\x73\x65\x36\x34\x5F\x64\x65\x63\x6F\x64\x65\x28...