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App Inventor 2 数学代码块 · App Inventor 2 中文网
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How to atomically delete keys matching a pattern using Redis
...sclaimer: the following solution doesn't provide atomicity.
Starting with v2.8 you really want to use the SCAN command instead of KEYS[1]. The following Bash script demonstrates deletion of keys by pattern:
#!/bin/bash
if [ $# -ne 3 ]
then
echo "Delete keys from Redis matching a pattern using ...
Get average color of image via Javascript
...
AFAIK, the only way to do this is with <canvas/>...
DEMO V2: http://jsfiddle.net/xLF38/818/
Note, this will only work with images on the same domain and in browsers that support HTML5 canvas:
function getAverageRGB(imgEl) {
var blockSize = 5, // only visit every 5 pixels
...
Java 理论与实践: 线程池与工作队列 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...并发实用程序，这个包应该用于 Java 开发工具箱 1.5 发行版。
结束语
线程池是组织服务器应用程序的有用工具。它在概念上十分简单，但在实现和使用一个池时，却需要注意几个问题，例如死锁、资源不足和wait() 及 notify(...
Shell脚本编程30分钟入门 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...老牌的脚本编程语言了，Python这些年也成了一些linux发行版的预置解释器。
编译型语言，只要有解释器，也可以用作脚本编程，如C shell是内置的（/bin/csh），Java有第三方解释器Jshell，Ada有收费的解释器AdaScript。
如下是一个PHP S...
How to send a command to all panes in tmux?
...
None of the above answers worked for me (tmux v2.3), but this did, from the bash command line:
for _pane in $(tmux list-panes -a -F '#{pane_id}'); do \
tmux clear-history -t ${_pane} ; done
A more generalized script, for tmux commands other than 'clear-history' wou...
Remove local git tags that are no longer on the remote repository
...
Looks like recentish versions of Git (I'm on git v2.20) allow one to simply say
git fetch --prune --prune-tags
Much cleaner!
https://git-scm.com/docs/git-fetch#_pruning
You can also configure git to always prune tags when fetching:
git config fetch.pruneTags true
If...
Capistrano - clean up old releases
... Thank you, Diego. Your answer works correctly in Capistrano v2.14.1.
– scarver2
Jan 30 '13 at 16:28
1
...
jQuery: Get height of hidden element in jQuery
...sions of jquery" on the Actual website - however - it is still required in v2.1.3, at least it was in my situation.
– LpLrich
Mar 30 '15 at 14:34
...
How do I use Notepad++ (or other) with msysgit?
...
As of Git for Windows v2.15.0 (October 30th 2017) it is now possible to configure nano or Notepad++ as Git's default editor instead of vim.
During the installation you'll see the following screen:
...