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App Inventor 2 中文网 · 项目指南
... 官方英文原版 基本定制 版本过旧 文档教程 深度理解后的中文翻译且不断进化，案例本土化 ...
What is the difference between a Docker image and a container?
...with docker images whereas you can see your running containers with docker ps (and you can see all containers with docker ps -a).
So a running instance of an image is a container.
share
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improve t...
How can I change the color of my prompt in zsh (different from normal text)?
...
Here's an example of how to set a red prompt:
PS1=$'\e[0;31m$ \e[0m'
The magic is the \e[0;31m (turn on red foreground) and \e[0m (turn off character attributes). These are called escape sequences. Different escape sequences give you different results, from absolute cu...
Is Tomcat running?
...
Why grep ps, when the pid has been written to the $CATALINA_PID file?
I have a cron'd checker script which sends out an email when tomcat is down:
kill -0 `cat $CATALINA_PID` > /dev/null 2>&1
if [ $? -gt 0 ]
then
echo ...
How do you do a ‘Pause’ with PowerShell 2.0?
...ly excludes Shift, Alt, Ctrl modifier keys.
Disadvantage: Does not work in PS-ISE.
<2> ReadKey (RawUI)
Write-Host "Press any key to continue ..."
$x = $host.UI.RawUI.ReadKey("NoEcho,IncludeKeyDown")
Disadvantage: Does not work in PS-ISE.
Disadvantage: Does not exclude modifier keys.
&l...
数据存储组件 · App Inventor 2 中文网
...用程序是AI伴侣运行还是已编译、以及应用运行的 Android 版本。
由于较新版本的 Android 要求将文件存储在App特定目录中，因此 默认作用域 设置为 App，如果使用的是旧版 Android 并且需要访问兼容的公共存储，将 默认作用域 属性...
How do I get only directories using Get-ChildItem?
...3.0:
The FileInfo object returned by Get-ChildItem has a "base" property, PSIsContainer. You want to select only those items.
Get-ChildItem -Recurse | ?{ $_.PSIsContainer }
If you want the raw string names of the directories, you can do
Get-ChildItem -Recurse | ?{ $_.PSIsContainer } | Select-Ob...
用户界面（UI）组件 · App Inventor 2 中文网
...屏幕都拥有“关于屏幕”的信息。
交互性颜色
这是新版本Android中用于突出显示和其他用户界面交互的交互性颜色。受此属性影响的包括 对话框、日期选择框 等组件触发的弹出框。
PrimaryColor： 主题颜色。app的主要...
Terminating a script in PowerShell
I've been looking for a way to terminate a PowerShell (PS1) script when an unrecoverable error occurs within a function. For example:
...
Is MATLAB OOP slow or am I doing something wrong?
...of functions and methods. Here are some typical results.
>> call_nops
Computer: PCWIN Release: 2009b
Calling each function/method 100000 times
nop() function: 0.02261 sec 0.23 usec per call
nop1-5() functions: 0.02182 sec 0.22 usec per call
nop() subfunction...