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App Inventor 2 文本代码块 · App Inventor 2 中文网
...则当一个key是另一个key的子串时，第一个被替换是较长的那个。
案例：文本转数字
App Inventor 2 是弱语言类型，文本和数字之间不用刻意去转换，之间赋值就可以了。文本赋值给数字变量如下：
运行结果：124
注意：数字变...
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...
大数据：用数据指导APP运营 - 资讯 - 清泛网 - 专注C/C++及内核技术
...品特性去设定需要获取哪些数据。
我们拿最近很火的那个App——足记来举个例子吧。
“足记”因为一个非核心功能火了，但作为这样的应用，它会关注哪些数据呢？
从产品的层面，它会去关注：
1）App每日的打开数
2）各...
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...
实战做项目如何选择开源许可协议（一）-了解协议 - 开源 & Github - 清泛网...
...于这个协议的项目，极大的提高了开源软件的数量。上面那个微博的案例，如果作者使用了GPL协议，而使用方所写代码的软件包再发布时没有公开源代码就是违反了协议(多谢Sunny2038纠正)。目前用的多的是GPLV1，GPLV2。这两个什么...
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...