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AppInventor2有没有删除撤销功能？ - App应用开发 - 清泛IT社区，为创新赋能！
问：不小心删除了组件，能撤回吗？
答：界面（组件）设计界面，没有撤销功能。代码（逻辑）设计视图，可以使用 Ctrl+Z 撤销，Ctrl+Y 反撤销。
界面设计没有撤销功能，有时不小心删除了组件，真的就没法恢复了，有时真...
如何实现循环振动、循环播放音效 - App Inventor 2 中文网 - 清泛IT社区，为创新赋能！
在计时软件中设置了播放按钮、停止按钮，使用了音效组件调取上传的音效文件，同时使用了音效组件振动，设置了音效振动毫秒数，但是每次计时结束后播放时的音效只是一次性的，请问如何实现在没有点击停止按钮的情况下...
How do I download a tarball from GitHub using cURL?
...
with a specific dir
cd your_dir && curl -L https://download.calibre-ebook.com/3.19.0/calibre-3.19.0-x86_64.txz | tar zx
share
|
improv...
Upgrade python in a virtualenv
...commands (<EXISTING_ENV_PATH> is path of your virtual environment):
cd <EXISTING_ENV_PATH>
rm .Python
rm bin/pip{,2,2.7}
rm bin/python{,2,2.7}
rm -r include/python2.7
rm lib/python2.7/*
rm -r lib/python2.7/distutils
rm lib/python2.7/site-packages/easy_install.*
rm -r lib/python2.7/site-...
How can I brew link a specific version?
...ar/<packagename>/<version> from source you can do for example
cd ~/somewhere/src/foo-2.0.4
./configure --prefix $(brew --Cellar)/foo/2.0.4
make
check where it gets installed with
make install -n
if all looks correct
make install
Then from cd $(brew --Cellar) do the switch betwee...
MySQL table is marked as crashed and last (automatic?) repair failed
... On Debian:
sudo service mysql stop
Go to your data folder. On Debian:
cd /var/lib/mysql/$DATABASE_NAME
Try running:
myisamchk -r $TABLE_NAME
If that doesn't work, you can try:
myisamchk -r -v -f $TABLE_NAME
You can start your MySQL server again. On Debian:
sudo service mysql start
...
Git rebase: conflicts keep blocking progress
...n a test repository. First create the repository.
$ mkdir failing-merge
$ cd failing-merge
$ git init
Initialized empty Git repository in $HOME/failing-merge/.git/
Then commit the original content of version.txt in master.
$ echo v1.4-alpha-02 > version.txt
$ git add version.txt
$ git commit ...
Is there a way to cause git-reflog to show a date alongside each entry?
...ectly with the --pretty= flag to format the output.
git reflog --pretty='%cd %h %gd %gs'
In the format above, %cd shows the commit date to the left of the normal reflog output.
share
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improve th...
Create a new Ruby on Rails application using MySQL instead of SQLite
...2 seems to be the go-to gem these days for Rails.
– rcd
Jan 5 '14 at 21:27
13
...
How to change Git log date formats
...bit easier on the eyes.
Better still, for this particular example, using %cd will honor the --date=<format>, so if you want YYYY-MM-DD, you can do this and avoid %< and %x08 entirely:
git log --date=short --pretty='format:%h %s%n\t%cd, %an <%ae>'
I just noticed this was a bit ci...