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App Inventor 2在不同的屏幕之间传值 · App Inventor 2 中文网
...下：
列表传值
如果有两个变量，该如何操作？这里提供两种思路：
1、多个变量可以用逗号拼在一起当成一个文本传递过去后，然后使用文本里的函数分割开就是多个变量了。
2、使用列表变量传递（列表...
How to set Oracle's Java as the default Java in Ubuntu?
...TM) Server VM (build 25.5-b02, mixed mode)
also note that you might need root permission or be in sudoers group to be able to do this. I've tested this solution on both ubuntu 12.04 and Debian wheezy and it works in both of them.
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Pretty printing XML in Python
...not elem.tail.strip()):
elem.tail = j
return elem
root = ElementTree.parse('/tmp/xmlfile').getroot()
indent(root)
ElementTree.dump(root)
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Enabling HTTPS on express.js
...bably want to use something like 8443 because most systems don't allow non-root listeners on low-numbered ports.
– ebohlman
Aug 1 '12 at 6:48
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Delete all local changesets and revert to tree
... even smarter approach is to use the revset language, and do:
% hg strip 'roots(outgoing())'
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Pinging servers in Python
...ng
It is pretty simple to use, however, when using this module, you need root access due to the fact that it is crafting raw packets under the hood.
import pyping
r = pyping.ping('google.com')
if r.ret_code == 0:
print("Success")
else:
print("Failed with {}".format(r.ret_code))
...
Determine command line working directory when running node bin script
...s desirable to run an NPM script in the current directory, rather than the root of the project.
This variable is available inside npm package scripts as:
$INIT_CWD.
You must be running a recent version of NPM. If this variable is not available, make sure NPM is up to date.
This will allow you a...
When should I use a NoSQL database instead of a relational database? Is it okay to use both on the s
...roblems where a RDBMS is not a viable solution, for all other things I use MySQL (or SQLite for testing).
If you need a NoSQL db you usually know about it, possible reasons are:
client wants 99.999% availability on
a high traffic site.
your data makes
no sense in SQL, you find yourself
doing mult...
Where do I put image files, css, js, etc. in Codeigniter?
... One better might be to have a your assets folder in the web root (mine is public_html) folder and then CI in a directory above the web root.
– Nate Nolting
Aug 7 '14 at 21:39
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AngularJS access parent scope from child controller
...other controllers, you can install a "hook" to the global scope:
function RootCtrl($scope) {
$scope.root = $scope;
}
Then in any child controller, you can access the "global" scope with $scope.root. Anything you set here will be globally visible.
Example:
function RootCtrl($scope) {
...