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做了个购物清单App后，我才真正搞懂App Inventor 2的变量 - App应用开发 - ...
...initialize local itemQty to TextBoxQty.Text
if itemName != "" then:
add items to list: global shoppingList
set global totalCount to totalCount + 1
关键理解：initialize local...
What is WebKit and how is it related to CSS?
...onger uses Presto since Feb 2013, consider Opera = Chrome, therefore Blink nowadays)
Safari → WebKit
Chrome → Blink (a fork of Webkit).
See Comparison of web browser engines for a list of comparisons in different areas.
The ultimate question... is WebKit supported by IE?
Not natively.
...
Setting Access-Control-Allow-Origin in ASP.Net MVC - simplest possible method
...
WebAPI 2 now has a package for CORS which can be installed using :
Install-Package Microsoft.AspNet.WebApi.Cors -pre -project WebServic
Once this is installed, follow this for the code :http://www.asp.net/web-api/overview/security/e...
postgres default timezone
...ement with my database name and SELECT pg_reload_conf() returned true, but now() and select current_setting('TIMEZONE') continue to return values for 'America/New_York'. Is it because I'm not superuser?
– Noumenon
Jul 23 '19 at 4:12
...
How can I shift-select multiple checkboxes like GMail?
...//abcoder.com/javascript/jquery/simple-check-uncheck-all-jquery-function/ (now dead):
JavaScript and HTML code
var NUM_BOXES = 10;
// last checkbox the user clicked
var last = -1;
function check(event) {
// in IE, the event object is a property of the window object
// in Mozilla, ...
AngularJS access parent scope from child controller
... the parent scope can have potential namespace conflicts, and 2. Requires knowledge that parent controller alias is 'pc'. This makes re-use more difficult.
– tchen
Jul 31 '14 at 15:52
...
How Do You Clear The IRB Console?
... With zsh ctrl + L doesn't work, ctrl + K does. (Oh My ZSH to be specific)
– SidOfc
Jul 20 '15 at 14:33
...
Visual Studio 2013 doesn't discover unit tests
... Eventually I figured out it was #2 in my list, so I wanted to leave that knowledge, plus the other tricks I've picked up over time.
– AndyG
Mar 18 '15 at 18:50
7
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Mapping a function on the values of a map in Clojure
...
I agree. I didn't know the into function, but it makes perfect sense using it here.
– Thomas
Nov 5 '09 at 5:40
...
How to concatenate strings of a string field in a PostgreSQL 'group by' query?
...in any aggregate expression; otherwise, the order is undefined. So you can now write:
SELECT company_id, string_agg(employee, ', ' ORDER BY employee)
FROM mytable
GROUP BY company_id;
Or indeed:
SELECT string_agg(actor_name, ', ' ORDER BY first_appearance)
PostgreSQL 8.4 or later:
PostgreSQL ...