大约有 40,700 项符合查询结果（耗时：0.0518秒） [XML]
App Inventor 2 项目合并工具 AIMerge · App Inventor 2 中文网
...e database or asset but they must be named the same (for more details on this see the Universal Databases and Assets section below). Finally, no two different screens or assets can have the same name (with the exception of “Screen1” which can be renamed). For these reasons it is important to dec...
How to set auto increment primary key in PostgreSQL?
...
Try this command:
ALTER TABLE your_table ADD COLUMN key_column BIGSERIAL PRIMARY KEY;
Try it with the same DB-user as the one you have created the table.
...
Why am I suddenly getting a “Blocked loading mixed active content” issue in Firefox?
This morning, upon upgrading my Firefox browser to the latest version (from 22 to 23), some of the key aspects of my back office (website) stopped working.
...
How to remove convexity defects in a Sudoku square?
...nslate it to OpenCV yourself. It's written in Mathematica.
The first step is to adjust the brightness in the image, by dividing each pixel with the result of a closing operation:
src = ColorConvert[Import["http://davemark.com/images/sudoku.jpg"], "Grayscale"];
white = Closing[src, DiskMatrix[5]];
...
What's the best Django search app? [closed]
...here's a django.contrib.search , I have to choose a search app. So, which is the best? By "best" I mean...
15 Answers
...
What is “above-the-fold content” in Google Pagespeed?
...ng about such as the query string from web fonts. I was very happy with this as this represented all that I could do.
4 An...
How to find if a given key exists in a C++ std::map
I'm trying to check if a given key is in a map and somewhat can't do it:
14 Answers
14...
Understanding Fragment's setRetainInstance(boolean)
...our questions:
Does the fragment also retain its view state, or will this be recreated on configuration change - what exactly is "retained"?
Yes, the Fragment's state will be retained across the configuration change. Specifically, "retained" means that the fragment will not be destroyed on con...
how to deal with google map inside of a hidden div (Updated picture)
i have a page and a google map is inside a hidden div at first. I then show the div after i click a link but only the top left of the map shows up.
...
Best way to initialize (empty) array in PHP
...nguages (AS3 for example), it has been noted that initializing a new array is faster if done like this var foo = [] rather than var foo = new Array() for reasons of object creation and instantiation. I wonder whether there are any equivalences in PHP?
...