大约有 47,000 项符合查询结果（耗时：0.0766秒） [XML]
JavaScript string encryption and decryption?
I'm interested in building a small app for personal use that will encrypt and decrypt information on the client side using JavaScript. The encrypted information will be stored in a database on a server, but never the decrypted version.
...
problem with and :after with CSS in WebKit
...n a select box with the pseudo :after (to style my select box with 2 parts and without images). Here's the HTML:
9 Answers
...
Can't find the 'libpq-fe.h header when trying to install pg gem
...nx), 11.10 (Oneiric Ocelot), 12.04 (Precise Pangolin), 14.04 (Trusty Tahr) and 18.04 (Bionic Beaver)):
...
/usr/include/postgresql/libpq-fe.h
...
So try installing libpq-dev or its equivalent for your OS:
For Ubuntu/Debian systems: sudo apt-get install libpq-dev
On Red Hat Linux (RHEL) systems:...
Setting the zoom level for a MKMapView
...
I found myself a solution, which is very simple and does the trick. Use MKCoordinateRegionMakeWithDistance in order to set the distance in meters vertically and horizontally to get the desired zoom. And then of course when you update your location you'll get the right coor...
Big-oh vs big-theta [duplicate]
...
Big-O is an upper bound.
Big-Theta is a tight bound, i.e. upper and lower bound.
When people only worry about what's the worst that can happen, big-O is sufficient; i.e. it says that "it can't get much worse than this". The tighter the bound the better, of course, but a tight bound isn't...
What is the X-REQUEST-ID http header?
... this subject, read various articles about this header, its use in Heroku, and projects based on Django.
4 Answers
...
Why em instead of px?
I heard you should define sizes and distances in your stylesheet with em instead of in pixels. So the question is why should I use em instead of px when defining styles in css? Is there a good example that illustrates this?
...
Setting default values for columns in JPA
Is it possible to set a default value for columns in JPA, and if, how is it done using annotations?
18 Answers
...
What is a typedef enum in Objective-C?
I don't think I fundamentally understand what an enum is, and when to use it.
13 Answers
...
Swift compiler error: “non-modular header inside framework module”
Now I would like to migrate my ObjC framework to Swift and I got the following error:
20 Answers
...