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移动前端开发之viewport的深入理解 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...设备ideal viewport的宽度都为多少，可以到http://viewportsizes.com去查看一下，里面收集了众多设备的理想宽度。
再总结一下：ppk把移动设备上的viewport分为layout viewport 、 visual viewport 和 ideal viewport 三类，其中的ideal viewport是最...
What is the difference between localStorage, sessionStorage, session and cookies?
...rage mechanisms will be specific to an individual browser on an individual computer/device. Any requirement to store data on an ongoing basis across sessions will need to involve your application server side - most likely using a database, but possibly XML or a text/CSV file.
localStorage, sessionS...
What are the differences between a pointer variable and a reference variable in C++?
...s heap. This implies that there is a real address of a reference that the compiler will not tell you.
int x = 0;
int &r = x;
int *p = &x;
int *p2 = &r;
assert(p == p2);
You can have pointers to pointers to pointers offering extra levels of indirection. Whereas references only offer ...
When is JavaScript synchronous?
...al that's pretty good at explaining the basics of async here: net.tutsplus.com/tutorials/javascript-ajax/…
– RobW
Apr 27 '13 at 4:30
26
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Adding a Method to an Existing Object Instance
...tribute themselves):
>>> a.fooFighters()
fooFighters
The problem comes when you want to attach a method to a single instance:
>>> def barFighters( self ):
... print "barFighters"
...
>>> a.barFighters = barFighters
>>> a.barFighters()
Traceback (most recent c...
No ConcurrentList in .Net 4.0?
...aster. Basically, adding to a List<T> is lightning fast already; the complexity of the computational steps involved is miniscule (increment an index and assign to an element in an array; that's really it). You would need a ton of concurrent writes to see any sort of lock contention on this; an...
Explain the use of a bit vector for determining if all characters are unique
... here. @Dejel Here's the java data structure that you can use: docs.oracle.com/javase/7/docs/api/java/util/BitSet.html. Hopefully this helps someone traveling through the intertubes.
– nattyddubbs
Jan 20 '14 at 16:06
...
How to move a model between two Django apps (Django 1.7)
...a loss. As ozan mentioned, we can create 2 migrations one in each app. The comments below this post refer to my old answer.
First migration to remove model from 1st app.
$ python manage.py makemigrations old_app --empty
Edit migration file to include these operations.
class Migration(migrations...
UITableViewCell with UITextView height in iOS 7?
...ote, that there is a big difference between UITextView and UILabel when it comes to how text is rendered. Not only does UITextView have insets on all borders, but also the text layout inside it is slightly different.
Therefore, sizeWithFont: is a bad way to go for UITextViews.
Instead UITextView its...
What are the main uses of yield(), and how does it differ from join() and interrupt()?
...
Source: http://www.javamex.com/tutorials/threads/yield.shtml
Windows
In the Hotspot implementation, the way that Thread.yield() works has
changed between Java 5 and Java 6.
In Java 5, Thread.yield() calls the Windows API call Sleep(0). ...