大约有 9,000 项符合查询结果（耗时：0.0363秒） [XML]
How to detect if multiple keys are pressed at once using JavaScript?
...ray
onkeydown = onkeyup = function(e){
e = e || event; // to deal with IE
map[e.keyCode] = e.type == 'keydown';
/* insert conditional here */
}
This code is very simple: Since the computer only passes one keystroke at a time, an array is created to keep track of multiple keys. The array...
Why do we need RESTful Web Services?
...be used if it is very important for you to minimize the coupling between client and server components in a distributed application.
This may be the case if your server is going to be used by many different clients that you do not have control over. It may also be the case if you want to be able to...
When is assembly faster than C?
...mant code are both extremely rare and require expert knowledge of and experience with assembly.
40 Answers
...
How does the ARM architecture differ from x86? [closed]
... disappearing.
If you need a document to quote, this is what Cortex-A Series Programmers Guide (4.0) tells about differences between RISC and CISC architectures:
An ARM processor is a Reduced Instruction Set Computer (RISC)
processor.
Complex Instruction Set Computer (CISC) processors, ...
In Python, how do I determine if an object is iterable?
...urn isinstance(obj, Iterable)
The above has been recommended already earlier, but the general consensus has been that using iter() would be better:
def iterable(obj):
try:
iter(obj)
except Exception:
return False
else:
return True
We've used iter() in our cod...
How to update Python?
...would apply to updating from 64-bit Python-2.7.10 to 64-bit Python-2.7.11, ie: the same bit-version. While it is possible to install two different bit versions of Python together, it would require some hacking, so I'll save that exercise for the reader. If you don't want to hack, I suggest that if s...
How do multiple clients connect simultaneously to one port, say 80, on a server? [duplicate]
... the basics of how ports work. However, what I don't get is how multiple clients can simultaneously connect to say port 80. I know each client has a unique (for their machine) port. Does the server reply back from an available port to the client, and simply state the reply came from 80? How does thi...
Map vs Object in JavaScript
...Objects are similar to Maps in that both let you set keys to values,
retrieve those values, delete keys, and detect whether something is
stored at a key. Because of this, Objects have been used as Maps
historically; however, there are important differences between Objects
and Maps that make ...
How does having a dynamic variable affect performance?
...ly like this. (The actual code is quite a bit more complex; this is simplified for presentation purposes.)
class C
{
static DynamicCallSite FooCallSite;
void M()
{
object d1 = whatever;
object d2;
if (FooCallSite == null) FooCallSite = new DynamicCallSite();
...
Breadth First Vs Depth First
...erentiate between two different ways of walking a tree.
It is probably easiest just to exhibit the difference. Consider the tree:
A
/ \
B C
/ / \
D E F
A depth first traversal would visit the nodes in this order
A, B, D, C, E, F
Notice that you go all the way down one leg be...