大约有 45,000 项符合查询结果（耗时：0.0359秒） [XML]
Getting a random value from a JavaScript array
...s to performance optimization while producing output using UI elements, ~~ wins the game. MORE INFO
var rand = myArray[~~(Math.random() * myArray.length)];
But if you know that the array is going to have millions of elements than you might want to reconsider between Bitwise Operator and Math.Floor(...
Resolve build errors due to circular dependency amongst classes
...ut upfront - pointers and references, for example, will always be 32 or 64 bits (depending on the architecture) and so if you replaced (either one) by a pointer or reference, things would be great. Let's say we replace in A:
// file: A.h
class A {
// both these are fine, so are various const vers...
Windows 8.1 / Windows 10 breaks my ASP.NET / IIS : “Service unavailable”
With Windows 8.1 finally released to MSDN/Technet today I came across the following issue running my ASP.NET application after doing an in place upgrade with Win 8.1 RTM:
...
Is it possible to have multiple statements in a python lambda expression?
...
BrianBrian
102k2828 gold badges9999 silver badges108108 bronze badges
...
Calculate size of Object in Java [duplicate]
...et a reference to the sun.misc.Unsafe object.
private static final int NR_BITS = Integer.valueOf(System.getProperty("sun.arch.data.model"));
private static final int BYTE = 8;
private static final int WORD = NR_BITS/BYTE;
private static final int MIN_SIZE = 16;
public static int sizeOf(Class src)...
“unrecognized import path” with go get
...'t hit /usr/local/go/bin. Also, should note that the ubuntu packages are a bit behind the official release, which is 1.2.
– JimB
Dec 9 '13 at 15:08
2
...
Measuring elapsed time with the Time module
...me unit with gmtime is seconds. If you need microseconds consider the following:
import datetime
start = datetime.datetime.now()
# some code
end = datetime.datetime.now()
elapsed = end - start
print(elapsed)
# or
print(elapsed.seconds,":",elapsed.microseconds)
strftime documentation
...
configure Git to accept a particular self-signed server certificate for a particular https remote
...tton I got exactly the same file, as created using openssl.
Note: I was a bit surprised, there is no name of the authority visibly mentioned. This is fine.
Having the trusted certificate in dedicated file
Previous steps shall result in having the certificate in some file. It does not matter, what...
Is floating-point math consistent in C#? Can it be?
...nd this rather hard to do. For some operations intermediate integers of 128bit would be useful. But .net doesn't offer such a type.
Implement a custom 32 bit floatingpoint. The lack of a BitScanReverse intrinsic causes a few annoyances when implementing this. But currently I think this is the most p...
Should I use #define, enum or const?
...disadvantages of a single approach. I work in embedded systems so the following solution is based on the fact that integer and bitwise operators are fast, low memory & low in flash usage.
Place the enum in a namespace to prevent the constants from polluting the global namespace.
namespace Reco...