大约有 15,461 项符合查询结果（耗时：0.0212秒） [XML]
Objective-C: Property / instance variable in category
...gt;
static void *MyClassResultKey;
@implementation MyClass
- (NSString *)test {
NSString *result = objc_getAssociatedObject(self, &MyClassResultKey);
if (result == nil) {
// do a lot of stuff
result = ...;
objc_setAssociatedObject(self, &MyClassResultKey, result, OBJC_ASSOC...
JavaScript Regular Expression Email Validation [duplicate]
...attern =/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/;
return pattern.test(str); // returns a boolean
}
share
|
improve this answer
|
follow
|
...
What is a sensible way to layout a Go project [closed]
...uth/
oauth.go # package source
oauth_test.go # test source
Update July 2014: see "Structuring Applications in Go" from Ben Johnson
That article include tips like:
Separate your binary from your application
combining the main.go file and my app...
WebKit issues with event.layerX and event.layerY
I just noticed that I get tons of deprecated warnings in the latest (canary) build of Chrome.
9 Answers
...
How to assign the output of a Bash command to a variable? [duplicate]
...
In shell you assign to a variable without the dollar-sign:
TEST=`pwd`
echo $TEST
that's better (and can be nested) but is not as portable as the backtics:
TEST=$(pwd)
echo $TEST
Always remember: the dollar-sign is only used when reading a variable.
...
Can I set an opacity only to the background image of a div?
...
top: 0;
bottom: 0;
left: 0;
right: 0;
background: url(test.jpg) center center;
opacity: .4;
width: 100%;
height: 100%;
}
See test case on jsFiddle
:before and ::before pseudo-element
Another trick is to use the CSS 2.1 :before or CSS 3 ::before pseudo-elements. :...
How to remove leading zeros from alphanumeric text?
...$) negative lookahead ensures that not the entire string will be matched.
Test harness:
String[] in = {
"01234", // "[1234]"
"0001234a", // "[1234a]"
"101234", // "[101234]"
"000002829839", // "[2829839]"
"0", // "[0]"
"0000000", // "[...
Java NIO FileChannel versus FileOutputstream performance / usefulness
...s comparing these two methods. Here is the code I used, the file that I am testing with is around 350MB . Is it a good option to use NIO based classes for File I/O, if I am not looking at random access or other such advanced features?
...
How do I achieve the theoretical maximum of 4 FLOPs per cycle?
...doesn't have enough registers for this to compile well.
This code has been tested to work well on Visual Studio 2010/2012 and GCC 4.6.ICC 11 (Intel Compiler 11) surprisingly has trouble compiling it well.
These are for pre-FMA processors. In order to achieve peak FLOPS on Intel Haswell and AMD Bulld...
Returning from a finally block in Java
...
A simple Groovy Test:
public class Instance {
List<String> runningThreads = new ArrayList<String>()
void test(boolean returnInFinally) {
println "\ntest(returnInFinally: $returnInFinally)"
println "---------------...