大约有 32,000 项符合查询结果（耗时：0.0521秒） [XML]
How can I determine the direction of a jQuery scroll event?
...
Check current scrollTop vs previous scrollTop
var lastScrollTop = 0;
$(window).scroll(function(event){
var st = $(this).scrollTop();
if (st > lastScrollTop){
// downscroll code
} else {
// upscroll code
}
lastScrollT...
Can you “ignore” a file in Perforce?
...
community wiki
21 revs, 2 users 98%Colonel Panic
2
...
What is the difference between call and apply?
...ly. I can't tell you exactly why.
See jsPerf, http://jsperf.com/test-call-vs-apply/3
[UPDATE!]
Douglas Crockford mentions briefly the difference between the two, which may help explain the performance difference... http://youtu.be/ya4UHuXNygM?t=15m52s
Apply takes an array of arguments, while C...
Why start an ArrayList with an initial capacity?
...aranteed to run in O(1).
1000000 + 1000000 = 2000000 operations
Java vs C#
Java is as above, starting at 10 and increasing each resize at 50% + 1. C# starts at 4 and increases much more aggressively, doubling at each resize. The 1000000 adds example from above for C# uses 3097084 operations.
...
How do I get the path of the current executed file in Python?
...e not so small... might be a load immediate or something even faster for 0 vs a load global for _?) Debatable whether it's cleaner or easier to read or even more clever/obscure.
– ArtOfWarfare
Dec 22 '17 at 22:19
...
Why not use exceptions as regular flow of control?
...
|
edited Oct 27 '11 at 13:41
glmxndr
41k2727 gold badges8888 silver badges114114 bronze badges
...
How do you build a Singleton in Dart?
...are singleton patterns. It's really a question of syntax "new Singleton()" vs "singleton". I find the latter more clear. Dart's factory constructors are useful, but I don't think this is a good use case for them. I also think Dart's lazy initialisation is a great feature, which is underused. Also re...
Best way to serialize an NSData into a hexadeximal string
.... I profiled this with a 2MB file on my iPhone 5. Time comparison was 0.05 vs 12 seconds. Memory footprint is negligible with this method while the other method grew the heap to 70MBs!
- (NSString *) hexString
{
NSUInteger bytesCount = self.length;
if (bytesCount) {
const char *hexC...
tomcat - CATALINA_BASE and CATALINA_HOME variables
...
CATALINA_HOME vs CATALINA_BASE
If you're running multiple instances, then you need both variables, otherwise only CATALINA_HOME.
In other words: CATALINA_HOME is required and CATALINA_BASE is optional.
CATALINA_HOME represents the root ...
How to lazy load images in ListView in Android
...as an alternative. The two big differences I see are 1) in memory caching vs SD card and 2) the use of AsyncTasks instead of a thread pool. android-developers.blogspot.com/2010/07/…
– Richard
Oct 29 '10 at 20:39
...