大约有 2,500 项符合查询结果（耗时：0.0242秒） [XML]
Is “double hashing” a password less secure than just hashing it once?
...ny users on a server platform) can comfortably support PBKDF2 with between 60,000 and 120,000 iterations, or bcrypt with cost factor of 12 or 13.
More background
Read PKCS #5 for authoritative information on the role of salt and iterations in hashing. Even though PBKDF2 was meant for generating en...
SVG gradient using CSS
...Gradient id="MyGradient">
<stop offset="5%" stop-color="#F60" />
<stop offset="95%" stop-color="#FF6" />
</linearGradient>
</defs>
<rect width="100" height="50"/>
</svg>
...
Find the min/max element of an Array in JavaScript
...
jsperf.com/array-min-max-random/1 starting from 60 elements Math methods are breaking equal with while cycles, if array size is greater than 60, than Math methods wins. Larger the array - greater the Math methods overtake. ( for 100 elems Math.min/max is 10% faster, for 10...
How to 'minify' Javascript code
...35438/2450730
numbers
1000000000000
//same as
1e12
var oneDayInMS=1000*60*60*24;
//same as
var oneDayInMS=864e5;
var a=10;
a=1+a;
a=a*2;
//same as
a=++a*2;
Some nice articles/sites i found about bitwise/shorthand:
http://mudcu.be/journal/2011/11/bitwise-gems-and-other-optimizations/
http://...
Setting onClickListener for the Drawable right of an EditText [duplicate]
...ered Oct 30 '12 at 8:57
Hardik4560Hardik4560
3,02911 gold badge1616 silver badges2929 bronze badges
...
How to get the seconds since epoch from the time + date output of gmtime()?
...different from int(time.time()), but it is safe to use something like x % (60*60*24)
datetime — Basic date and time types:
Unlike the time module, the datetime module does not support leap seconds.
share
...
Convert Rows to columns using 'Pivot' in SQL Server
... 282),
(102, 2, 212),
(105, 2, 78),
(109, 2, 97),
(105, 3, 60),
(102, 3, 123),
(101, 3, 220),
(109, 3, 87);
If your values are known, then you will hard-code the query:
select *
from
(
select store, week, xCount
from yt
) src
pivot
(
sum(xcount)
for week in ([...
What is android:weightSum in android, and how does it work?
...s; wrap_content elements do not contribute to n.
E.g. when weightSum is 60, and there are 3 fill_parent elements, the weight multiplier is 20. The weight multiplier is the default value for e.g. layout_width if the attribute is absent.
Second, the maximum possible expansion of every element is c...
How to add texture to fill colors in ggplot2
...tion=position_dodge(.9), stat="identity", colour="black", size=.5, width=0.60)+
geom_bar(data=HighlightDataVert, position=position_dodge(.9), stat="identity", colour="black", size=.5, width=0.40)+
geom_bar(data=HighlightDataVert, position=position_dodge(.9), stat="identity", colour="black", si...
How can I extract a good quality JPEG image from a video file with ffmpeg?
...ion for more options involving image outputs.
To output a single image at ~60 seconds duration:
ffmpeg -ss 60 -i input.mp4 -qscale:v 4 -frames:v 1 output.jpg
This will work with any video input. See below if your input is MJPEG.
MJPEG
If your input is MJPEG (Motion JPEG) then the images can be ext...