大约有 45,000 项符合查询结果（耗时：0.0511秒） [XML]
How can I add new array elements at the beginning of an array in Javascript?
...
12 Answers
12
Active
...
Bootstrap 3: pull-right for col-lg only
...
You could put "element 2" in a smaller column (ie: col-2) and then use push on larger screens only:
<div class="row">
<div class="col-lg-6 col-xs-6">elements 1</div>
<div class="col-lg-6 col-xs-6">
<div cla...
How to show line number when executing bash script
...or example, if your script reads:
$ cat script
foo=10
echo ${foo}
echo $((2 + 2))
Executing it thus would print line numbers:
$ PS4='Line ${LINENO}: ' bash -x script
Line 1: foo=10
Line 2: echo 10
10
Line 3: echo 4
4
http://wiki.bash-hackers.org/scripting/debuggingtips gives the ultimate PS4 t...
Pan & Zoom Image
...(ScaleTransform)image.RenderTransform;
double zoom = e.Delta > 0 ? .2 : -.2;
st.ScaleX += zoom;
st.ScaleY += zoom;
}
To handle the panning the first thing I did was to handle the MouseLeftButtonDown event on the image, to capture the mouse and to record it's location, I also store t...
How do I find the caller of a method using stacktrace or reflection?
...
12 Answers
12
Active
...
How to remove an element from an array in Swift
....g:
var animals = ["cats", "dogs", "chimps", "moose"]
animals.remove(at: 2) //["cats", "dogs", "moose"]
A non-mutating alternative that will keep the original collection unchanged is to use filter to create a new collection without the elements you want removed, e.g:
let pets = animals.filter ...
How do you round a floating point number in Perl?
...ntf() or printf() is usually the easiest
route.
printf("%.3f", 3.1415926535); # prints 3.142
The POSIX module (part of the standard Perl distribution) implements
ceil(), floor(), and a number of other mathematical and trigonometric
functions.
use POSIX;
$ceil = ceil(3.5); ...
How to return an empty ActiveRecord relation?
... |
edited Nov 9 '16 at 2:25
Patrick Brinich-Langlois
1,2301414 silver badges2626 bronze badges
answer...
How to check if AlarmManager already has an alarm set?
...
325
Following up on the comment ron posted, here is the detailed solution. Let's say you have regi...