大约有 16,000 项符合查询结果（耗时：0.0170秒） [XML]
Double vs single quotes
I'm really new to Ruby and I'm trying to understand if there's a specific time when I should use "" vs '' .
8 Answers
...
Image inside div has extra space below the image
Why in the following code the height of the div is bigger than the height of the img ? There is a gap below the image, but it doesn't seems to be a padding/margin.
...
Map implementation with duplicate keys
...
You are searching for a multimap, and indeed both commons-collections and Guava have several implementations for that. Multimaps allow for multiple keys by maintaining a collection of values per key, i.e. you can put a single object into the map, but you retrieve a coll...
Convert php array to Javascript
...
Spudley's answer is fine.
Security Notice: The following should not be necessary any longer for you
If you don't have PHP 5.2 you can use something like this:
function js_str($s)
{
return '"' . addcslashes($s, "\0..\37\"\\") . '"';
}
function js_array($array)
{
$temp = array_map('...
Conditional formatting based on another cell's value
I'm using Google Sheets for a daily dashboard. What I need is to change the background color of cell B5 based on the value of another cell - C5. If C5 is greater than 80% then the background color is green but if it's below, it will be amber/red.
...
Java inner class and static nested class
What is the main difference between an inner class and a static nested class in Java? Does design / implementation play a role in choosing one of these?
...
The shortest possible output from git log containing author and date
...
git log --pretty=format:"%h%x09%an%x09%ad%x09%s"
did the job. This outputs:
fbc3503 mads Thu Dec 4 07:43:27 2008 +0000 show mobile if phone is null...
ec36490 jesper Wed Nov 26 05:41:37 2008 +0000 Cleanup after [942]: Using timezon
ae62afd tobias Tue Nov 25 21:42:55...
Determine if a function exists in bash
Currently I'm doing some unit tests which are executed from bash. Unit tests are initialized, executed and cleaned up in a bash script. This script usualy contains an init(), execute() and cleanup() functions. But they are not mandatory. I'd like to test if they are or are not defined.
...
Convert string to binary in python
I am in need of a way to get the binary representation of a string in python. e.g.
8 Answers
...
ORA-00979 not a group by expression
...
You must put all columns of the SELECT in the GROUP BY or use functions on them which compress the results to a single value (like MIN, MAX or SUM).
A simple example to understand why this happens: Imagine you have a database like this:
FOO BAR
0 A
0 B
and you run SELE...