大约有 43,000 项符合查询结果（耗时：0.0471秒） [XML]
“INSERT IGNORE” vs “INSERT … ON DUPLICATE KEY UPDATE”
...
12 Answers
12
Active
...
Append value to empty vector in R?
...
212
Appending to an object in a for loop causes the entire object to be copied on every iteration, ...
How to flip background image using CSS?
... flip it horizontally with CSS...
a:visited {
-moz-transform: scaleX(-1);
-o-transform: scaleX(-1);
-webkit-transform: scaleX(-1);
transform: scaleX(-1);
filter: FlipH;
-ms-filter: "FlipH";
}
jsFiddle.
If you want to flip vertically instead...
a:visited {
-moz-transf...
Why do enum permissions often have 0, 1, 2, 4 values?
Why are people always using enum values like 0, 1, 2, 4, 8 and not 0, 1, 2, 3, 4 ?
7 Answers
...
Is 1.0 a valid output from std::generate_canonical?
I always thought random numbers would lie between zero and one, without 1 , i.e. they are numbers from the half-open interval [0,1). The documention on cppreference.com of std::generate_canonical confirms this.
...
Comparing numbers in Bash
...
931
In bash, you should do your check in arithmetic context:
if (( a > b )); then
...
fi
F...
PHP DateTime::modify adding and subtracting months
...
108
Why it's not a bug:
The current behavior is correct. The following happens internally:
+1 m...
Representing and solving a maze given an image
...
10 Answers
10
Active
...
What is the difference between UTF-8 and ISO-8859-1?
What is the difference between UTF-8 and ISO-8859-1 ?
8 Answers
8
...