大约有 47,000 项符合查询结果（耗时：0.0699秒） [XML]
How to reload apache configuration for a site without restarting apache
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olly_ukolly_uk
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MySQL DISTINCT on a GROUP_CONCAT()
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edited Jun 21 '10 at 9:47
Daniel Vassallo
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Rails ActionMailer - format sender and recipient name/email address
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edited Nov 16 '16 at 0:03
Jonathan Allard
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a...
Is there a difference between /\s/g and /\s+/g?
...g replaced with the empty string because of the +.
However, just like how 0 multiplied by anything else is 0, it seems as if both methods strip spaces in exactly the same way.
If you change the replacement string to '#', the difference becomes much clearer:
var str = ' A B C D EF ';
console.l...
What is the use of style=“clear:both”?
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edited Jul 14 '09 at 20:46
answered Jun 18 '09 at 11:23
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What does a double * (splat) operator do
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Ruby 2.0 introduced keyword arguments, and ** acts like *, but for keyword arguments. It returns a Hash with key / value pairs.
For this code:
def foo(a, *b, **c)
[a, b, c]
end
Here's a demo:
> foo 10
=> [10, [], {}]
&g...
How does grep run so fast?
...omparison
# (everything is in the buffer cache)
$ time grep -c 'tg=f_c' 20140910.log
28
0.168u 0.068s 0:00.26
$ time grep -c ' /cc/merchant.json tg=f_c' 20140910.log
28
0.100u 0.056s 0:00.17
The longer form is 35% faster!
How come? Boyer-Moore consructs a skip-forward table from the pattern-st...
Android: How to enable/disable option menu item on button click?
...example_foobar).setEnabled(false);
}
return true;
}
On Android 3.0 and higher, the options menu is considered to always be open when menu items are presented in the action bar. When an event occurs and you want to perform a menu update, you must call invalidateOptionsMenu() to request that...
How do I make this file.sh executable via double click?
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edited Mar 10 '12 at 21:16
answered Mar 10 '12 at 21:09
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How to style a JSON block in Github Wiki?
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edited Feb 15 '13 at 20:50
answered Feb 15 '13 at 19:24
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