大约有 3,300 项符合查询结果（耗时：0.0231秒） [XML]
Why can't variable names start with numbers?
...Apple;
the compiler will know it's a identifier right away when it meets letter 'A'.
However a variable like:
123apple;
compiler won't be able to decide if it's a number or identifier until it hits 'a', and it needs backtracking as a result.
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What's the difference between encoding and charset?
...ISO-8859-1” (also called as Latin1) the decimal code point value for the letter ‘é’ is 233. However, in ISO 8859-5, the same code point represents the Cyrillic character ‘щ’.
On the other hand, a single code point in the Unicode character set can actually be mapped to different byte sequ...
Make XAMPP/Apache serve file outside of htdocs [closed]
... I have several network drives on my PC which have been mapped to drive letters (e.g. X:\myfolder). When I use this method I get an "Access Forbidden" warning. Does this mean the Apache user doesn't have read access to the drive?
– harryg
May 20 '13 at 14:43...
Replace part of a string with another string
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Raw string allows to write R"(\$name)" instead of "\\$name".
– Jarod42
Jul 22 '16 at 12:30
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Programmatically access currency exchange rates [closed]
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another very great free and opensource link is this:
https://raw.github.com/currencybot/open-exchange-rates/master/latest.json
(I found about it here: http://josscrowcroft.github.com/open-exchange-rates/)
[Update]:
Open Exchange Rates project data has been moved away from GitHub.
It i...
Detect If Browser Tab Has Focus
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Cross Browser jQuery Solution! Raw available at GitHub
Fun & Easy to Use!
The following plugin will go through your standard test for various versions of IE, Chrome, Firefox, Safari, etc.. and establish your declared methods accordingly. It also dea...
Where am I? - Get country
...untry();
can also replace getCountry() with getISO3Country() to get a 3 letter ISO code for the country. This will get the country name:
String locale = context.getResources().getConfiguration().locale.getDisplayCountry();
This seems easier than the other methods and rely upon the localisatio...
Vim search and replace selected text
...choose other one (by changing h in the command above to another lower case letter) that you don't use.
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grep output to show only matching file
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Letter O Considered Harmful
– user234461
Jan 23 at 13:19
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How to use GROUP_CONCAT in a CONCAT in MySQL
...A's, you identify only the value. Or you can have one more colum, with the letter, which is even better.
Like this :
SELECT id,GROUP_CONCAT(DISTINCT(name)), GROUP_CONCAT(value SEPARATOR "|") FROM sample GROUP BY name
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