大约有 9,000 项符合查询结果（耗时：0.0250秒） [XML]
“var” or no “var” in JavaScript's “for-in” loop?
What's the correct way to write a for-in loop in JavaScript? The browser doesn't issue a complaint about either of the two approaches I show here. First, there is this approach where the iteration variable x is explicitly declared:
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How to check if a string contains only digits in Java [duplicate]
In Java for String class there is a method called matches, how to use this method to check if my string is having only digits using regular expression. I tried with below examples, but both of them returned me false as result.
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Size of Matrix OpenCV
I know this might be very rudimentary, but I am new to OpenCV. Could you please tell me how to obtain the size of a matrix in OpenCV?. I googled and I am still searching, but if any of you know the answer, please help me.
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pg_config executable not found
I am having trouble installing psycopg2. I get the following error when I try to pip install psycopg2 :
43 Answers
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When should I make explicit use of the `this` pointer?
When should I explicitly write this->member in a method of
a class?
12 Answers
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What does the “+” (plus sign) CSS selector mean?
For example:
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ActiveRecord.find(array_of_ids), preserving order
When you do Something.find(array_of_ids) in Rails, the order of the resulting array does not depend on the order of array_of_ids .
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SQL Server Installation - What is the Installation Media Folder?
I am installing SQL Server 2008. I have installed .NET framework 3.5.
Then I got folder SQL Server 2008 and performed following steps-
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How to get current relative directory of your Makefile?
I have a several Makefiles in app specific directories like this:
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Read url to string in few lines of java code
I'm trying to find Java's equivalent to Groovy's:
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