大约有 45,000 项符合查询结果（耗时：0.0983秒） [XML]
What is href=“#” and why is it used?
On many websites I see links that have href="#" . What does it mean? What is it used for?
9 Answers
...
What is the difference between a definition and a declaration?
...
A declaration introduces an identifier and describes its type, be it a type, object, or function. A declaration is what the compiler needs to accept references to that identifier. These are declarations:
extern int bar;
extern int g(int, int);
double f(int, double); // extern...
Simulator or Emulator? What is the difference?
...ece of software that mimics existing hardware/software, what should I call it? A simulator or an emulator?
21 Answers
...
Is it better to reuse a StringBuilder in a loop?
...uilder.
In a very long loop I'm manipulating a StringBuilder and passing it to another method like this:
14 Answers
...
What does if __name__ == “__main__”: do?
...
Whenever the Python interpreter reads a source file, it does two things:
it sets a few special variables like __name__, and then
it executes all of the code found in the file.
Let's see how this works and how it relates to your question about the __name__ checks we always s...
What is Lazy Loading?
...
It's called lazy loading because, like a lazy person, you are putting off doing something you don't want to. The opposite is Eager Loading, where you load something right away, long before you need it.
If you are curious wh...
In a PHP project, what patterns exist to store, access and organize helper objects? [closed]
...h suggested by Flavius. There are numerous reasons to avoid this approach. It violates good OOP principles. The google testing blog has some good articles on the Singleton and how to avoid it:
http://googletesting.blogspot.com/2008/08/by-miko-hevery-so-you-join-new-project.html
http://googletesting...
Is null an Object?
...
If null were an Object, it would support the methods of java.lang.Object such as equals(). However, this is not the case - any method invocation on a null results in a NullPointerException.
And this is what the Java Language Specification has to sa...
When would I need a SecureString in .NET?
...uld stop using SecureString . Looks like PG guys are dropping support for it. Possibly even pull it in the future - https://github.com/dotnet/apireviews/tree/master/2015-07-14-securestring .
We should remove encryption from SecureString across all platforms in .NET Core - We should obsolete ...
Can you have multiline HTML5 placeholder text in a ?
...lue is the empty string and the control is not focused (e.g. by displaying it inside a blank unfocused control). All U+000D CARRIAGE RETURN U+000A LINE FEED character pairs (CRLF) in the hint, as well as all other U+000D CARRIAGE RETURN (CR) and U+000A LINE FEED (LF) characters in the hint, must be ...