大约有 40,000 项符合查询结果（耗时：0.0749秒） [XML]
JavaScript by reference vs. by value [duplicate]
I'm looking for some good comprehensive reading material on when JavaScript passes something by value and when by reference and when modifying a passed item affects the value outside a function and when not. I'm also interested in when assigning to another variable is by reference vs. by value and ...
Repeat command automatically in Linux
Is it possible in Linux command line to have a command repeat every n seconds?
13 Answers
...
Providing a default value for an Optional in Swift?
...same as the type contained in the Optional. As it stands, type inferencing sets T based on the parameter given to getOrElse, and then fails at runtime if this does not match the Optional and the Optional is non-nil:
let x: Int?
let y = x.getOrElse(1.414) // y inferred as Double, assigned 1.414
le...
How to get current CPU and RAM usage in Python?
What's your preferred way of getting current system status (current CPU, RAM, free disk space, etc.) in Python? Bonus points for *nix and Windows platforms.
...
Can I save the window layout in Visual Studio 2010/2012/2013?
...
Yes, you can use the "Import and Export Settings Wizard" (found in the Tools menu) to export only the settings that relate to your current window layout to a file. Uncheck everything but "General Settings" > "Window Layouts", and save the file somewhere you'll b...
Convert SQLITE SQL dump file to POSTGRESQL
...
As usual, if you have foreign keys then you'll probably want to look into set constraints all deferred to avoid insert ordering problems, placing the command inside the BEGIN/COMMIT pair.
Thanks to Nicolas Riley for the boolean, blob, and constraints notes.
If you have ` on your code, as generated ...
Is there a standard way to list names of Python modules in a package?
...:
raise ImportError('Not a package: %r', package_name)
# Use a set because some may be both source and compiled.
return set([os.path.splitext(module)[0]
for module in os.listdir(pathname)
if module.endswith(MODULE_EXTENSIONS)])
...
Bash script prints “Command Not Found” on empty lines
...h, not installed, misspelled, or something similar.
One way is to place a set -x at the top of your script or run it with bash -x instead of just bash - this will output the lines before executing them and you usually just need to look at the command output immediately before the error to see what'...
Will the Garbage Collector call IDisposable.Dispose for me?
The .NET IDisposable Pattern implies that if you write a finalizer, and implement IDisposable, that your finalizer needs to explicitly call Dispose.
This is logical, and is what I've always done in the rare situations where a finalizer is warranted.
...
What are invalid characters in XML
...tes).
They're escaped using XML entities, in this case you want & for &.
Really, though, you should use a tool or library that writes XML for you and abstracts this kind of thing away for you so you don't have to worry about it.
...