大约有 40,000 项符合查询结果（耗时：0.0633秒） [XML]
Create, read, and erase cookies with jQuery [duplicate]
...'t specifically alluding to above, but when I include it in my Gemfile and application.js (immediately after //= require jQuery, as the installation instructions say to do), I get an error whenever I load the app about missing files. If I remember correctly, the error was something like "Sprockets::...
How do you crash a JVM?
...ught that you could do so by writing an infinite for-loop that would eventually use up all the memory.
27 Answers
...
Create a dictionary on a list with grouping
...vert it to a dictionary, as follows:
Dim qry = (From acs In ActualSales _
Group By acs.ProductID Into Group _
Select ProductID, Months = Group.ToDictionary(Function(c) c.Period) _
).ToDictionary(Function(c) c.ProductID)
The resulting query can be used as fo...
What is the X-REQUEST-ID http header?
...ates. If a client receives an error it can include the ID in a bug report, allowing the server operator to look up the corresponding log statements (without having to rely on timestamps, IPs, etc).
As this ID is generated (randomly) by the client it does not contain any sensitive information, and s...
Can you attach Amazon EBS to multiple instances?
... to get an EBS volume attached to more than one instance, it would be a _REALLY_BAD_IDEA_. To quote Kekoa, "this is like using a hard drive in two computers at once"
Why is this a bad idea? ...
The reason you can't attach a volume to more than one instance is that EBS provides a "block storage" a...
Rolling or sliding window iterator?
...nder why the default window size should be 2? Should it have a default at all?
– SingleNegationElimination
Jul 25 '11 at 22:02
19
...
What reason is there to use null instead of undefined in JavaScript?
...t undefined is always preferable and serves the same purpose programmatically. What are some practical reasons to use null instead of undefined ?
...
Distinct not working with LINQ to Objects
...
LINQ Distinct is not that smart when it comes to custom objects.
All it does is look at your list and see that it has two different objects (it doesn't care that they have the same values for the member fields).
One workaround is to implement the IEquatable interface as shown here.
If yo...
Drop data frame columns by name
...d like to remove from a data frame. I know that we can delete them individually using something like:
20 Answers
...
What's the advantage of a Java enum versus a class with public static final fields?
...ing to work more in Java. I expected to learn that enums in Java were basically equivalent to those in C# but apparently this is not the case. Initially I was excited to learn that Java enums could contain multiple pieces of data which seems very advantageous ( http://docs.oracle.com/javase/tutorial...