大约有 15,208 项符合查询结果（耗时：0.0260秒） [XML]
The cause of “bad magic number” error when loading a workspace and how to avoid it?
...
I got that error when I accidentally used load() instead of source() or readRDS().
share
|
improve this answer
|
follow
|
...
jQuery to retrieve and set selected option value of html select element
...he id's are correct and your dom validates then the following applies:
To Read Select Option Value
$('#selectId').val();
To Set Select Option Value
$('#selectId').val('newValue');
To Read Selected Text
$('#selectId>option:selected').text();
...
What's the safest way to iterate through the keys of a Perl hash?
...t suited to your needs.
If you just want the keys and do not plan to ever read any of the values, use keys():
foreach my $key (keys %hash) { ... }
If you just want the values, use values():
foreach my $val (values %hash) { ... }
If you need the keys and the values, use each():
keys %hash; # ...
Why is Multiple Inheritance not allowed in Java or C#?
...languages while providing too little benefit.
For a more fun and in-depth read, there are some articles available on the web with interviews of some of the language designers. For example, for .NET, Chris Brumme (who worked at MS on the CLR) has explained the reasons why they decided not to:
...
Resize a large bitmap file to scaled output file on Android
...
Makes it hard to read when you use variables like "b" but good answer non the less.
– Oliver Dixon
Aug 14 '12 at 10:05
...
Immutability of Strings in Java
...
have you perchance every tried to program in C? Just read the primer on pointers and you'll understand coobird's answer perfectly.
– Ryan Fernandes
Oct 12 '09 at 2:58
...
What's the point of const pointers?
... If I were designing a new language, declared objects would be read-only ("const") by default. You'd need some special syntax, perhaps a "var" keyword, to make an object writable.
– Keith Thompson
Oct 12 '11 at 1:57
...
Difference between scaling horizontally and vertically for databases [closed]
...ata resides on a single node and scaling is done through multi-core i.e. spreading the load between the CPU and RAM resources of that machine.
With horizontal-scaling it is often easier to scale dynamically by adding more machines into the existing pool - Vertical-scaling is often limited to the cap...
How to prevent SIGPIPEs (or handle them properly)
...all server program that accepts connections on a TCP or local UNIX socket, reads a simple command and, depending on the command, sends a reply. The problem is that the client may have no interest in the answer sometimes and exits early, so writing to that socket will cause a SIGPIPE and make my serv...
Convert pem key to ssh-rsa format
... You can do the same with ssh-keygen:
ssh-keygen -f pub1key.pub -i
will read the public key in openssl format from pub1key.pub and output it in OpenSSH format.
Note: In some cases you will need to specify the input format:
ssh-keygen -f pub1key.pub -i -mPKCS8
From the ssh-keygen docs (From ma...