大约有 48,000 项符合查询结果（耗时：0.0655秒） [XML]
What reason is there to use null instead of undefined in JavaScript?
I've been writing JavaScript for quite a long time now, and I have never had a reason to use null . It seems that undefined is always preferable and serves the same purpose programmatically. What are some practical reasons to use null instead of undefined ?
...
Fastest way to determine if record exists
...I'm not sure if an Index exists on this field, and my newbish SQL doesn't know how to find out. I am working with this DB from Java via JDBC and the database is remotely located in a colo somewhere. I've only been provided a "database summary" which just details which fields exist in each table, the...
Is there a CSS not equals selector?
...not() filter, but not all browsers fully support CSS3 yet, so be sure you know what you're doing which is now
supported by all major browsers (and has been for quite some time; this is an old answer...).
Example:
<input type="text" value="will be matched" />
<input type="text" value="wil...
Private and protected constructor in Scala
...m's Programming Scala. I don't have a PDF of Beginning Scala with me right now to check it out.
– Daniel C. Sobral
Nov 13 '09 at 18:53
...
Reading from text file until EOF repeats last line [duplicate]
...u carry on to the next iteration. x is still 30 from previous iteration. Now you read from the stream and you get EOF. x remains 30 and the ios::eofbit is raised. You output to stderr x (which is 30, just like in the previous iteration). Next you check for EOF in the loop condition, and this ti...
Vagrant ssh authentication failure
...config
Host default
HostName 127.0.0.1
User vagrant
Port 2222
UserKnownHostsFile /dev/null
StrictHostKeyChecking no
PasswordAuthentication no
IdentityFile C:/Users/konst/.vagrant.d/insecure_private_key
IdentitiesOnly yes
LogLevel FATAL
http://docs.vagrantup.com/v2/cli/ssh_config....
Are Javascript arrays sparse?
... actual array would be inefficient.
You'll have to ask someone with more knowledge about specific implementations to answer what excatly triggers the shift from dense to sparse, but your example should be perfectly safe. If you want to get a dense array, you should call the constructor with an expl...
Decreasing height of bootstrap 3.0 navbar
...
Ah, I see this post was edited (a lot!) and now indeed shows the right code. I also see the min-height setting I suggested in my post here that for some reason got a down-vote. It's very frustrating to get downvoted on an answer that is correct, on-topic and clear...
...
How to update bower.json with installed packages?
In my project I've installed bower components without save option. Now, I would like update to bower.json ?
6 Answers
...
How do I show a console output/window in a forms application?
...s that changing this mysterious Visual Studio setting does). Does anyone know how this works under the hood?
– uglycoyote
Aug 14 '18 at 22:45
|
...