大约有 42,000 项符合查询结果（耗时：0.0546秒） [XML]
What does the construct x = x || y mean?
I am debugging some JavaScript, and can't explain what this || does?
12 Answers
12
...
SQL Server NOLOCK and joins
Background: I have a performance-critical query I'd like to run and I don't care about dirty reads.
3 Answers
...
How to get equal width of input and select fields
On the form, I have one select and two input fields. These elements are vertically aligned. Unfortunately, I can't get equal width of these elements.
...
In-Place Radix Sort
...rt for DNA. It's written in D because that's the language that I use most and therefore am least likely to make silly mistakes in, but it could easily be translated to some other language. It's in-place but requires 2 * seq.length passes through the array.
void radixSort(string[] seqs, size_t base...
GitHub: Reopening a merged pull request
I've now fixed the bug and want to resubmit the pull request with 1 extra commit. Is there any way to reopen the pull request or update it, or do I have to create a new pull request, type out the description etc again? Gitorious has this feature and we've recently moved to GitHub.
...
Change type of varchar field to integer: “cannot be cast automatically to type integer”
I have a small table and a certain field contains the type " character varying ". I'm trying to change it to " Integer " but it gives an error that casting is not possible.
...
Why does my JavaScript code receive a “No 'Access-Control-Allow-Origin' header is present on the req
...tpRequest:
Regular web pages can use the XMLHttpRequest object to send and receive data from remote servers, but they're limited by the same origin policy. Extensions aren't so limited. An extension can talk to remote servers outside of its origin, as long as it first requests cross-origin permi...
How to add multiple font files for the same font?
...le , but I don't get one thing. I have separate files for bold , italic and bold + italic . How can I embed all three files in one @font-face rule? For example, if I have:
...
Eloquent Collection: Counting and Detect Empty
...hod_count
count($result) works because the Collection implements Countable and an internal count() method: http://laravel.com/api/4.2/Illuminate/Database/Eloquent/Collection.html#method_count
Bonus Information
The Collection and the Query Builder differences can be a bit confusing to newcomers of...
Which is more correct: … OR …
Are both <h1><a ...> ... </a></h1> and <a ...><h1> ... </h1></a> valid HTML, or is only one correct? If they are both correct, do they differ in meaning?
...