大约有 33,000 项符合查询结果（耗时：0.0654秒） [XML]
Why is “except: pass” a bad programming practice?
...me, the file exists). Now imagine we get a IsADirectoryError, or a PermissionError instead. In such cases, we probably do not want to continue; we could still apply our default configuration, but we later won’t be able to save the file. And it’s likely that the user meant to have a custom config...
Can you use if/else conditions in CSS?
... could do something along the line:
:root {
--main-bg-color: brown;
}
.one {
background-color: var(--main-bg-color);
}
.two {
background-color: black;
}
Finally, you can preprocess your stylesheet with your favourite server-side language. If you're using PHP, serve a style.css.php file,...
JavaScript checking for null vs. undefined and difference between == and ===
... (a == undefined) // but see note below
...but again, note that the last one is vague; it will also be true if a is null.
Now, despite the above, the usual way to check for those is to use the fact that they're falsey:
if (!a) {
// `a` is falsey, which includes `undefined` and `null`
//...
How does one unit test routes with Express?
...s:
describe('GET /users', function(){
it('respond with json', function(done){
request(app)
.get('/users')
.set('Accept', 'application/json')
.expect(200)
.end(function(err, res){
if (err) return done(err);
done()
});
})
});
Upside: you can tes...
Global variables in Javascript across multiple files
...est too. I had a similar problem, so I decided to test out 3 situations:
One HTML file, one external JS file... does it work at all - can functions communicate via a global var?
Two HTML files, one external JS file, one browser, two tabs: will they interfere via the global var?
One HTML file, open...
What is an application binary interface (ABI)?
...
One easy way to understand "ABI" is to compare it to "API".
You are already familiar with the concept of an API. If you want to use the features of, say, some library or your OS, you will program against an API. The API co...
Unique (non-repeating) random numbers in O(1)?
...mbinations from the same initial state, otherwise your output will only be one of N states.
– Seph
Dec 4 '11 at 8:13
|
show 17 more comments...
How to validate phone numbers using regex
I'm trying to put together a comprehensive regex to validate phone numbers. Ideally it would handle international formats, but it must handle US formats, including the following:
...
How does the Google “Did you mean?” Algorithm work?
...fer spell correction in every language.
Also this means if overnight everyone start to spell night as "nigth" google would suggest that word instead.
EDIT
@ThomasRutter: Douglas describe it as "statistical machine learning".
They know who correct the query, because they know which query comes...
Remove property for all objects in array
...forEach. As you mention prototype, prototype.js also has a shim.
delete is one of the worst "optimization killers". Using it often breaks the performances of your applications. You can't avoid it if you want to really remove a property but you often can either set the property to undefined or just b...