大约有 15,461 项符合查询结果（耗时：0.0340秒） [XML]
How to tell if a JavaScript function is defined
...ttering my code than absolutely needed; therefore, this isn't my ideal for testing if something is a function.
– Jason Bunting
Sep 13 '10 at 21:10
4
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Get IP address of visitors using Flask for Python
...mes you're not behind a reverse proxy, then this should be preferred. (I'd test this if I could easily set up a reverse proxy, but that would take more time than I have at the moment.)
– jpmc26
Aug 1 '14 at 23:32
...
In an array of objects, fastest way to find the index of an object whose attributes match a search
...nexpected type conversion, so use the obj.id === 3 operator instead, which tests for equal value and type.
– thclark
Jul 3 '18 at 13:03
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How to disable HTML button using JavaScript?
...emonstrates how shadowing works:
var input = document.querySelector('#test');
// the attribute works as expected
console.log('old attribute:', input.getAttribute('value'));
// the property is equal to the attribute when the property is not explicitly set
console.log('old property:', input...
How to print last two columns using awk
...viors have been (maybe erroneously) brought forward. I do not have gawk to test against -- which is probably what you are referencing. So I don't know for sure why your comment came abnput. Linux awk out of the box usually is gawk. I will test and post back. Meanwhile try Soalris or HPUX or DGX or ...
Remove NA values from a vector
...ively slower (though I'll happily take comments on my implementation & test!)
microbenchmark::microbenchmark(
purrr::map(airquality,function(x) {x[!is.na(x)]}),
purrr::map(airquality,na.omit),
purrr::map(airquality, ~purrr::discard(.x, .p = is.na)),
times = 1e6)
Unit: microseconds
...
Call An Asynchronous Javascript Function Synchronously
...e new to javascript. So it's currently not implemented by most browsers. I tested it in firefox, and for me it is nice way to wrap asynchronous function.
Here is example code from project GitHub
var { Deferred } = task;
spawn(function() {
out.innerHTML = "reading...\n";
try {
var ...
jQuery - setting the selected value of a select control via its text description
...
I haven't tested this, but this might work for you.
$("select#my-select option")
.each(function() { this.selected = (this.text == myVal); });
share
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How to use performSelector:withObject:afterDelay: with primitive types in Cocoa?
...e 0 or 1. It is true that most code won't care and will simply do an if () test on it, but it is conceivable that some code will depend on it being 0 or 1, and thus won't treat some large address value as being the same as 1 (YES).
– user102008
Oct 21 '11 at 22...
Downloading images with node.js [closed]
...ngth:', res.headers['content-length']);
request(uri).pipe(fs.createWriteStream(filename)).on('close', callback);
});
};
download('https://www.google.com/images/srpr/logo3w.png', 'google.png', function(){
console.log('done');
});
...