大约有 44,000 项符合查询结果（耗时：0.0568秒） [XML]
When is del useful in python?
...ariable makes the intent clearer. Compare:
del foo
to
foo = None
I know in the case of del foo that the intent is to remove the variable from scope. It's not clear that foo = None is doing that. If somebody just assigned foo = None I might think it was dead code. But I instantly know what som...
How to check if a file is a valid image file?
...
excellent advice, now i just need to figure out what those numbers are. thanks :)
– Sujoy
May 20 '09 at 18:11
...
How do you remove all the options of a select box and then add one option and select it with jQuery?
... Wouldn't this create a memory leak? The option elements are now inaccessible but still allocated.
– Synetech
Mar 6 '19 at 19:57
add a comment
...
SQL MAX of multiple columns?
...M (VALUES (1,2), (5,3), (1,4)) as tableOfValues(columnName1, ColumnName2) Now you can understand why that sample query has AS value(v) in it. My final query looked like this: SELECT Max(currentValues) as Max FROM (VALUES (12), (25), (35)) AS allCurrents(currentValues) It will pick the max val...
Multiple Indexes vs Multi-Column Indexes
...n lost in the soon to be 3 years since I sorted out the original link from now over 4 years ago. I can tell you that the blog post has the correct title as was linked to by evilhomer, but it looks like the followup blogs in the series are no longer easily findable from that first post. You'll have t...
Handling applicationDidBecomeActive - “How can a view controller respond to the app becoming Active?
...Active)
}
The big change here is that instead of calling a #selector, we now call the var created above. This can eliminate situations where you get invalid selector crashes.
Finally, we remove the observer.
func removeObserver() {
NotificationCenter.default.removeObserver(self, name: .UIApp...
How can I trigger a JavaScript event click
...
UPDATE
This was an old answer. Nowadays you should just use click. For more advanced event firing, use dispatchEvent.
const body = document.body;
body.addEventListener('click', e => {
console.log('clicked body');
});
console.log('Using cl...
Laravel migration: unique key is too long, even if specified
...RT may not work.
sudo systemctl stop mysqld
sudo systemctl start mysqld
Now you have Laravel 5.x with UTF8 support.
share
|
improve this answer
|
follow
|
...
How can you speed up Eclipse?
...
By now, you can install openjdk-7, which is not that much different from Sun Java 7.
– Has QUIT--Anony-Mousse
Dec 7 '11 at 17:36
...
Deserializing JSON data to C# using JSON.NET
...
You still have 'magic strings', they now are just hidden by the use of dynamic!
– Ian Ringrose
Sep 30 '15 at 9:02
...