大约有 15,471 项符合查询结果（耗时：0.0377秒） [XML]
Check if character is number?
...ou can use regexp like this:
function is_numeric(str){
return /^\d+$/.test(str);
}
share
|
improve this answer
|
follow
|
...
Finding the source code for built-in Python functions?
...y
Modules/_<module>.c (if there’s also a C accelerator module)
Lib/test/test_<module>.py
Doc/library/<module>.rst
For extension-only modules, the typical layout is:
Modules/<module>module.c
Lib/test/test_<module>.py
Doc/library/<module>.rst
For buil...
Can you target with css?
...ut CSS1-based
formatters must treat ‘BR’ specially.
Grant Wagner's tests show that there is no way to style BR as you can do with other elements. There is also a site online where you can test the results in your browser.
Update
pelms made some further investigations, and pointed out that...
NSUserDefaults removeObjectForKey vs. setObject:nil
...
Swift 3.0
The below answer is no longer the case when I tested this.
When set to nil the result is NSCFData being stored. Possibly an NSNull object reference, but I am not positive.
To completely remove a value for a key use UserDefaults.standard.removeObject(forKey: "YourDefaul...
List of Big-O for PHP functions
...ose who doubt that PHP array lookups are O(N), I've written a benchmark to test that (they are still effectively O(1) for most realistic values).
$tests = 1000000;
$max = 5000001;
for( $i = 1; $i <= $max; $i += 10000 ) {
//create lookup array
$array = array_fill( 0, $i, NULL );
...
Does Parallel.ForEach limit the number of active threads?
...a few hours I watched the Parallel library spin off over 8,000 threads. I tested using MaxDegreeOfParallelism and sure enough the 8000+ threads disappeared. I have tested it multiple times now with the same result.
– Jake Drew
Jun 24 '16 at 6:40
...
IE7 Z-Index Layering Issues
I've isolated a little test case of IE7's z-index bug, but don't know how to fix it.
I have been playing with z-index all day long.
...
How should I use git diff for long lines?
... line.
For example, instead of getting something like this:
diff --git a/test-file.txt b/test-file.txt
index 19e6adf..eb6bb81 100644
--- a/test-file.txt
+++ b/test-file.txt
@@ -1 +1 @@
-this is a short line
+this is a slightly longer line
You might get something like this:
diff --git a/test-fil...
how to disable DIV element and everything inside [duplicate]
...
Try this!
$("#test *").attr("disabled", "disabled").off('click');
I don't see you using jquery above, but you have it listed as a tag.
share
|
...
Is there a C# type for representing an integer Range?
... the range.</summary>
/// <param name="value">The value to test</param>
/// <returns>True if the value is inside Range, else false</returns>
public bool ContainsValue(T value)
{
return (this.Minimum.CompareTo(value) <= 0) && (value.Com...