大约有 23,000 项符合查询结果（耗时：0.0406秒） [XML]
The 3 different equals
...rmance reasons, they're wrong. So programmers are free to choose === or == based on logical reasons but not on performance reasons: there are different cases to prefer the one or the other and performance must not be taken into account at all.
– lucaferrario
Fe...
Better way to get type of a Javascript variable?
...
Remember kids, manipulating JavaScript base objects can lead to compatibility and other weird issues. Try to use this sparingly in both libraries and larger projects!
– Alexander Craggs
Oct 31 '16 at 20:47
...
How to write log to file
...efer f.Close()
log.SetOutput(f)
log.Println("This is a test log entry")
Based on the Go docs, os.Open() can't work for log.SetOutput, because it opens the file "for reading:"
func Open
func Open(name string) (file *File, err error) Open opens the named
file for reading. If successful, ...
Setting background-image using jQuery CSS property
...2
{
background-image: url(/another/image/url/there.jpg);
}
// in JS
// based on value of imageUrl, determine what class to remove and what class to add.
$('myOjbect').removeClass('bg1').addClass('bg2');
share
|...
Make a float only show two decimal places
...
I made a swift extension based on above answers
extension Float {
func round(decimalPlace:Int)->Float{
let format = NSString(format: "%%.%if", decimalPlace)
let string = NSString(format: format, self)
return Float(atof...
How to remove all characters after a specific character in python?
...
and btw, for completeness, the RE-based solution is 2.54 usec, i.e., way slower than either @Ayman's or @Ned's.
– Alex Martelli
May 24 '09 at 22:58
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grep a tab in UNIX
... about 30% slower than using grep -P. This might be trivial and irrelevant based on the use case, and awk may be better simply for readability and portability.
– theferrit32
Sep 12 '19 at 16:37
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Create an index on a huge MySQL production table without table locking
...If your using a version greater than 5.1 indices are created while the database is online. So not to worry you won't interrupt production system use."
This is ****FALSE**** (at least for MyISAM / InnoDB tables, which is what 99.999% of people out there use. Clustered Edition is different.)
Doing...
Serving static files with Sinatra
...oes extra stuff for you github.com/sinatra/sinatra/blob/master/lib/sinatra/base.rb#L351
– iain
Dec 10 '15 at 23:07
1
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Change the default editor for files opened in the terminal? (e.g. set it to TextEdit/Coda/Textmate)
... open uses Launch Services to determine the file type, mostly based on its extension. If the file has an unknown extension, it'll fail to open the file. Generally, your CLI editor should be something that assumes text files...
– Gordon Davisson
A...