大约有 45,000 项符合查询结果（耗时：0.0677秒） [XML]
How to check if array is empty or does not exist? [duplicate]
...for undefined first. If you do it the other way round, it will generate an error if the array is undefined.
if (array === undefined || array.length == 0) {
// array empty or does not exist
}
Update
This answer is getting a fair amount of attention, so I'd like to point out that my original answ...
Loop backwards using indices in Python?
...
yes, PEP-322 gives us a clear and least error-prone way to reverse iterations.
– Allen Shen
Jul 31 '19 at 20:25
1
...
Manipulating an Access database from Java without ODBC
...class was stuck with this issue believing it to be a file system privilege error. Helped me loads and it took a surprising amount of digging to realize Oracle done away with the JDBC-ODBC bridge from Java 8.
– wilbomc
Jan 22 '15 at 1:23
...
deny directory listing with htaccess
...
For showing Forbidden error then include these lines in your .htaccess file:
Options -Indexes
If we want to index our files and showing them with some information, then use:
IndexOptions -FancyIndexing
If we want for some particular extensi...
Why do pthreads’ condition variable functions require a mutex?
...
no, error handling is second to this. With pthreads, you can be woken up, for no apparent reason(a spurious wakeup) , and with out any error. Thus you need to recheck 'some condition' after you're woken up.
–...
How to subtract date/time in JavaScript? [duplicate]
...
in TypeScript I get a tslint error when I try to do this: var diff = Math.abs(new Date() - compareDate);
– Devid
Sep 16 '17 at 10:32
...
accepting HTTPS connections with self-signed certificates
... return sf;
} catch (Exception e) {
throw new AssertionError(e);
}
}
}
We have created our custom HttpClient, now we can use it for secure connections. For example when we make a GET call to a REST resource:
// Instantiate the custom HttpClient
DefaultHttpClient clie...
What is memory fragmentation?
...typical scenarios. This results in out of memory exceptions, or allocation errors (i.e. malloc returns null).
The easiest way to think about this is to imagine you have a big empty wall that you need to put pictures of varying sizes on. Each picture takes up a certain size and you obviously can't s...
Laravel Pagination links not including other GET parameters
... This worked for laravel 5.6, using the accepted answer solution caused an error for me.
– Muhmmad Aziz
Aug 26 '18 at 7:19
1
...
JavaScript displaying a float to 2 decimal places
...te value with jquery from an element, if I use only toFixed it produces an error. parseFloat fixes it.
– panos
Jan 13 '16 at 11:36
2
...