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App Inventor 2开发简单计算器 - App Inventor 2 中文网 - 清泛IT论坛，有思想、有深度
...序执行过程、跟踪变量值的方法，可以帮我们找到原因。问题出在输入等号之后，此时： 前数=计算结果 后数=0 算符=“”接下来输入算符，由于算符=“”，因此执行点击算符过程的“如果...则”分支，第一行代码为【前数=后数...
Perform .join on value in array of objects
...ensions. You can do [x.name for x of users] (spec wiki.ecmascript.org/doku.php?id=harmony:array_comprehensions) . Worth mentioning that just like using map/reduce/filter isn't very 'pythonic' the other way probably holds in JavaScript. CoffeeScript is cool with them though coffeescript.org .
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Get the subdomain from a URL
...: Domain::PublicSuffix
Java: http://sourceforge.net/projects/publicsuffix/
PHP: php-domain-parser
C# / .NET: https://github.com/danesparza/domainname-parser
Python: http://pypi.python.org/pypi/publicsuffix
Ruby: domainatrix, public_suffix
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Why doesn't Internet Explorer 11 honour conditional comments even when emulating Internet Explorer 8
...orer 8 compatibility mode turned on contains the string 'MSIE 8.0', so:
(PHP example)
if (strpos($_SERVER['HTTP_USER_AGENT'],'MSIE 8.0') !== false) {
$head[] = sprintf('<link rel="stylesheet" href="ie8.css" />');
}
...
C++: what regex library should I use? [closed]
...+11 - Do the tutorial: http://www.codeguru.com/cpp/cpp/cpp_mfc/stl/article.php/c15339
Note:
At the time of writing the only c++11 regex library that I know works is the clang/llvm one, and only works on Mac. The GNU still doesn't implement regex yet. I don't know about Visual Studio. Most people st...
Laravel stylesheets and javascript don't load for non-base routes
... you need to use the "Blade templating engine". Blade files use the .blade.php extension.
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increment date by one month
...010-12-11');
$date->modify('+1 month');
See documentations :
http://php.net/manual/fr/datetime.modify.php
http://php.net/manual/fr/class.datetime.php
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call a static method inside a class?
...that a static method call is taking place.
$this::staticMethod();
Since PHP 5.3 you can use $var::method() to mean <class-of-$var>::; this is quite convenient, though the above use-case is still quite unconventional. So that brings us to the most common way of calling a static method:
self...
Difference between application/x-javascript and text/javascript content types
... question (which was later edited by someone) was specifically about JS in PHP - will it work as PHP/JS combo on all servers/browsers if I will omit it entirely ??
– Obmerk Kronen
Mar 12 '12 at 9:39
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PDO get the last ID inserted
...
That's because that's an SQL function, not PHP. You can use PDO::lastInsertId().
Like:
$stmt = $db->prepare("...");
$stmt->execute();
$id = $db->lastInsertId();
If you want to do it with SQL instead of the PDO API, you would do it like a normal select qu...