compatibility

Our application runs fine in IE7 and IE8. We use the X-UA-Compatible header to force the browser to use IE7 standards document mode. This is about which rendering engine will be used afai get the picture. In IE9 however there are a bunch of things which stopped working. In IE9 the document mode is IE7 standards, but the browser mode remains IE9. When I manually change the browser mode (using the developer tools) to IE7, all is fine again. Is there a way to programmatically force BROWSER MODE? It seems this is not possible. 来源： https://stackoverflow.com/questions/9735080/is-it-possible-to

I just learnt from Why do list comprehensions write to the loop variable, but generators don't? that List comprehensions also "leak" their loop variable into the surrounding scope . Python 2.7.6 (default, Jun 22 2015, 17:58:13) >>> x = 'before' >>> a = [x for x in (1, 2, 3)] >>> x 3 This bug is fixed in Python3. Python 3.4.3 (default, Oct 14 2015, 20:28:29) >>> x = 'before' >>> a = [x for x in (1, 2, 3)] >>> x 'before' What is the best way to make Python2 be compatible with Python3 at this point? The best way is usually to just not reuse variable names like that, but if you want something that

When I use an anonymous function ( but see also note below ) like : $f = function() use ($out) { echo $out; }; It produces an parse error on servers where PHP is older than 5.3.0 . My software needs to be compatible with unknown servers , but in the same time , I want also to use new functions, so I thought I will add some kind of a version check, if (o99_php_good() != true){ $f = function() use ($out) { echo $out; }; } where the o99_php_good() is simply function o99_php_good(){ // $ver= ( strnatcmp( phpversion(),'5.3.0' ) >= 0 )? true:false; $ver= ( version_compare(PHP_VERSION, '5.3.0') >= 0

From what I've read, Git seems to rely heavily on POSIX-specific features, causing compatibility problems on Windows. However, I don't understand specifically what POSIX features Git uses which cannot be replicated easily on Windows. Because of this issue, I've been very hesitant to start working with Git on my Windows computer. What POSIX features does Git use, and is this still an issue? How have projects like msysGit managed to circumvent these problems? Yes, Git does rely on a POSIX system, but be advised that POSIX specifies a lot of things : a shell environment (i.e. command line