#{茶男與藍牌}
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from http://dyn.com/web-browser-dns-caching-bad-thing/
The whole reason for caching DNS records is to reduce unnecessary DNS queries; many webservers don’t change their IP addresses all that often. Every DNS record that your operating system requests has what is called a “Time to Live” (TTL), which is a number (in seconds) that determines how long a particular
If you’re ever doing some AJAX stuff with a text-box input it’s possible that your Firebug will throw a very unusual error:
Error: [Exception… “‘Permission denied to get property XULElement.selectedIndex’ when calling method:
The problem lies in Firefox specifically and it’s autocomplete functionality. To fix it all you need to do [...]
Tag Name Example(s) Description Author <META NAME=”AUTHOR” CONTENT=”Tex Texin”> The author’s name. cache-control <META HTTP-EQUIV=”CACHE-CONTROL” CONTENT=”NO-CACHE”> HTTP 1.1. Allowed values = PUBLIC | PRIVATE | NO-CACHE | NO-STORE.
Public – may be cached in public shared caches
Private – may only be cached in private cache
no-Cache – may not be cached
from http://www.quirksmode.org/blog/archives/2005/09/xmlhttp_notes_r_2.html
As we all know an xmlhttp script requires the use of the readystatechange event. In theory, using the load event is also possible, but Explorer doesn’t support it on xmlhttp requests.
Both these events, and the readyState property, have a few odd quirks when used in an xmlhttp environment, though. [...]
Problem:
When doing AJAX call, IE will cache every AJAX call. Hence, url such as ‘/post.do’ will return the same thing and actually the AJAX request will not be sent after the first time.
Solution:
put AJAX url ‘/post.do’ with a time stamp as following:
jQuery.get(‘/post.do?ts=’+(new Date()).getTime());
from http://www.davidtan.org/tips-reduce-firefox-memory-cache-usage/
Sometimes I just feel that Firefox is such a memory hog. Once I start to open up a few extra tabs, it starts to slow down my whole system. Fortunately, you can do something about it. Here are simple tips [...]
Just discover that when coding the following into style sheet:
table { border-collapse: collapse; } th, td { position: relative; border: 1px solid #eee; }
In Firefox 3, top and right borders of each table cell will disappear.
In IE 7, borders could not collapse.
Don’t know why this happened, need to do a little [...]
Well known issus that IE6 can not display transparency for PNG picture. But now here comes the IFixPNG from http://jquery.khurshid.com/ifixpng.php. It’s really a perfect fix for this issue…
Generally, it is caused by the following situations:
img, iframe, and frame with src attribute which is blank or non found items. any request from non-secure (non https) source. any usage of ‘about:’ such as about:blank
Trouble shooting:
examine any src attribute of img, iframe and frame carefully
Solution:
change src attribute to ‘javascript:false;’ or [...]
Just a note of gears in Firefox which will help a great deal in facilitating your web development.
Firebug: very handy extension which will help in figuring out the CSS and Javascript bugs.
YSlow: Y(Why) slow? It’s a really a good name which will clearly identify the performance problems in your [...]
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