a2764fb8_ith_jQuery__A_Beginner_s_Guide__Setting
[Description] Set to true to cache the response from the server, or false to always make the request. A value of false also makes jQuery append a random timestamp parameter to the request, as it does with $.getScript(), to ensure the browser doesn't cache the response. [Default Value] true (false when used with the 'script' and 'jsonp' dataType setting) [Setting] 
cache
Ajax with jQuery: A Beginner's Guide
Setting