JQuery JSON fetch function with cache support ($.getJSONCache)

jquery.jsonCache.js

/**
 * Uses localStorage for cache and if misses
 * uses getJSON to get content
 */
$.getJSONCache=function(url,data,success){
  data = data || {}
  var key = url + '?' + $.param(data);
  var value = localStorage.getItem(key);
  if(value)
  {
	data = JSON.parse(value);
	if($.isFunction(success))
		success(data);
  }
  else{
	$.getJSON(url,data,function(data){
		localStorage.setItem(key,JSON.stringify(data));
		if($.isFunction(success))
			success.apply(this,[data]);
	});
  }
}