2530:   // Last-Modified header cache for next request
2531:   lastModified: {},
2532: 
2533:   ajax: function( s ) {
2534:     var jsonp, jsre = /=\?(&|$)/g, status, data;
2535: 
2536:     // Extend the settings, but re-extend 's' so that it can be
2537:     // checked again later (in the test suite, specifically)
2538:     s = jQuery.extend(true, s, jQuery.extend(true, {}, jQuery.ajaxSettings, s));
2539: 
2540:     // convert data if not already a string
2541:     if ( s.data && s.processData && typeof s.data != "string" )
2542:       s.data = jQuery.param(s.data);
2543: 

2544:     // Handle JSONP Parameter Callbacks
2545:     if ( s.dataType == "jsonp" ) {
2546:       if ( s.type.toLowerCase() == "get" ) {
2547:         if ( !s.url.match(jsre) )
2548:           s.url += (s.url.match(/\?/) ? "&" : "?") + (s.jsonp || "callback") + "=?";
2549:       } else if ( !s.data || !s.data.match(jsre) )
2550:         s.data = (s.data ? s.data + "&" : "") + (s.jsonp || "callback") + "=?";
2551:       s.dataType = "json";
2552:     }
2553: 
2554:     // Build temporary JSONP function
2555:     if ( s.dataType == "json" && (s.data && s.data.match(jsre) || s.url.match(jsre)) ) {
2556:       jsonp = "jsonp" + jsc++;
2557: 
2558:       // Replace the =? sequence both in the query string and the data
2559:       if ( s.data )
2560:         s.data = (s.data + "").replace(jsre, "=" + jsonp + "$1");
2561:       s.url = s.url.replace(jsre, "=" + jsonp + "$1");
2562: 
2563:       // We need to make sure
2564:       // that a JSONP style response is executed properly
2565:       s.dataType = "script";
2566: 
2567:       // Handle JSONP-style loading
2568:       window[ jsonp ] = function(tmp){
2569:         data = tmp;
2570:         success();
2571:         complete();
2572:         // Garbage collect
2573:         window[ jsonp ] = undefined;
2574:         try{ delete window[ jsonp ]; } catch(e){}
2575:         if ( head )
2576:           head.removeChild( script );
2577:       };
2578:     }
2579: 

2580:     if ( s.dataType == "script" && s.cache == null )
2581:       s.cache = false;
2582: 
2583:     if ( s.cache === false && s.type.toLowerCase() == "get" ) {
2584:       var ts = (new Date()).getTime();
2585:       // try replacing _= if it is there
2586:       var ret = s.url.replace(/(\?|&)_=.*?(&|$)/, "$1_=" + ts + "$2");
2587:       // if nothing was replaced, add timestamp to the end
2588:       s.url = ret + ((ret == s.url) ? (s.url.match(/\?/) ? "&" : "?") + "_=" + ts : "");
2589:     }
2590: