结果这段代码在firefox中生效，在opera中也生效，但是在Safari和chrome中却没有效果，于是我上jQuery的官方论坛，和StackFlowover 论坛提问，后者有人回复我： I assure you I was using $.ajax with Chrome just five hours ago at the office, and had no such problem. I also imagine they use it here on SO and I have no problems here. I have no problems on jQueryUI in Chrome. I think it is your code. 大意就是斩钉截铁的说他用起来没有问题，是我自己的问题，我也纳闷了，后面也有人给我的建议更复杂：
You should use chrome's or safari's built-in developer tools (ctrl+shift+i) to track JS errors and track actual AJAX requests.
Is your code wrapped in document.ready? Is there any erros in javascript console? Also try to output something after success callback line. Another cause for this could be incorrect mime-type for your XML file returned by server. It should be [Content-type: text/xml]. You can check that in chrome's or safari's built-in developer tools - just look for headers tab when xml resource is selected. If it 's actual problem, you may need to tweak web-server configuration (main config or .htaccess for apache) to return correct mime-type
