AJAX允许以异步的方式向Web服务器发出请求。这种方式就使客户端浏览器可以持续为用户提供内容和操作界面而不必等待服务器的响应。-AJAX allows a request to the Web server in an asynchronous manner. This way the client browser can continue to provide users with content and user interface without having to wait for a