The simplest format for this kind of image is an animated GIFfile. The exact image can be anything you like, as long as it featuresa smoothly looping animation. Rotating shapes, spinningarrows, and barbershop-pole progress bars are all popular conventionsfor indicating activity.Here’s a short functi
Ajax请求一、什么是Ajax二、Ajax原理是什么三、Ajax的使用1.创建Ajax核心对象XMLHttpRequest(记得考虑兼容性)2.向服务器发送请求3.服务器响应处理（区分同步跟异步两种情况）①同步处理②异步处理③GET和POST请求数据区别四、结束语五、jQuery的ajax函数1、参数详解2、使用样例 AJAX即“Asynchronous Javascript And XML”，
