eb 应用开发者必须面对的问题。有多种方法可以用来解决这个问题，如使用 Cookies 、隐藏的表单输入域，或直接将状态信息附加到 URL 中-web application developers have to face problems. There are several ways to solve this problem, such as the use of Cookies, hidden form input field, or directly to the additional