是一个web版的例子：里面是ext4.0配合servlet的编程实例(后台管理的)。例子中有常用的控件：tree、grid、浮动窗口、tab、form(带验证码)等等。-Is a web version of the example: there is ext4.0 instance with the servlet programming (background management). There are examples of commonly used control: tree, grid, floating window, tab, form (with verification code) and so on.