今天晚自习自学了ajax。学了2个小时，终于是学到了一点皮毛。原本网页跳转servlet处理数据，servlet把处理完的数据返回到jsp网页，这个过程需要重定向等刷新页面的方式处理。ajax就是省去了刷新一步骤。效果还是需要跳转要处理的页面，可以传值，也有返回之后的处理。例子： 前端ajax代码：<script type="text/javascript" src="js/jquery-1.12.4.js"></script><script type="text/javascript">function as(){$.ajax({type:"get",url:"<%=basePath%>ajx",data:{"txt":$("#txt").val()},success:function(resq){$("#show").text(resq);}})；};</script><input type="text" name="txt" value="世修" id="txt" onblur="as()" /><span id="show"></span>后端servlet代码：protected void doGet(HttpServletRequest req, HttpServletResponse resp)throws ServletException, IOException {String txt=req.getParameter("txt");req.setCharacterEncoding("utf-8");resp.setCharacterEncoding("utf-8");if("世修".equals(txt)){resp.getWriter().print("正确");}else{ resp.getWriter().print("错误");}}protected void doPost(HttpServletRequest req, HttpServletResponse resp)throws ServletException, IOException {this.doGet(req, resp);}