Ajax异步加载数据注册提示效果代码示例

我们写一个Controller

    @RequestMapping("/a3")
    public String ajax3(String name,String pwd){
        String msg = "";
//模拟数据库中存在数据
        if (name!=null){
            if ("admin".equals(name)){
                msg = "OK";
            }else {
                msg = "用户名输入错误";
            }
        }
        if (pwd!=null){
            if ("123456".equals(pwd)){
                msg = "OK";
            }else {
                msg = "密码输入有误";
            }
        }
        return msg; //由于@RestController注解，将msg转成json格式返回
    }

前端页面 login.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>


    
    <script src="${pageContext.request.contextPath}/statics/js/jquery3.1.1.min.js"></script>
    <script>
        function a1(){
            $.post({
                url:"${pageContext.request.contextPath}/a3",
                data:{'name':$("#name").val()},success:function (data) {
                    if (data.toString()=='OK'){
                        $("#userInfo").css("color","green");
                    }else {
                        $("#userInfo").css("color","red");
                    }
                    $("#userInfo").html(data);
                }
            });
        }
        function a2(){
            $.post({
                url:"${pageContext.request.contextPath}/a3",
                data:{'pwd':$("#pwd").val()},
                success:function (data) {
                    if (data.toString()=='OK'){
                        $("#pwdInfo").css("color","green");
                    }else {
                        $("#pwdInfo").css("color","red");
                    }
                    $("#pwdInfo").html(data);
                }
            });
        }
    </script>



    用户名:
    


    密码:
    

测试一下效果，动态请求响应，局部刷新，就是如此！