解决拦截器对ajax请求的的拦截

public boolean preHandle(HttpServletRequest request, HttpServletResponse response,  obj) throws Exception {                //获取判定登陆的session是否存在        String token = (String) request.getSession().getAttribute("token");        String postId = (String) request.getSession().getAttribute("postId");        if(token == null || token == ""){            String XRequested =request.getHeader("X-Requested-With");            if(" HttpRequest".equals(XRequested)){                response.getWriter().write("IsAjax");            }else{                response.sendRedirect("/m-web/user/toLogin");            }            return false;        }        if(postId == null || postId == ""){            String XRequested =request.getHeader("X-Requested-With");            if(" HttpRequest".equals(XRequested)){                response.getWriter().write("IsAjax");            }else{                response.sendRedirect("/m-web/user/toLogin");            }            return false;        }        return true;    }

success:function(data){    if(data == "IsAjax"){        window.location.href="m-web/user/toLogin"        return;    }}

　　　　　　if ( isSuccess ) {// if no content                if ( status === 204 || s.type === "HEAD" ) {                    statusText = "nocontent";                // if not modified                } else if ( status === 304 ) {                    statusText = "notmodified";                // If we have data, let's convert it                } else {                    statusText = response.state;                    success = response.data;                    error = response.error;                    isSuccess = !error;                    //解决ajax拦截问题                    var result = responses.text;                    if(result.indexOf("IsAjax")>=0){                        window.location.href="m-web/user/toLogin";                        return;                    }                }            }