mui中ajax请求如如何处理超时

mui.ajax({  
timeout:5000,//超时  
error:function(xhr,type,error){//回调  
if(type==='timeout'){  
}  
}  
});

我查看mui的api中没有这个呢？目前方法如下：

(function($) {  

                var wa = null;  

                //Ajax发起请求  
                var ajax_submit = function(uname, passwd) {  
                    wa = plus.nativeUI.showWaiting("登录中..");  
                    var url = "http://192.168.2.97:8080/Demo01/front/login.action";  
                    var data = {  
                        username:uname,  
                        password:passwd  
                    };  

                    console.log("请求地址是："+data.username);  

                    $.post(url, data, success_submit, "text");  

                };  

                var success_submit = function(response){  
                    if(wa!=null){  
                        wa.close();  
                    }  
                    response = JSON.stringify(response);  
                    alert(response);  
                    //alert(response.getElementsByTagName("string")[0].textContent);  

                };  

                document.getElementById("submit").addEventListener('tap', function() {  
                    var username = document.getElementById("username").value;  
                    var passwd = document.getElementById("passwd").value;  

                    ajax_submit(username, passwd);  
                });  

            })(mui);  

使用mui.ajax来请求post，直接的post方法未提供。