JS Check Login State method Encapsulation (closure, state cache)

Front-end page development, often need to asynchronously check the login state, each time to copy the previous method of writing, compared to the cumbersome maintenance, solid check the login state to a JS.

(function(){    //Login Status 1 Login valid 2 Invalid login State 3 Request timed out    varstatus; //Status expiry time stamp    varStatus_exprie_timestamp; //Default Time-out (in seconds)    varDefault_exprie_time = 60; //the qualified protocol name can only be HTTPS or HTTP    varLP = "https:" = = Document.location.protocol? ' https: ': ' http: '; //detecting whether to log in    //login_user_id User ID | session_id Session ID | Callback callback function after successful failure timeout    //Timeout time 5 seconds    functionCheck_login (login_user_id,session_id,callback) {//A status that is not expired and the status is not 3 (Request timed out) directly called callback does not update the expiration timestamp        if(Status &&!status_is_expire () && Status! = 3) {callback (status); return ; }        //format Judgment        if(!check_login_user_id (login_user_id) | |!check_session_id (session_id)) {EXEC (2, callback); return ; }        //build request-related variables        varAjax_url = lp+ '//host/xxx '; vardata = {            ' login_user_id ': login_user_id,' session_id ': session_id,' Onlyjson ': 0,            ' t ':NewDate (). GetTime ()}; //Request$.ajax ({type:"Get", Url:ajax_url, Data:data, timeout:5000, DataType:"Jsonp", Success:function(data) {if(data.rtn==0) {EXEC (1, callback); }Else{EXEC (2, callback); }}, Error:function(data, Error_type, XHR) {if(error_type== ' timeout ') {EXEC (3, callback); }Else{EXEC (2, callback);    }            }        }); }    //with Check_login but no need to preach login_user_id and session_id    functionEsay_check_login (callback) {varlogin_user_id =get_login_user_id (); varsession_id =get_session_id ();    Check_login (Login_user_id,session_id,callback); }    //determine the user ID format    functioncheck_login_user_id (login_user_id) {return/^[0-9]{4,}$/. Test (LOGIN_USER_ID); }    //determine the session ID format    functioncheck_session_id (session_id) {return/^[0-9a-fa-f]{20,40}$/. Test (session_id); }    //Get user ID    functionget_login_user_id () {return_get (' login_user_id ')? _get (' login_user_id '): GetCookie (' login_user_id ')); }    //Get session ID    functionget_session_id () {return_get (' session_id ')? _get (' session_id '): GetCookie (' session_id ')); }    //Gets the current timestamp (in seconds)    //add_sec selectable as the current timestamp (seconds) plus the corresponding number of seconds    functionGet_now_timestamp (add_sec) {vartimestamp = Date.parse (NewDate ())/1000;if(Add_sec &&!)IsNaN (add_sec)) {Timestamp+=parseint (ADD_SEC); }        returntimestamp; }    //determine whether the state timed out    functionStatus_is_expire () {varNow_timestamp =Get_now_timestamp (); returnStatus_exprie_timestamp && Now_timestamp>=status_exprie_timestamp?true:false; }    //Get query parameter method    function_get (name) {varReg =NewRegExp ("(^|&)" + name + "= ([^&]*) (&|$)"); varr = Window.location.search.substr (1). Match (REG); if(r!=NULL)returnUnescape (r[2]);return NULL; }    //setting the state, time-out, and invoking the callback function    functionEXEC (_status,callback) {status=_status; Status_exprie_timestamp=Get_now_timestamp (default_exprie_time);    Callback (status); }    //gets the cookie for the specified name    functionGetCookie (name) {varArr=document.cookie.split ('; ‘); if(!arr)return false;  for(vari=0;i<arr.length;i++){             varOne=arr[i].split (' = ')); if(One[0]==name)returnOne[1]; }         return false; }    //throw variables, methodsWindow.check_login =Check_login; Window.esay_check_login=Esay_check_login; Window. LOGIN_SUCC= 1; Window. Login_fail= 2; Window. Login_timeout= 3;}) ();

Calling methods

Check_login (login_user_id,session_id,function(status) {if(status = = Login _SUCC) {//xxx}elseif(status = = login_fail) {//  XXX}elseif(status = = login_timeout) {//xxx}});

JS Check Login State method Encapsulation (closure, state cache)