The javascript-Ajax request enters error. how can this problem be solved?

{Code ...}

$. Ajax ({url: rootPath + "/doRegister", type: "post", data: dates, contentType: "application/x-www-form-urlencoded; charset = UTF-8 ", timeout: 30000, dataType: "json", cache: false, error: function (e) {console. log (4441); console. log (e) alert ("a user registered network connection error ~ "); Window. location. reload () ;}, success: function (obj) {console. log (4442) // restart the server. the token is invalid. obtain the token again. if (typeof (obj) = 'undefined' | obj = null) {window. location. reload ();} if (obj. rs) {window. location. href = rootPath + "/loginRule";} else {alert (obj. msg); $ ("# _ form_token_uniq_id "). val (obj. token. token );}}

Reply content:

$. Ajax ({url: rootPath + "/doRegister", type: "post", data: dates, contentType: "application/x-www-form-urlencoded; charset = UTF-8 ", timeout: 30000, dataType: "json", cache: false, error: function (e) {console. log (4441); console. log (e) alert ("a user registered network connection error ~ "); Window. location. reload () ;}, success: function (obj) {console. log (4442) // restart the server. the token is invalid. obtain the token again. if (typeof (obj) = 'undefined' | obj = null) {window. location. reload ();} if (obj. rs) {window. location. href = rootPath + "/loginRule";} else {alert (obj. msg); $ ("# _ form_token_uniq_id "). val (obj. token. token );}}

I have encountered this problem just now, because my service is suspended.

If the error code returned by f12 is missing, check whether the error code 400 is returned for the request ......

You should put response to facilitate error locating.

You are incomplete. because it is incomplete, it can only be estimated that the error 400 is returned, or the data returned at the interface is not in the desired data format. And you didn't cut the response header, that is, the response headers, so I'm sorry, this can only be preliminarily estimated that there is no response!