How do you log out with java script

[#1]

This is the code I have along with the errors I get with both vue router and regular ajax:

doRequest: function (url, method, successCb, errorCb, params, conf) {
    var pms = [];
    if (typeof params === 'object') pms = params;
        function callback(body) {
            console.log(body);
            return [];
        }


        var httpCong = {
            url: url,
            method: method,
            crossDomain: true,
            data: params
        };

        if (pms !== null && typeof pms === 'object') {
            if (Object.keys(pms).length > 0) {
            httpCong['processData'] = true;
        }
    }
    if (typeof conf === 'object') {
        if (typeof conf.dataType !== 'undefined') {
            httpCong['dataType'] = conf.dataType;
        }
    }

    var request = $.ajax(httpCong);
    request.done(function(body) {
    self.doingAction = false;

    var out = {body: body};

    if (!body) out['data'] = [];
    else out['data'] = JSON.parse(body);

    if (successCb) successCb(out);
       self.doingAction = false;
   });

    request.fail(function(body) {

        var out = {body: body};
        out['data'] = JSON.parse(body);
        if (errorCb) errorCb(out);
        self.doingAction = false;
    });

this.$http.delete('https://ip/dev-test/qps/user?QlikTicket=' + this.qlikTicket, {
       headers: {
           'Access-Control-Allow-Origin': 'http://13.81.124.229'
       }
  })
  .then(function (response) {
       console.log('response: ', response);
    },
    function (error) {
       console.log('ERROR: ');
       console.log(error);
    }
)


this.doRequest('https://ip/qps/dev-test/session/' + this.qlikTicket, 'delete',
//this.doRequest('https://ip/dev-test/qps/user', 'delete',
    function (res) {
        console.log('response: ', res);
    },
    function (error) {
        console.log('ERROR: ');
        console.log(error);
    },
    null,
    {
    //dataType: "jsonp"
    })
;

Errors:

XMLHttpRequest cannot load https://ip/qps/dev-test/session/_Bszur-jQsCMNSzj. Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:8000' is therefore not allowed access.
VM40803:1 Uncaught SyntaxError: Unexpected token o in JSON at position 1
    at JSON.parse (<anonymous>)
    at Object.<anonymous> ((index):961)
    at j (require.js?QlikTicket=_Bszur-jQsCMNSzj:12)
    at Object.fireWith [as rejectWith] (require.js?QlikTicket=_Bszur-jQsCMNSzj:12)
    at d (require.js?QlikTicket=_Bszur-jQsCMNSzj:13)
    at XMLHttpRequest.<anonymous> (require.js?QlikTicket=_Bszur-jQsCMNSzj:13)
(anonymous) @ (index):961
j @ require.js?QlikTicket=_Bszur-jQsCMNSzj:12
fireWith @ require.js?QlikTicket=_Bszur-jQsCMNSzj:12
d @ require.js?QlikTicket=_Bszur-jQsCMNSzj:13
(anonymous) @ require.js?QlikTicket=_Bszur-jQsCMNSzj:13
ip/dev-test/qps/user?QlikTicket=_Bszur-jQsCMNSzj:1 DELETE https://ip/dev-test/qps/user?QlikTicket=_Bszur-jQsCMNSzj 500 (Internal server error)

doRequest with json P to the first URL error:

VM41904:1 Uncaught SyntaxError: Unexpected token o in JSON at position 1
    at JSON.parse (<anonymous>)
    at Object.<anonymous> ((index):961)
    at j (require.js?QlikTicket=ayllZsvuxMkBQnr4:12)
    at Object.fireWith [as rejectWith] (require.js?QlikTicket=ayllZsvuxMkBQnr4:12)
    at d (require.js?QlikTicket=ayllZsvuxMkBQnr4:13)
    at HTMLScriptElement.c (require.js?QlikTicket=ayllZsvuxMkBQnr4:13)
    at HTMLScriptElement.dispatch (require.js?QlikTicket=ayllZsvuxMkBQnr4:12)
    at HTMLScriptElement.q.handle (require.js?QlikTicket=ayllZsvuxMkBQnr4:12)

doRequest with json P to the second URL error:

Uncaught SyntaxError: Unexpected token :
VM42557:1 Uncaught SyntaxError: Unexpected token o in JSON at position 1
    at JSON.parse (<anonymous>)
    at Object.<anonymous> ((index):961)
    at j (require.js?QlikTicket=J4W1Bls5CU_S79LS:12)
    at Object.fireWith [as rejectWith] (require.js?QlikTicket=J4W1Bls5CU_S79LS:12)
    at d (require.js?QlikTicket=J4W1Bls5CU_S79LS:13)
    at HTMLScriptElement.c (require.js?QlikTicket=J4W1Bls5CU_S79LS:13)
    at HTMLScriptElement.dispatch (require.js?QlikTicket=J4W1Bls5CU_S79LS:12)
    at HTMLScriptElement.q.handle (require.js?QlikTicket=J4W1Bls5CU_S79LS:12)