AJAX implements user login registration and exit

Ajax enables users to sign in and exit Step One: Verify the user name

Get
guestbook/index.php
M:index
A:verifyusername
Username: User name to verify
Returns
Code: returned message 0 = no error, 1 = Error
Message: Returned information specifically returned
Step Two: User registration

Post
guestbook/index.php
M:index
A:reg
Username: User name to verify
Password: registration password
Returns
Code: returned message 0 = no error, 1 = Error
Message: Returned information specifically returned
Third step: User Login

Call the update status function when the login is successful
Post
guestbook/index.php
M:index
A:login
Username: User name to log in
Password: login password
Returns
Code: returned message 0 = no error, 1 = Error
Message: Returned information specifically returned
Step Fourth: Verify Cookies

Write a function to get a cookie to write a function that updates the user's State based on whether the cookie value exists Fifth step: User Exit

Call the update status function when the user exits
Post
guestbook/index.php
M:index
A:logout
Returns
Code: returned message 0 = no error, 1 = Error
Message: Returned information specifically returned
(These are step descriptions and some backend interfaces)

The complete code is as follows

Window.onload=function () {var Ousername1=document.getelementbyid (' username1 ');//Username box (registered) var overifyusernamemsg= document.getElementById (' verifyusernamemsg '); Validate User name prompt box (register) var Opassword1=document.getelementbyid (' Password1 ' )//Password box (registered) var Obtnreg=document.getelementbyid (' Btnreg ');//Submit button (register) var Ousername2=document.getelementbyid (' Use Rname2 ');//Username box (login) var Opassword2=document.getelementbyid (' Password2 ');//Password box (login) var obtnlogin=document.getelemen Tbyid (' Btnlogin ');//Submit button (login) var Oreg=document.getelementbyid (' Reg ');//Register box var Ologin=document.getelementbyid (' Lo Gin ');//Login box var ouser=document.getelementbyid (' user ');//Exit box var Ouserinfo=document.getelementbyid (' userinfo ');//user
            Name (exit box) var Ologout=document.getelementbyid (' logout ');/Exit button (Exit box) function GetCookie (key) {//Get cookie value var arr=document.cookie.split (';
            ');
            Console.log (arr); for (Var i=0;i<arr.length;i++) {var Arr2=arr[I].split (' = ');
                Console.log (ARR2);
                if (Arr2[0]==key) {return arr2[1];
    }
            }
        };

    Updatauser ();
        function Updatauser (ouid) {//Update state function var ouid=getcookie (' uid ');

        var Ousername=getcookie (' username ');
            if (ouid) {ouser.style.display= ' block ';
            Ouserinfo.innerhtml=ousername;
            Oreg.style.display= ' None ';
        Ologin.style.display= ' None ';
            }else{ouser.style.display= ' None ';
            Ouserinfo.innerhtml= "";
            oreg.style.display= ' block ';
        ologin.style.display= ' block '; } ousername1.onblur=function () {//user name Validation ajax (' Get ', ' guestbook/index.php ', ' M=index&a=verifyuserna

             Me&username= ' +this.value,function (data) {var info=json.parse (data);
             Overifyusernamemsg.innerhtml=info.message; if (Info.code) {Overifyusernamemsg.style.Color= ' Red ';
             }else{overifyusernamemsg.style.color= ' green ';
    }
        });
    }; Obtnreg.onclick=function () {//Register submit button Ajax (' Post ', ' guestbook/index.php ', ' M=index&a=reg&use Rname= ' +encodeuri (ousername1.value) + ' &password= ' +opassword1.value, function (data) {var info=js
            On.parse (data);
            alert (info.message);
    if (!info.code) {oreg.style.display= ' None '}});
    }; Obtnlogin.onclick=function () {//Login submit button Ajax (' Post ', ' guestbook/index.php ', ' m=index&a=login&
                Amp;username= ' +encodeuri (ousername2.value) + ' &password= ' +opassword2.value, function (data) {
                var info=json.parse (data);
                alert (info.message);
                if (! Info.code) {updatauser ();

    }

            });

           };
   Ologout.onclick=function () {//Exit Submit button         Ajax (' Post ', ' guestbook/index.php ', ' m=index&a=logout ', function (data) {var inf
                O=json.parse (data);
                alert (info.message);
                if (! Info.code) {updatauser ();
            }

            });

           return false; }

}