如何使用保存在另一个html文件中的数组中的表单数据

Question

im having a project in which there is an html file for sign up and another one for login. So i am storing the data from the sign up form in some arrays and i want to use them in the login file but the arrays seems to be empty. Is there somekind of global array in javascript or something like that? Thanks in advance :) My javascript code is:

var usernames=[]; //login usernames
var passwords=[]; //login passwords
var personUsr = []; //signup usernames
var personPass = []; //signup passwords

function insert(){ //login onclick function
 var usernameValue = document.getElementById('username').value;
 var passwordValue = document.getElementById('password').value;

 usernames[usernames.length]=usernameValue;
 passwords[passwords.length]=passwordValue;

 document.getElementById('username').value="";
 document.getElementById('password').value="";
 for(var i = 0; i < personUsr.length; i++) {
   if(titleValue===personUsr[i]){
       alert("user found"); }
   else{
       alert("no user with that username");}      
    }
 }


function submitSignUp(){ //signup onclick function

    var firstName = signupform.elements["firstname"].value;
    var lastName = signupform.elements["lastname"].value;
    var country = signupform.elements["countrySel"].selectedIndex.value;
    var user = signupform.elements["username"].value;
    var pass = signupform.elements["password"].value;
    var repass = signupform.elements["password2"].value;

    personUsr[personUsr.length]=user;
    personPass[personPass.length]=pass;         
 }  

Answer 1

AJAX is built for this purpose. If you want to post javascript variable to other page you should use ajax.

Else you can use a sever-side technique to do this