example page using cookie

function setCookie(name,value,days) {
    var expires = "";
    if (days) {
        var date = new Date();
        date.setTime(date.getTime() + (days*24*60*60*1000));
        expires = "; expires=" + date.toUTCString();
    }
    document.cookie = name + "=" + (value || "")  + expires + "; path=/";
}
function getCookie(name) {
    var nameEQ = name + "=";
    var ca = document.cookie.split(';');
    for(var i=0;i < ca.length;i++) {
        var c = ca[i];
        while (c.charAt(0)==' ') c = c.substring(1,c.length);
        if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
    }
    return null;
}

setCookie("user_email","[email protected]",30); //set "user_email" cookie, expires in 30 days
var userEmail=getCookie("user_email");//"[email protected]"

function checkCookie() {
  var 
username = getCookie("username");
  if (username != "") {

     alert("Welcome again " + username);

  } else {

    username = prompt("Please enter your name:", "");

      if (username != "" 
&& username != null) {

        setCookie("username", username, 365);

      }
  }
}
 

function getCookie(cname) {

   
var name = cname + "=";

   
var decodedCookie = decodeURIComponent(document.cookie);

  var ca = decodedCookie.split(';');

  for(var i = 0; i <ca.length; i++) {

      var c = ca[i];
    while (c.charAt(0) == ' ') {
      c = c.substring(1);

      
 }

      if (c.indexOf(name) == 0) {
      return c.substring(name.length, c.length);

      }

    }

    return "";

}