Example How to create cookie in javascript
Create a Cookie with JavaScript
JavaScript can create, read, and delete cookies with the document.cookie property.
function createCookie (name, value, days) {
  if (days) {
    var date = new Date()
    date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000))
    var expires = '; expires=' + date.toGMTString()
  }
  else {
    var expires = ''
  }
  document.cookie = name + '=' + value + expires + '; path=/'
}