cookie method

var CookieUtil = {
  get: function (name) {
    var cookieName = encodeURIComponent(name) + "=",
      cookieStart = document.cookie.indexOf(cookieName),
      cookieValue = null;
    if (cookieStart > -1) {
      var cookieEnd = document.cookie.indexOf(";", cookieStart);
      if (cookieEnd == -1) {
        cookieValue = decodeURIComponent(document.cookie.substring(cookieStart + cookieName.length, cookieEnd));
        cookieEnd = document.cookie.length;
      }
      return cookieValue;
    }
  },
  set: function (name, value, expires, path, domain, secure) {
    var cookieText = encodeURIComponent(name) + "=" +
      encodeURIComponent(value);
    if (expires instanceof Date) {
      cookieText += "; expires=" + expires.toGMTString();
    }
    if (path) {
      cookieText += "; path=" + path;
    }
    if (domain) {
      cookieText += "; domain=" + domain;
    }
    if (secure) {
      cookieText += "; secure";
    }
    document.cookie = cookieText;
  },
  unset: function (name, path, domain, secure) {
    this.set(name, "", new Date(0), path, domain, secure);
  }
};