base64:{
      // utf8 to base64
      encode:function  (playload) {
        // return btoa (playload);
        // return btoa (escape (playload));
        return btoa (unescape (encodeURIComponent (playload)));
      },
      // base64 to utf8
      decode:function  (playload) {
        return atob (playload)
        // return unescape (atob (playload));
        return decodeURIComponent (escape (atob (playload)));
      }
    },