Unicode escape / unescape on javascript via http://d.hatena.ne.jp/sawat/20070309/1173459459

gistfile1.js

var unicode = {
  escape: function(s) {
    return s.replace(/^[-~]|\\/g, function(m) {
      var code = m.charCodeAt(0);
      return '\\u' + ((code < 0x10) ? '000' : ((code < 0x100) ? '00' : ((code < 0x1000) ? '0' : ''))) + code.toString(16);
    });
  },
  unescape : function (s) {
    return s.replace(/\\u([a-fA-F0-9]{4})/g, function(matched, g1) {
      return String.fromCharCode(parseInt(g1, 16))
    })
  }
}