function addslashes (str) {
  // http://kevin.vanzonneveld.net
  // +   original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
  // +   improved by: Ates Goral (http://magnetiq.com)
  // +   improved by: marrtins
  // +   improved by: Nate
  // +   improved by: Onno Marsman
  // +   input by: Denny Wardhana
  // +   improved by: Brett Zamir (http://brett-zamir.me)
  // +   improved by: Oskar Larsson Högfeldt (http://oskar-lh.name/)
  // *     example 1: addslashes("kevin's birthday");
  // *     returns 1: 'kevin\'s birthday'
  return (str + '').replace(/[\\"']/g, '\\$&').replace(/\u0000/g, '\\0');
}

addslashes("kevin's birthday");

'kevin\'s birthday'