strtr no Javascript

String.clean.js

/**
 * Limpa as caracteres especiais da string atual
 * 
 * @return {string}
 */
String.prototype.clean = function ()
{
    return this.strtr(
        'ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõöøùúûýýþÿŔŕ´`"\'~^',
        'AAAAAAACEEEEIIIIDNOOOOOOUUUUYbsaaaaaaaceeeeiiiidnoooooouuuyybyRr'
    );
};

String.strtr.js

/**
 * Traduz as caracteres de 'from' para 'to'
 * 
 * @param {string} from
 * @param {string} to
 * @return {string}
 */
String.prototype.strtr = function (from, to)
{
    var i,
    _this = this.toString();
    from = (from + '').split('');
    to = (to + '').split('');
    i = from.length;

    while (i--)
    {
        if (_this.match(from[i])) {
            // Troca por to, Se to[i] não existir a nova char será vazia
            _this = _this.replace(new RegExp('\\' + from[i], 'ig'), (to[i] || ''));
        }
    }
    
    return _this;
};