make it works better with line comment

test code:

(function() {
    // js file for test

    /**
     * make the int second time to string 00:00:00
     * @param {type} second
     * @param {type} digit
     * @returns {String}
     */
    var f = function(second, digit) {
        /*
         * some comments
         */
        return (sign + arr.join(':').replace(/\b(\d)\b/g, "0$1"));
    };

    // var f2 = function(second, digit) {
        // var arr = [],
            // sign = '';
        // var test = 'zz';
        // var qq = 'ddd';

        // if (0 < second) {
            // sign = '+';
        // }
    // };


    var urlError = function() {
        /* hahah */
        throw new Error('A "url" property or function must be specified');
    };
})();