correct indent of comment block and comment line

(function() {
    // js file for test

    /**
     * Usage:
     *
     *  confirm([ content | title | view ]).then([ yesCallback ], [ noCallback ])
     *  Ex.
     *  		PopUp
     *  		.confirm({
         *  			content: "Are you sure to..."
         *  	  	})
         *  	  	.then(function(){
             *  	  		console.log('say yes');
             *  	  	}, function(){
                 *  	  		console.log('say no');
                 *  	  	})
                 *  	  	.then ...
                 */
                var f = function(a, b, cdedfg) {
                    /*
                     * 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');
                };
})();