js传入不定个数的参数

   <script>
            
            function op(){
                var n = arguments.length;
                alert(n);
                var t = '';
                for (var i = 0; i < arguments.length; i++) {
                    t = t + arguments[i];
                }
                alert(t);
            }
            
            op('gh', 'fg', 'gfh', 'gfhgfh', 'gff');
        </script>