javascript中arguments的应用——不定项传参求和

    <script type="text/javascript">
        window.onload=function(){
            function sum(){
                var result=null;
                for(var i=0; i<arguments.length;i++){
                    result+=arguments[i];
                }
                return result;
            }
            alert(sum(1,2));//sum中参数两个
            alert(sum(1,2,3,555,888,666,333,555,777)); //sum中参数任意个
        }
    </script>