JS 可变参数 arguments

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      // 可变参数 arg，uments关键字
        function sum() {
            var s = 0;
            for (var i = 0; i < arguments.length; i++) {
                s += arguments[i];
            }
            return s;
        }

        function execution(){
            alert(sum(1, 2, 3, 4));
            alert(sum(11, 22, 33, 44));
        }

       window.onload = execution;