JavaScript解决录入成绩并输出最高分和最低分问题

1.            var arr = [];
            var max;
            var min;
            while (true) {
                var score = prompt('请输入学生成绩');
                if (score == 'exit') {
                    break;
                }
                score = Number(score);
                arr[arr.length] = score;
            }
            max = arr[0];
            min = arr[0];
            for (var i = 0; i < arr.length; i++) {
                if (max < arr[i]) {
                    max = arr[i];
                }
                if (min > arr[i]) {
                    min = arr[i];
                }
            }
            console.log(arr);
            console.log(max, min);