JS1-4

        var score = 50;
        if (score > 100 || score < 0) {
            console.log("不合理的结果");
        } else if (score >= 95) {
            console.log("卓越");
        } else if (score >= 85) {
            console.log("优秀");
        } else if (score >= 75) {
            console.log("一般");
        } else if (score >= 60) {
            console.log("及格");
        } else {
            console.log("不合格")
        }

        var x = 10;
        var y = 8;
        var operator = "+";
        var answer;
        switch (operator) {
            case "+":
                answer = x + y;
                break;
            case "-":
                answer = x - y;
                break;
            case "*":
                answer = x * y;
                break;
            case "/":
                answer = x / y;
                break;
        }
        console.log(answer);

        var answer = 0;
        for (var i = 0; i <= 100; i++) {
            if (i % 10 != 3) {
                answer += i;
            }
        }
        console.log(answer);

        var max = 6;
        for (; max > 0; max--) {
            for (var printTimes = 0; printTimes < max; printTimes++) {
                console.log("* ");
            }
            console.log(" /n ")
        }

        for (var number = 1; number <= 9; number++) {
            for (var lastNumber = 1; lastNumber <= number; lastNumber++) {
                var print = number + "*" + lastNumber + "=" + lastNumber * number
                console.log(print);
            }
            console.log(" /n ")
        }