[JavaScript]内置对象Math初识

function randomBetween(min, max) {
    min = Math.floor(min);
    max = Math.ceil(max);
    return Math.floor(Math.random() * (max - min + 1) + min);
}
console.log(randomBetween(100, 200));

var result = randomBetween(1, 100);
var chances = 10;
var guess = prompt(‘有一个1~100的整数，猜猜它是几？\n您有‘ + chances + ‘次机会。\n输入0退出。‘);
while (true) {
    chances--;
    if (guess === ‘0‘) {
        alert(‘谢谢参与。‘);
        break;
    } else if (guess == result) {
        alert(‘恭喜猜对了数字！答案是：‘ + result);

        // 重新开始
        result = randomBetween(1, 100);
        chances = 10;
        guess = prompt(‘有一个1~100的整数，猜猜它是几？\n您还有‘ + chances + ‘次机会。\n输入0退出。‘);
    } else if (guess != result && chances === 0) {
        alert(‘很抱歉，次数已用完。\n这个数字应该是‘ + result);
        break;
    } else if (guess < result && guess > 0) {
        guess = prompt(‘太小啦，再猜一猜~\n您还有‘ + chances + ‘次机会。\n输入0退出。‘);
    } else if (guess > result && guess <= 100) {
        guess = prompt(‘太大啦，再猜一猜~\n您还有‘ + chances + ‘次机会。\n输入0退出。‘);
    } else {
        guess = prompt(‘输入无效，请输入一个1~100的整数。\n您还有‘ + chances + ‘次机会。\n输入0退出。‘);
    }
}