Question

所以，我想知道我在这里做错了什么？它给了我3个数字。（我将变量a传递为“7-10”）

function getDmg(a, y) {
    var s = Math.floor((Math.random() * (a.split('-')[1])) + (a.split('-')[0])); 
    if(y == true) {
        console.log('You dealt ' + s + ' damage.');
    } else {
        console.log('You took ' + s + ' damage.');
    }
    return s; // Giving numbers like 3...?
}

Answer 1

Math.random返回0（包括）和1（独占）之间的随机值。要获得从7到10的数字，您需要指定最大值，减去min 然后将最小值添加到结果：

此调整后的代码会返回您所在范围内的随机损失。 请记住：如果您确实想要获得最多10分，则需要将11作为Math.random的上限值，因为上限值是独占的：

function getDmg(a, y) {
    var min = parseInt(a.split('-')[0],10);
    var max = parseInt(a.split('-')[1],10);
  
    var s = Math.floor(Math.random() * (max - min) + min); 
    if(y == true) {
        console.log('You dealt ' + s + ' damage.');
    } else {
        console.log('You took ' + s + ' damage.');
    }
    return s; // Giving numbers like 3...?
}

getDmg("7-11", true);
getDmg("7-11", false);

有关Math.random()

的详细信息，请参阅：https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/random

Answer 2

function getDmg(range, dealt) {
    var damageRange = range.split("-");

    //This will have to be made more "error-proof"
    var min = Number(damageRange[0]);
    var max = Number(damageRange[1]);

    //This formula will take the min and max into account
    var calculatedDamage = Math.floor(Math.random() * (max - min + 1)) + min;

    console.log((dealt ? "You dealt " : "You took ") + calculatedDamage + " damage.");
    return calculatedDamage;

}

可以在Generate random number between two numbers in JavaScript

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Math.random没有返回正确的值

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