Math.random未返回正确的值

Question

所以，我想知道我到底做错了什么？它给出了类似于3的数字(我将变量a作为“7-10”传递)

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(包含)到1 (exclusive)之间的随机值。要获得7到10之间的数字，需要指定最大值，减去最小，然后将最小值添加到结果中

这个调整后的代码会在你的范围内返回随机伤害。请记住:如果您确实希望获得最大值10，则需要传递11作为 Math.random 的上限，因为上限是

​

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;

}

好的回复可以在@ Generate random number between two numbers in JavaScript上找到