有没有办法用JavaScript生成指定范围内的随机数?

例如:指定范围从1到6,随机数可以是1、2、3、4、5或6。


当前回答

重要的

The following code works only if the minimum value is `1`. It does not work for minimum values other than `1`.

如果你想得到一个介于1(且只有1)和6之间的随机整数,你可以计算:

const rndInt=数学地板(Math.random()*6)+1控制台日志(rndInt)

哪里:

1是起始编号6是可能结果的数量(1+start(6)-end(1))

其他回答

重要的

The following code works only if the minimum value is `1`. It does not work for minimum values other than `1`.

如果你想得到一个介于1(且只有1)和6之间的随机整数,你可以计算:

const rndInt=数学地板(Math.random()*6)+1控制台日志(rndInt)

哪里:

1是起始编号6是可能结果的数量(1+start(6)-end(1))

var x = 6; // can be any number
var rand = Math.floor(Math.random()*x) + 1;

尝试使用:

函数随机(最小值,最大值){return Math.round((Math.random()*(Math.abs(max-min)))+min);}console.log(随机(1,6));

简短回答:使用简单的数组即可实现。

您可以在数组元素内交替。

即使您的值不是连续的,此解决方案也有效。值甚至不必是数字。

let array = [1, 2, 3, 4, 5, 6];
const randomValue = array[Math.floor(Math.random() * array.length)];

这个简单的功能很方便,在任何情况下都可以使用(经过充分测试)。此外,结果的分布已经过充分测试,100%正确。

function randomInteger(pMin = 1, pMax = 1_000_000_000)
//Author: Axel Gauffre. 
//Here: https://stackoverflow.com/a/74636954/5171000
//Inspired by: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/random#getting_a_random_number_between_two_values
//
//This function RETURNS A RANDOM INTEGER between pMin (INCLUDED) and pMax (INCLUDED).
//  - pMin and pMax should be integers.
//  - HOWEVER, if pMin and/or pMax are FLOATS, they will be ROUNDED to the NEAREST integer.
//  - NEGATIVE values ARE supported.
//  - The ORDER of the 2 arguments has NO consequence: If pMin > pMax, then pMin and pMax will simply be SWAPPED.
//  - If pMin is omitted, it will DEFAULT TO 1.
//  - If pMax is omitted, it will DEFAULT TO 1 BILLION.
//
//This function works in ANY cases (fully tested).
//Also, the distribution of the results has been fully tested and is 100% correct.
{
    pMin = Math.round(pMin);
    pMax = Math.round(pMax);
    if (pMax < pMin) { let t = pMin; pMin = pMax; pMax = t;}
    return Math.floor(Math.random() * (pMax+1 - pMin) + pMin);
}