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

实例

返回1到10之间的随机数:

Math.floor((Math.random() * 10) + 1);

结果可能是:3.

试试看:这里

--

或使用lodash/descore:

_.随机(最小值,最大值)

文件:-罗达什-不受欢迎的

其他回答

范围[a,b]内的加密强随机整数(假设:a<b)

let rand=(a,b)=>a+(b-a+1)*crypto.getRandomValues(新Uint32Array(1))[0]/2**32|0console.log(兰特(1,6));

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);
}

其他解决方案:

(数学随机()*6|0)+1~~(数学随机()*6)+1

联机尝试

此函数可以生成介于(包括)最小值和最大值之间的随机整数:

function randomNumber(min, max) {
  if (min > max) {
    let temp = max;
    max = min;
    min = temp;
  }

  if (min <= 0) {
    return Math.floor(Math.random() * (max + Math.abs(min) + 1)) + min;
  } else {
    return Math.floor(Math.random() * (max - min + 1)) + min;
  }
}

例子:

randomNumber(-2, 3); // can be -2, -1, 0, 1, 2 and 3
randomNumber(-5, -2); // can be -5, -4, -3 and -2
randomNumber(0, 4); // can be 0, 1, 2, 3 and 4
randomNumber(4, 0); // can be 0, 1, 2, 3 and 4

这已经晚了九年,但randojs.com让这成为了一个简单的一行:

rando(1, 6)

您只需要将其添加到html文档的头部,就可以轻松地使用随机性做任何事情。数组中的随机值、随机jquery元素、对象中的随机财产,甚至在需要时防止重复。

<script src="https://randojs.com/1.0.0.js"></script>