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。
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
var x = 6; // can be any number
var rand = Math.floor(Math.random()*x) + 1;
其他回答
或者,在Undercore
_.random(min, max)
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));
对于大数字。
var min_num = 900;
var max_num = 1000;
while(true){
let num_random = Math.random()* max_num;
console.log('input : '+num_random);
if(num_random >= min_num){
console.log(Math.floor(num_random));
break;
} else {
console.log(':::'+Math.floor(num_random));
}
}
其他解决方案:
(数学随机()*6|0)+1~~(数学随机()*6)+1
联机尝试
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);
}