jsfiddle：https://jsfiddle.net/cyGwf/477/

随机整数：要获得最小值和最大值之间的随机整数，请使用以下代码

function getRandomInteger(min, max) {
  min = Math.ceil(min);
  max = Math.floor(max);
  return Math.floor(Math.random() * (max - min)) + min;
}

随机浮点数：要获得最小值和最大值之间的随机浮点数，请使用以下代码

function getRandomFloat(min, max) {
  return Math.random() * (max - min) + min;
}

参考：https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/random

这应该是有效的：

const getRandomNum = (min, max) => Math.floor(Math.random() * (max - min + 1)) + min

获取0到400之间的随机整数

let rand=数学舍入（Math.random（）*400）document.write（兰特）

获取200到1500之间的随机整数

让范围＝｛min:200，max:1500｝设delta=范围.max-范围.minconst rand=数学舍入（range.min+Math.random（）*delta）document.write（兰特）

使用函数

函数randBetween（最小值，最大值）{设delta=最大值-最小值return Math.round（min+Math.random（）*delta）}document.write（randBetween（10，15））；

//JavaScript ES6箭头函数常量randBetween=（最小值，最大值）=>{设delta=最大值-最小值return Math.round（min+Math.random（）*delta）}document.write（randBetween（10，20））

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));
    }
}

如果您想覆盖负数和正数，并确保其安全，请使用以下方法：

JS解决方案：

function generateRangom(low, up) {
  const u = Math.max(low, up);
  const l = Math.min(low, up);
  const diff = u - l;
  const r = Math.floor(Math.random() * (diff + 1)); //'+1' because Math.random() returns 0..0.99, it does not include 'diff' value, so we do +1, so 'diff + 1' won't be included, but just 'diff' value will be.
  
  return l + r; //add the random number that was selected within distance between low and up to the lower limit.  
}

Java解决方案：

public static int generateRandom(int low, int up) {
        int l = Math.min(low, up);
        int u = Math.max(low, up);
        int diff = u - l;

        int r = (int) Math.floor(Math.random() * (diff + 1)); // '+1' because Math.random() returns 0..0.99, it does not include 'diff' value, so we do +1, so 'diff + 1' won't be included, but just 'diff' value will be.
  
        return l + r;//add the random number that was selected within distance between low and up to the lower limit.      
}

ES6/Arrow函数版本基于Francis的代码（即顶级答案）：

const randomIntFromInterval = (min, max) => Math.floor(Math.random() * (max - min + 1) + min);