How to get random integers in js

There are many ways to get random integers in JavaScript, including: using Math.floor(Math.random() * (max - min 1)) min: generate between min and max (inclusive) of random integers; use Crypto.getRandomValues(): Generate safer random integers between min and max (inclusive).

How to get random integers in JavaScript

There are many ways to get random integers in JavaScript, please choose Which approach depends on specific needs.

Math.floor(Math.random() * (max - min 1)) min

The most common method is to use Math.random() and Math.floor() Function:

• Math.random() Returns a value between 0 (inclusive) and 1 (exclusive) ).
• Math.floor() Round the floating point number down.

Multiply Math.random() by max - min 1, you can get a value between min and A random floating point number between max (inclusive). Then use Math.floor() to round the floating point number down to get an integer. min and max are the minimum and maximum values ​​of the random integers to be generated.

Example:

<code class="js">// 生成一个介于 0 和 9（含）之间的随机整数
let randomInteger = Math.floor(Math.random() * (9 - 0 + 1)) + 0;
console.log(randomInteger); // 输出：介于 0 和 9 之间的随机整数</code>

Crypto.getRandomValues()

For cases where more secure random integers are required, you can use Crypto.getRandomValues() Method:

• window.crypto.getRandomValues() Returns a Uint8Array containing a random byte array .

You can use the fromArrayBuffer() method to convert Uint8Array to an integer:

Example:

<code class="js">// 生成一个介于 100 和 999（含）之间的随机整数
let buffer = new ArrayBuffer(4);
window.crypto.getRandomValues(buffer);
let int = new DataView(buffer).getUint32(0);
let min = 100;
let max = 999;
let randomInteger = int % (max - min + 1) + min;
console.log(randomInteger); // 输出：介于 100 和 999 之间的随机整数</code>

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