How to generate random numbers in js

There are two main ways to generate random numbers in JavaScript: Math.random() generates a floating point number between 0 and 1. crypto.getRandomValues() uses a cryptographically strong pseudo-random number generator (CSPRNG) to generate more secure random bytes.

How to generate random numbers in JavaScript

There are two main ways to generate random numbers in JavaScript ：

1. Math.random()

The Math.random() method returns a random value between 0 (inclusive) and 1 (exclusive) Floating point number. You can combine it with other operators to generate random numbers in different ranges. For example:

// 生成一个 0 到 9 之间的随机整数
Math.floor(Math.random() * 10);

2. crypto.getRandomValues()

crypto.getRandomValues() method returns a Uint8Array containing a cryptographically strong pseudo-random number generator (CSPRNG) ) generated random bytes. This method can be used to generate more secure random numbers, but it may not be supported in older browsers compared to Math.random(). For example:

// 生成一个 0 到 255 之间的随机整数
const arrayBuffer = new Uint8Array(1);
crypto.getRandomValues(arrayBuffer);
const randomNumber = arrayBuffer[0];

Choose the appropriate method

For most cases, Math.random() provides a random number that is random and stable enough. However, if you need more secure random numbers or need support in older browsers, you can use crypto.getRandomValues().

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