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This article mainly introduces how to use Math.random () in JavaScript, which has a certain reference value. Interested friends can refer to it. I hope you will gain a lot after reading this article.

Math.random ()

Math.random () returns a random number between 0 (inclusive) and 1 (excluding):

Example

Math.random (); / / returns a random number

Math.random () always returns a number less than 1.

JavaScript random integer

Math.random () is used in conjunction with Math.floor () to return random integers.

Example

Math.floor (Math.random () * 10); / / returns a number between 0 and 9

Example

Math.floor (Math.random () * 11); / / returns a number between 0 and 10

Example

Math.floor (Math.random () * 100); / / returns a number between 0 and 99

Example

Math.floor (Math.random () * 101); / / returns a number between 0 and 100

Example

Math.floor (Math.random () * 10) + 1; / / returns a number between 1 and 10

Example

Math.floor (Math.random () * 100) + 1; / / returns a number between 1 and 100

An appropriate random function

As you can see from the example above, it is a good idea to create a random function to generate all random integers.

This JavaScript function always returns a random number between min (inclusive) and max (exclusive):

Example

Function getRndInteger (min, max) {

Return Math.floor (Math.random () * (max-min)) + min

}

This JavaScript function always returns a random number between min and max (both included):

Example

Function getRndInteger (min, max) {

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

}

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