How to use Math.random () in JavaScript
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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