What is the formula of JavaScript universal random number

Today, I would like to share with you the relevant knowledge of what the JavaScript universal random number formula is. The content is detailed and the logic is clear. I believe most people still know too much about this knowledge, so share this article for your reference. I hope you can get something after reading this article, and let's take a look at it.

Concept: it is a mathematical object, not a constructor, it has the properties and methods of mathematical constants and functions.

Math.PI-pi

Math.floor ()-- rounding down

Math.ceil ()-- rounding up

Math.round ()-rounded

Math.abs ()-absolute value

Math.max () / Math.min ()-- find the maximum and minimum values

Math.random ()-gets a random value in the range of [0Power1), and can randomly return a decimal. The range of values (0Power1) is left closed and right open.

Universal formula

Get a random number in a range

Value = Math.floor (Math.random () * Total number of possible values + first possible value)

Small case code example

Var arr = []; / / create an empty array to put random numbers

For (var I = 0; I < 5; iTunes +) {/ / circularly print 5 random numbers

Arr [I] = Math.round (Math.random () * 26 + 1); / / value = random number formula

For (var j = 0; j < I; Jake +) {/ / cyclic 5 random numbers

If (arr [I] = = arr [j]) {/ / compare

If it is equal, the number of times will not be recorded because five random numbers are printed in a loop, so a random number will be regenerated.

}

}

}

Console.log (arr); / / send 5 random numbers to the console

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