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This article focuses on "how to use JavaScript Math objects". Interested friends may wish to have a look at it. The method introduced in this paper is simple, fast and practical. Now let the editor take you to learn how to use JavaScript Math objects.

JavaScript Math (arithmetic) object

The purpose of the Math object is to perform common arithmetic tasks.

Online instance

Round ()

How to use round ().

Random ()

How to use random () to return a random number between 0 and 1.

Max ()

How to use max () to return the larger of two given numbers. (before ECMASCript v3, this method had only two parameters.)

Min ()

How to use min () to return the smaller of two given numbers. (before ECMASCript v3, this method had only two parameters.)

Math object

The purpose of the Math object is to perform ordinary arithmetic tasks.

The Math object provides a variety of arithmetic value types and functions. There is no need to define this object before using it.

Syntax for properties / methods that use Math:

Var x=Math.PI

Var y=Math.sqrt (16)

Note: the Math object does not need to be defined before using it.

Arithmetic value

JavaScript provides eight arithmetic values that can be accessed by Math objects:

You can refer to the following Javascript constant usage method:

Math.E

Math.PI

Math.SQRT2

Math.SQRT1_2

Math.LN2

Math.LN10

Math.LOG2E

Math.LOG10E

Arithmetic method

In addition to the arithmetic values that can be accessed by the Math object, there are several functions (methods) that can be used.

The following example uses the round method of the Math object to round a number.

[xss_clean] (Math.round (4.7)

The output of the above code is:

five

The following example uses the random () method of the Math object to return a random number between 0 and 1:

[xss_clean] (Math.random ())

The output of the above code is:

0.4321440459646637

The following example uses the floor () method and random () of the Math object to return a random number between 0 and 11:

[xss_clean] (Math.floor (Math.random () * 11))

The output of the above code is:

five

JavaScript Boolean (Boolean) object

JavaScript RegExp object

1 note

Whi***08@outlook.com

For pseudorandom numbers, JS has many ways to generate the pseudorandom numbers we need.

Generate random numbers according to the upper and lower limits:

Var rand = (min,max) = > Math.round (Math.random () * (max-min)) + min

/ / Max is the maximum and Min is the minimum

Randomly generate bool values based on probability:

Function randBool (percent=0.5) {

/ / percent is probability. Default is 0.5 (50%).

If (Math.random ()

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