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The Math object allows you to perform common
mathematical tasks.
Tip: You will find a lot more examples in the Math
object reference - look at the bottom of this page!
Math Object
The Math object allows you to perform common mathematical
tasks.
The Math object includes several mathematical values and
functions. You do not need to define the Math object before
using it.
Mathematical Values
JavaScript provides eight mathematical values (constants)
that can be accessed from the Math object. These are: E, PI,
square root of 2, square root of 1/2, natural log of 2, natural
log of 10, base-2 log of E, and base-10 log of E.
You may reference these values from your JavaScript like
this:
Math.E
Math.PI
Math.SQRT2
Math.SQRT1_2
Math.LN2
Math.LN10
Math.LOG2E
Math.LOG10E
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Mathematical Methods
In addition to the mathematical values that can be accessed
from the Math object there are also several functions (methods)
available.
Examples of functions (methods):
The following example uses the round() method of the Math
object to round a number to the nearest integer:
document.write(Math.round(4.7))
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The code above will result in the following output:
The following example uses the random() method of the Math
object to return a random number between 0 and 1:
document.write(Math.random())
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The code above can result in the following output:
The following example uses the floor() and random() methods
of the Math object to return a random number between 0 and 10:
document.write(Math.floor(Math.random()*11))
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The code above can result in the following output:
Complete Math Object Reference
The reference contains a brief description and examples of
use for each property and method! |
