Objeto do Math do Javascript

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Objeto do Math do Javascript

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O objeto do Math � um objeto interno do certificado de Java que inclua constantes e fun��es do math. Voc� n�o necessita criar um objeto do Math no certificado de Java; existe automaticamente em todo o programa do certificado de Java. As propriedades do objeto do Math representam constantes matem�ticas, e seus m�todos s�o fun��es matem�ticas.

Valores matem�ticos

No Javascript h� oito valores matem�ticos (constantes) que podem ser alcan�ados do objeto do Math. Estes s�o: E, PI, raiz quadrada de 2, raiz quadrada de 1/2, registro natural de 2, registro natural de 10, registro base-2 de E, e registro base-10 do E.

Propriedades

Properties	Description
E	The constant of E, the base of natural logarithms.
LN2	The natural logarithm of 2.
LN10	The natural logarithm of 10.
LOG2E	Base 2 logarithm of E.
LOG10E	Base 10 logarithm of E.
PI	Returns PI.
SQRT1_2	Square root of 1/2.
SQRT2	Square root of 2.

M�todos

Methods	Description
abs(x)	Returns absolute value of x.
acos(x)	Returns arc cosine of x in radians.
asin(x)	Returns arc sine of x in radians.
atan(x)	Returns arc tan of x in radians.
atan2(y, x)	Counterclockwise angle between x axis and point (x,y).
ceil(x)	Returns the smallest integer greater than or equal to x. (round up).
cos(x)	Returns cosine of x, where x is in radians.
exp(x)	Returns e^x
floor(x)	Returns the largest integer less than or equal to x. (round down)
log(x)	Returns the natural logarithm (base E) of x.
max(a, b)	Returns the larger of a and b.
min(a, b)	Returns the lesser of a and b.
pow(x, y)	Returns X^y
random()	Returns a pseudorandom number between 0 and 1.
round(x)	Rounds x up or down to the nearest integer. It rounds .5 up.
sin(x)	Returns the Sin of x, where x is in radians.
sqrt(x)	Returns the square root of x.
tan(x)	Returns the Tan of x, where x is in radians.

Exemplo do Math (fun��o)

<script type="text/javascript">

document.write("Random: "+ Math.sin(180) + "<br/>")
document.write("PI: " + Math.cos(45) + "<br/>")
document.write("Sin: " + Math.tan(90) + "<br/>")

</script>

Sa�da

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Keywords:JavaScript Math Object JavaScript: The Math Object JavaScript Math Object Reference

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