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Math é um objecto integrado que tem propriedades e métodos correspondentes a constantes e funções matemáticas. Não é um objecto função.

Descrição

Contrariamente aos outros objectos globais, Math não é um construtor. Todas as propriedades e métodos de Math são estáticas. Refere-se a constante pi com Math.PI e chama-se a função de seno com Math.sin(x), em que x é o argumento do método. As constantes estão definidas com a precisão completa dos números reais do JavaScript.

Para extender o objecto Math, não se usa o protótipo. Em vez disso extende-se directamente o objecto Math:

Math.nomeProp=valorProp;

Math.nomeMetodo=refMetodo;

Propriedades

Math.E
Euler's constant and the base of natural logarithms, approximately 2.718.
Math.LN2
Natural logarithm of 2, approximately 0.693.
Math.LN10
Natural logarithm of 10, approximately 2.303.
Math.LOG2E
Base 2 logarithm of E, approximately 1.443.
Math.LOG10E
Base 10 logarithm of E, approximately 0.434.
Math.PI
Ratio of the circumference of a circle to its diameter, approximately 3.14159.
Math.SQRT1_2
Square root of 1/2; equivalently, 1 over the square root of 2, approximately 0.707.
Math.SQRT2
Square root of 2, approximately 1.414.

Métodos

Note that the trigonometric functions (sin(), cos(), tan(), asin(), acos(), atan(), atan2()) expect or return angles in radians. To convert radians to degrees, divide by (Math.PI / 180), and multiply by this to convert the other way.

Note that many math functions have a precision that's implementation-dependent. This means that different browsers can give a different result, and even the same JS engine on a different OS or architecture can give different results.

Math.abs(x)
Returns the absolute value of a number.
Math.acos(x)
Returns the arccosine of a number.
Math.acosh(x)
Returns the hyperbolic arccosine of a number.
Math.asin(x)
Returns the arcsine of a number.
Math.asinh(x)
Returns the hyperbolic arcsine of a number.
Math.atan(x)
Returns the arctangent of a number.
Math.atanh(x)
Returns the hyperbolic arctangent of a number.
Math.atan2(y, x)
Returns the arctangent of the quotient of its arguments.
Math.cbrt(x)
Returns the cube root of a number.
Math.ceil(x)
Returns the smallest integer greater than or equal to a number.
Math.clz32(x)
Returns the number of leading zeroes of a 32-bit integer.
Math.cos(x)
Returns the cosine of a number.
Math.cosh(x)
Returns the hyperbolic cosine of a number.
Math.exp(x)
Returns Ex, where x is the argument, and E is Euler's constant (2.718…), the base of the natural logarithm.
Math.expm1(x)
Returns subtracting 1 from exp(x).
Math.floor(x)
Returns the largest integer less than or equal to a number.
Math.fround(x)
Returns the nearest single precision float representation of a number.
Math.hypot([x[, y[, …]]])
Returns the square root of the sum of squares of its arguments.
Math.imul(x, y)
Returns the result of a 32-bit integer multiplication.
Math.log(x)
Returns the natural logarithm (loge, also ln) of a number.
Math.log1p(x)
Returns the natural logarithm (loge, also ln) of 1 + x for a number x.
Math.log10(x)
Returns the base 10 logarithm of a number.
Math.log2(x)
Returns the base 2 logarithm of a number.
Math.max([x[, y[, …]]])
Returns the largest of zero or more numbers.
Math.min([x[, y[, …]]])
Returns the smallest of zero or more numbers.
Math.pow(x, y)
Returns base to the exponent power, that is, baseexponent.
Math.random()
Returns a pseudo-random number between 0 and 1.
Math.round(x)
Returns the value of a number rounded to the nearest integer.
Math.sign(x)
Returns the sign of the x, indicating whether x is positive, negative or zero.
Math.sin(x)
Returns the sine of a number.
Math.sinh(x)
Returns the hyperbolic sine of a number.
Math.sqrt(x)
Returns the positive square root of a number.
Math.tan(x)
Returns the tangent of a number.
Math.tanh(x)
Returns the hyperbolic tangent of a number.
Math.toSource()
Returns the string "Math".
Math.trunc(x)
Returns the integral part of the number x, removing any fractional digits.

Especificações

Specification Status Comment
ECMAScript 1st Edition (ECMA-262) Standard Initial definition. Implemented in JavaScript 1.1.
ECMAScript 5.1 (ECMA-262)
The definition of 'Math' in that specification.
Standard  
ECMAScript 2015 (6th Edition, ECMA-262)
The definition of 'Math' in that specification.
Standard New methods log10(), log2(), log1p(), expm1(), cosh(), sinh(), tanh(), acosh(), asinh(), atanh(), hypot(), trunc(), sign(), imul(), fround(), cbrt() and clz32() added.
ECMAScript Latest Draft (ECMA-262)
The definition of 'Math' in that specification.
Draft  

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support (Yes) (Yes) (Yes) (Yes) (Yes)
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support (Yes) (Yes) (Yes) (Yes) (Yes) (Yes)

See also

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