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---
title: Math
slug: Web/JavaScript/Reference/Global_Objects/Math
translation_of: Web/JavaScript/Reference/Global_Objects/Math
---
<div>{{JSRef}}</div>
<p><strong><code>Math</code></strong> é um objecto integrado que tem propriedades e métodos correspondentes a constantes e funções matemáticas. Não é um objecto função.</p>
<h2 id="Descrição">Descrição</h2>
<p>Contrariamente aos outros objectos globais, <code>Math</code> não é um construtor. Todas as propriedades e métodos de <code>Math</code> são estáticas. Refere-se a constante pi com <code>Math.PI</code> e chama-se a função de seno com <code>Math.sin(x)</code>, em que x é o argumento do método. As constantes estão definidas com a precisão completa dos números reais do JavaScript.</p>
<p>Para extender o objecto <code>Math</code>, não se usa o protótipo. Em vez disso extende-se directamente o objecto <code>Math</code>:</p>
<p>Math.nomeProp=valorProp;</p>
<p>Math.nomeMetodo=refMetodo;</p>
<h2 id="Propriedades">Propriedades</h2>
<dl>
<dt>{{jsxref("Math.E")}}</dt>
<dd>Euler's constant and the base of natural logarithms, approximately 2.718.</dd>
<dt>{{jsxref("Math.LN2")}}</dt>
<dd>Natural logarithm of 2, approximately 0.693.</dd>
<dt>{{jsxref("Math.LN10")}}</dt>
<dd>Natural logarithm of 10, approximately 2.303.</dd>
<dt>{{jsxref("Math.LOG2E")}}</dt>
<dd>Base 2 logarithm of E, approximately 1.443.</dd>
<dt>{{jsxref("Math.LOG10E")}}</dt>
<dd>Base 10 logarithm of E, approximately 0.434.</dd>
<dt>{{jsxref("Math.PI")}}</dt>
<dd>Ratio of the circumference of a circle to its diameter, approximately 3.14159.</dd>
<dt>{{jsxref("Math.SQRT1_2")}}</dt>
<dd>Square root of 1/2; equivalently, 1 over the square root of 2, approximately 0.707.</dd>
<dt>{{jsxref("Math.SQRT2")}}</dt>
<dd>Square root of 2, approximately 1.414.</dd>
</dl>
<h2 id="Métodos">Métodos</h2>
<div class="note">
<p>Note that the trigonometric functions (<code>sin()</code>, <code>cos()</code>, <code>tan()</code>, <code>asin()</code>, <code>acos()</code>, <code>atan()</code>, <code>atan2()</code>) expect or return angles in radians. To convert radians to degrees, divide by <code>(Math.PI / 180)</code>, and multiply by this to convert the other way.</p>
</div>
<div class="note">
<p>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.</p>
</div>
<dl>
<dt>{{jsxref("Global_Objects/Math/abs", "Math.abs(x)")}}</dt>
<dd>Returns the absolute value of a number.</dd>
<dt>{{jsxref("Global_Objects/Math/acos", "Math.acos(x)")}}</dt>
<dd>Returns the arccosine of a number.</dd>
<dt>{{jsxref("Global_Objects/Math/acosh", "Math.acosh(x)")}}</dt>
<dd>Returns the hyperbolic arccosine of a number.</dd>
<dt>{{jsxref("Global_Objects/Math/asin", "Math.asin(x)")}}</dt>
<dd>Returns the arcsine of a number.</dd>
<dt>{{jsxref("Global_Objects/Math/asinh", "Math.asinh(x)")}}</dt>
<dd>Returns the hyperbolic arcsine of a number.</dd>
<dt>{{jsxref("Global_Objects/Math/atan", "Math.atan(x)")}}</dt>
<dd>Returns the arctangent of a number.</dd>
<dt>{{jsxref("Global_Objects/Math/atanh", "Math.atanh(x)")}}</dt>
<dd>Returns the hyperbolic arctangent of a number.</dd>
<dt>{{jsxref("Global_Objects/Math/atan2", "Math.atan2(y, x)")}}</dt>
<dd>Returns the arctangent of the quotient of its arguments.</dd>
<dt>{{jsxref("Global_Objects/Math/cbrt", "Math.cbrt(x)")}}</dt>
<dd>Returns the cube root of a number.</dd>
<dt>{{jsxref("Global_Objects/Math/ceil", "Math.ceil(x)")}}</dt>
<dd>Returns the smallest integer greater than or equal to a number.</dd>
<dt>{{jsxref("Global_Objects/Math/clz32", "Math.clz32(x)")}}</dt>
<dd>Returns the number of leading zeroes of a 32-bit integer.</dd>
<dt>{{jsxref("Global_Objects/Math/cos", "Math.cos(x)")}}</dt>
<dd>Returns the cosine of a number.</dd>
<dt>{{jsxref("Global_Objects/Math/cosh", "Math.cosh(x)")}}</dt>
<dd>Returns the hyperbolic cosine of a number.</dd>
<dt>{{jsxref("Global_Objects/Math/exp", "Math.exp(x)")}}</dt>
<dd>Returns E<sup>x</sup>, where <var>x</var> is the argument, and E is Euler's constant (2.718…), the base of the natural logarithm.</dd>
<dt>{{jsxref("Global_Objects/Math/expm1", "Math.expm1(x)")}}</dt>
<dd>Returns subtracting 1 from <code>exp(x)</code>.</dd>
<dt>{{jsxref("Global_Objects/Math/floor", "Math.floor(x)")}}</dt>
<dd>Returns the largest integer less than or equal to a number.</dd>
<dt>{{jsxref("Global_Objects/Math/fround", "Math.fround(x)")}}</dt>
<dd>Returns the nearest <a href="http://en.wikipedia.org/wiki/Single-precision_floating-point_format" title="link to the wikipedia page on single precision">single precision</a> float representation of a number.</dd>
<dt>{{jsxref("Global_Objects/Math/hypot", "Math.hypot([x[, y[, …]]])")}}</dt>
<dd>Returns the square root of the sum of squares of its arguments.</dd>
<dt>{{jsxref("Global_Objects/Math/imul", "Math.imul(x, y)")}}</dt>
<dd>Returns the result of a 32-bit integer multiplication.</dd>
<dt>{{jsxref("Global_Objects/Math/log", "Math.log(x)")}}</dt>
<dd>Returns the natural logarithm (log<sub>e</sub>, also ln) of a number.</dd>
<dt>{{jsxref("Global_Objects/Math/log1p", "Math.log1p(x)")}}</dt>
<dd>Returns the natural logarithm (log<sub>e</sub>, also ln) of <code>1 + x</code> for a number x.</dd>
<dt>{{jsxref("Global_Objects/Math/log10", "Math.log10(x)")}}</dt>
<dd>Returns the base 10 logarithm of a number.</dd>
<dt>{{jsxref("Global_Objects/Math/log2", "Math.log2(x)")}}</dt>
<dd>Returns the base 2 logarithm of a number.</dd>
<dt>{{jsxref("Global_Objects/Math/max", "Math.max([x[, y[, …]]])")}}</dt>
<dd>Returns the largest of zero or more numbers.</dd>
<dt>{{jsxref("Global_Objects/Math/min", "Math.min([x[, y[, …]]])")}}</dt>
<dd>Returns the smallest of zero or more numbers.</dd>
<dt>{{jsxref("Global_Objects/Math/pow", "Math.pow(x, y)")}}</dt>
<dd>Returns base to the exponent power, that is, <code>base<sup>exponent</sup></code>.</dd>
<dt>{{jsxref("Global_Objects/Math/random", "Math.random()")}}</dt>
<dd>Returns a pseudo-random number between 0 and 1.</dd>
<dt>{{jsxref("Global_Objects/Math/round", "Math.round(x)")}}</dt>
<dd>Returns the value of a number rounded to the nearest integer.</dd>
<dt>{{jsxref("Global_Objects/Math/sign", "Math.sign(x)")}}</dt>
<dd>Returns the sign of the x, indicating whether x is positive, negative or zero.</dd>
<dt>{{jsxref("Global_Objects/Math/sin", "Math.sin(x)")}}</dt>
<dd>Returns the sine of a number.</dd>
<dt>{{jsxref("Global_Objects/Math/sinh", "Math.sinh(x)")}}</dt>
<dd>Returns the hyperbolic sine of a number.</dd>
<dt>{{jsxref("Global_Objects/Math/sqrt", "Math.sqrt(x)")}}</dt>
<dd>Returns the positive square root of a number.</dd>
<dt>{{jsxref("Global_Objects/Math/tan", "Math.tan(x)")}}</dt>
<dd>Returns the tangent of a number.</dd>
<dt>{{jsxref("Global_Objects/Math/tanh", "Math.tanh(x)")}}</dt>
<dd>Returns the hyperbolic tangent of a number.</dd>
<dt><code>Math.toSource()</code> {{non-standard_inline}}</dt>
<dd>Returns the string <code>"Math"</code>.</dd>
<dt>{{jsxref("Global_Objects/Math/trunc", "Math.trunc(x)")}}</dt>
<dd>Returns the integral part of the number x, removing any fractional digits.</dd>
</dl>
<h2 id="Especificações">Especificações</h2>
<table class="standard-table">
<tbody>
<tr>
<th scope="col">Specification</th>
<th scope="col">Status</th>
<th scope="col">Comment</th>
</tr>
<tr>
<td>{{SpecName('ES1')}}</td>
<td>{{Spec2('ES1')}}</td>
<td>Initial definition. Implemented in JavaScript 1.1.</td>
</tr>
<tr>
<td>{{SpecName('ES5.1', '#sec-15.8', 'Math')}}</td>
<td>{{Spec2('ES5.1')}}</td>
<td> </td>
</tr>
<tr>
<td>{{SpecName('ES6', '#sec-math-object', 'Math')}}</td>
<td>{{Spec2('ES6')}}</td>
<td>New methods {{jsxref("Math.log10()", "log10()")}}, {{jsxref("Math.log2()", "log2()")}}, {{jsxref("Math.log1p()", "log1p()")}}, {{jsxref("Math.expm1()", "expm1()")}}, {{jsxref("Math.cosh()", "cosh()")}}, {{jsxref("Math.sinh()", "sinh()")}}, {{jsxref("Math.tanh()", "tanh()")}}, {{jsxref("Math.acosh()", "acosh()")}}, {{jsxref("Math.asinh()", "asinh()")}}, {{jsxref("Math.atanh()", "atanh()")}}, {{jsxref("Math.hypot()", "hypot()")}}, {{jsxref("Math.trunc()", "trunc()")}}, {{jsxref("Math.sign()", "sign()")}}, {{jsxref("Math.imul()", "imul()")}}, {{jsxref("Math.fround()", "fround()")}}, {{jsxref("Math.cbrt()", "cbrt()")}} and {{jsxref("Math.clz32()", "clz32()")}} added.</td>
</tr>
<tr>
<td>{{SpecName('ESDraft', '#sec-math-object', 'Math')}}</td>
<td>{{Spec2('ESDraft')}}</td>
<td> </td>
</tr>
</tbody>
</table>
<h2 id="Browser_compatibility">Browser compatibility</h2>
<div>{{CompatibilityTable}}</div>
<div id="compat-desktop">
<table class="compat-table">
<tbody>
<tr>
<th>Feature</th>
<th>Chrome</th>
<th>Firefox (Gecko)</th>
<th>Internet Explorer</th>
<th>Opera</th>
<th>Safari</th>
</tr>
<tr>
<td>Basic support</td>
<td>{{CompatVersionUnknown}}</td>
<td>{{CompatVersionUnknown}}</td>
<td>{{CompatVersionUnknown}}</td>
<td>{{CompatVersionUnknown}}</td>
<td>{{CompatVersionUnknown}}</td>
</tr>
</tbody>
</table>
</div>
<div id="compat-mobile">
<table class="compat-table">
<tbody>
<tr>
<th>Feature</th>
<th>Android</th>
<th>Chrome for Android</th>
<th>Firefox Mobile (Gecko)</th>
<th>IE Mobile</th>
<th>Opera Mobile</th>
<th>Safari Mobile</th>
</tr>
<tr>
<td>Basic support</td>
<td>{{CompatVersionUnknown}}</td>
<td>{{CompatVersionUnknown}}</td>
<td>{{CompatVersionUnknown}}</td>
<td>{{CompatVersionUnknown}}</td>
<td>{{CompatVersionUnknown}}</td>
<td>{{CompatVersionUnknown}}</td>
</tr>
</tbody>
</table>
</div>
<h2 id="See_also">See also</h2>
<ul>
<li>{{jsxref("Number")}}</li>
</ul>
|
