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<article id="wikiArticle">
<div></div>
<p><strong><code>Math</code></strong> 是一个内置对象， 它具有数学常数和函数的属性和方法。不是一个函数对象。</p>
<h2 id="Description" name="Description" style="margin: 0px 0px 20px; padding: 0px; border: 0px; word-wrap: break-word; font-family: 'Open Sans', Arial, sans-serif; line-height: 1; font-size: 2.14285714285714rem; letter-spacing: -1px; color: rgb(77, 78, 83); background-color: rgb(255, 255, 255);">描述</h2>
<p style="margin: 0px 0px 24px; padding: 0px; border: 0px; color: rgb(77, 78, 83); font-family: 'Open Sans', Arial, sans-serif; font-size: 14px; line-height: 21px; background-color: rgb(255, 255, 255);">与其它全局对象不同的是, <code style="font-style: normal;">Math</code> 不是一个构造器.  <code>Math</code> 的所有属性和方法都是静态的. 你用到的常数pi可以用 <code>Math.PI</code> 表示,用 <code>x</code> 作参数 <span style="font-family: courier,andale mono,monospace;">Math.sin(x)</span><font face="Consolas, Monaco, Andale Mono, monospace">调用sin函数</font>. JavaScript中的常数, 是以全精度的实数定义的.</p>
<h2 id="Properties" name="Properties" style="margin: 0px 0px 20px; padding: 0px; border: 0px; word-wrap: break-word; font-family: 'Open Sans', Arial, sans-serif; line-height: 1; font-size: 2.14285714285714rem; letter-spacing: -1px; color: rgb(77, 78, 83); background-color: rgb(255, 255, 255);">属性</h2>
<dl>
<dt><a href="Reference/Global_Objects/Math/E" title="Math.E 属性表示自然对数的底数（或称为基数），e，约等于 2.718。"><code>Math.E</code></a></dt>
<dd>欧拉常数，也是自然对数的底数, 约等于 2.718.</dd>
<dt><a href="Reference/Global_Objects/Math/LN2" title="Math.LN2 属性表示 2 的自然对数，约为 0.693："><code>Math.LN2</code></a></dt>
<dd>2的自然对数, 约等于0.693.</dd>
<dt><a href="Reference/Global_Objects/Math/LN10" title="Math.LN10 属性表示 10 的自然对数，约为 2.302："><code>Math.LN10</code></a></dt>
<dd>10的自然对数, 约等于 2.303.</dd>
<dt><a href="Reference/Global_Objects/Math/LOG2E" title="Math.LOG2E 属性表示以 2 为底数，e 的对数，约为 1.442："><code>Math.LOG2E</code></a></dt>
<dd>以2为底E的对数, 约等于 1.443.</dd>
<dt><a href="Reference/Global_Objects/Math/LOG10E" title="Math.LOG10E 属性表示以 10 为底数，e 的对数，约为 0.434："><code>Math.LOG10E</code></a></dt>
<dd>以10为底E的对数, 约等于 0.434.</dd>
<dt><a href="Reference/Global_Objects/Math/PI" title="Math.PI 表示一个圆的周长与直径的比例，约为 3.14159："><code>Math.PI</code></a></dt>
<dd>圆周率，一个圆的周长和直径之比，约等于 3.14159.</dd>
<dt><a href="Reference/Global_Objects/Math/SQRT1_2" title="Math.SQRT1_2 属性表示 1/2 的平方根，约为 0.707："><code>Math.SQRT1_2</code></a></dt>
<dd>1/2的平方根, 约等于 0.707.</dd>
<dt><a href="Reference/Global_Objects/Math/SQRT2" title="Math.SQRT2 属性表示 2 的平方根，约为 1.414："><code>Math.SQRT2</code></a></dt>
<dd>2的平方根,约等于 1.414.</dd>
<dt><div class="blockIndicator inheritsbox template-jsOverrides">
<div><span style="font-weight: 700;">Properties inherited from <a href="https://developer.mozilla.orgReference/Global_Objects/Object"><code>Object</code></a>:</span></div>
<div><a class="internal" href="https://developer.mozilla.orgReference/Global_Objects/Object/Constructor"><code>constructor</code></a>, <a class="internal" href="https://developer.mozilla.orgReference/Global_Objects/Object/Parent"><code>__parent__</code></a>, <a class="internal" href="https://developer.mozilla.orgReference/Global_Objects/Object/Proto"><code>__proto__</code></a></div>
</div></dt>
</dl>
<h2 id="Methods" name="Methods" style="margin: 0px 0px 20px; padding: 0px; border: 0px; word-wrap: break-word; font-family: 'Open Sans', Arial, sans-serif; line-height: 1; font-size: 2.14285714285714rem; letter-spacing: -1px; color: rgb(77, 78, 83); background-color: rgb(255, 255, 255);">方法</h2>
<div class="note">
<p style="margin: 0px; padding: 0px; border: 0px;">需要注意的是三角函数（<code style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-weight: inherit; font-family: Courier, 'Andale Mono', monospace;">sin()</code>, <code style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-weight: inherit; font-family: Courier, 'Andale Mono', monospace;">cos()</code>, <code style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-weight: inherit; font-family: Courier, 'Andale Mono', monospace;">tan()</code>,<code style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-weight: inherit; font-family: Courier, 'Andale Mono', monospace;">asin()</code>, <code style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-weight: inherit; font-family: Courier, 'Andale Mono', monospace;">acos()</code>, <code style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-weight: inherit; font-family: Courier, 'Andale Mono', monospace;">atan()</code>, <code style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-weight: inherit; font-family: Courier, 'Andale Mono', monospace;">atan2()）是以弧度返回值的。可以通过除法（</code>Math.PI / 180）把弧度转换为角度，也可以通过其他方法来转换。</p>
</div>
<div class="note">
<p style="margin: 0px; padding: 0px; border: 0px;">需要注意的是很多数学函数都有一个精度，并且精度在不同环境下也是不相同的。这就意味着不同的浏览器会给出不同的结果，甚至相同的 JS 引擎在不同的OS或者架构下也会给出不同的结果。</p>
</div>
<dl>
<dt><a href="Reference/Global_Objects/Math/abs" title="Math.abs(x) 函数返回指定数字 “x“ 的绝对值。如下："><code>Math.abs(x)</code></a></dt>
<dd>返回x的绝对值.</dd>
<dt><a href="Reference/Global_Objects/Math/acos" title="Math.acos() 返回一个数的反余弦值（单位为弧度），即："><code>Math.acos(x)</code></a></dt>
<dd>返回x的反余弦值.</dd>
<dt><a class="new" href="Reference/Global_Objects/Math/acosh" rel="nofollow" title="此页面仍未被本地化, 期待您的翻译!"><code>Math.acosh(x)</code></a> <span title="这是一个实验性的 API，请尽量不要在生产环境中使用它。"><i class="icon-beaker"> </i></span></dt>
<dd>返回x的反双曲余弦值.</dd>
<dt><a href="Reference/Global_Objects/Math/asin" title="Math.asin() 方法返回一个数值的反正弦（单位为弧度），即："><code>Math.asin(x)</code></a></dt>
<dd>返回x的反正弦值.</dd>
<dt><a href="Reference/Global_Objects/Math/asinh" title="Math.asinh() 函数返回给定数字的反双曲正弦值, 即："><code>Math.asinh(x)</code></a> <span title="这是一个实验性的 API，请尽量不要在生产环境中使用它。"><i class="icon-beaker"> </i></span></dt>
<dd>返回x的反双曲正弦值.</dd>
<dt><a href="Reference/Global_Objects/Math/atan" title="Math.atan() 函数返回一个数值的反正切（以弧度为单位），即："><code>Math.atan(x)</code></a></dt>
<dd><span style="font-size: 14.4444446563721px; line-height: 23.3333339691162px;">以介于 -PI/2 与 PI/2 弧度之间的数值来返回 x 的反正切值.</span></dd>
<dt><a href="Reference/Global_Objects/Math/atanh" title="Math.atanh() 函数返回一个数值反双曲正切值, 即："><code>Math.atanh(x)</code></a> <span title="这是一个实验性的 API，请尽量不要在生产环境中使用它。"><i class="icon-beaker"> </i></span></dt>
<dd>返回 x 的反双曲正切值<span style="font-size: 14.4444446563721px; line-height: 23.3333339691162px;">.</span></dd>
<dt><a href="Reference/Global_Objects/Math/atan2" title="Math.atan2() 返回其参数比值的反正切值。"><code>Math.atan2(y, x)</code></a></dt>
<dd>返回 y/x 的反正切值.</dd>
<dt><a href="Reference/Global_Objects/Math/cbrt" title="Math.cbrt() 函数返回任意数字的立方根."><code>Math.cbrt(x)</code></a> <span title="这是一个实验性的 API，请尽量不要在生产环境中使用它。"><i class="icon-beaker"> </i></span></dt>
<dd>返回x的立方根.</dd>
<dt><a href="Reference/Global_Objects/Math/ceil" title="Math.ceil() 函数返回大于或等于一个给定数字的最小整数。"><code>Math.ceil(x)</code></a></dt>
<dd>返回x向上取整后的值.</dd>
<dt><a href="Reference/Global_Objects/Math/clz32" title="Math.clz32() 函数返回一个数字在转换成 32 无符号整形数字的二进制形式后, 开头的 0 的个数, 比如 1000000 转换成 32 位无符号整形数字的二进制形式后是 00000000000011110100001001000000, 开头的 0 的个数是 12 个, 则 Math.clz32(1000000) 返回 12."><code>Math.clz32(x)</code></a> <span title="这是一个实验性的 API，请尽量不要在生产环境中使用它。"><i class="icon-beaker"> </i></span></dt>
<dd>返回一个32位整数的前导零的数量。</dd>
<dt><a href="Reference/Global_Objects/Math/cos" title="Math.cos() 函数返回一个数值的余弦值。"><code>Math.cos(x)</code></a></dt>
<dd>返回x的余弦值.</dd>
<dt><a href="Reference/Global_Objects/Math/cosh" title="Math.cosh() 函数返回数值的双曲余弦函数, 可用 constant e 表示:"><code>Math.cosh(x)</code></a> <span title="这是一个实验性的 API，请尽量不要在生产环境中使用它。"><i class="icon-beaker"> </i></span></dt>
<dd>返回x的<span style="">双曲余弦值</span>.</dd>
<dt><a href="Reference/Global_Objects/Math/exp" title="Math.exp() 函数返回 ex，x 表示参数，e 是欧拉常数（Euler's constant），自然对数的底数。"><code>Math.exp(x)</code></a></dt>
<dd>返回 E<span style="position: relative; top: -0.15em; vertical-align: top;">x</span>, 当x为参数,  E 是欧拉常数 (2.718...), 自然对数的底.</dd>
<dt><a href="Reference/Global_Objects/Math/expm1" title="Math.expm1() 函数返回 Ex - 1, 其中 x 是该函数的参数, E 是自然对数的底数 2.718281828459045."><code>Math.expm1(x)</code></a> <span title="这是一个实验性的 API，请尽量不要在生产环境中使用它。"><i class="icon-beaker"> </i></span></dt>
<dd>返回 exp(x)-1 的值.</dd>
<dt><a href="Reference/Global_Objects/Math/floor" title="Math.floor() 返回小于或等于一个给定数字的最大整数。"><code>Math.floor(x)</code></a></dt>
<dd>返回小于x的最大整数。</dd>
<dt><a href="Reference/Global_Objects/Math/fround" title="Math.fround() 可以将任意的数字转换为离它最近的单精度浮点数形式的数字。"><code>Math.fround(x)</code></a> <span title="这是一个实验性的 API，请尽量不要在生产环境中使用它。"><i class="icon-beaker"> </i></span></dt>
<dd>返回数字的最接近的单精度浮点型表示。</dd>
<dt><a href="Reference/Global_Objects/Math/hypot" title="Math.hypot() 函数返回它的所有参数的平方和的平方根，即："><code>Math.hypot([x[,y[,…]]])</code></a> <span title="这是一个实验性的 API，请尽量不要在生产环境中使用它。"><i class="icon-beaker"> </i></span></dt>
<dd>返回其参数平方和的平方根。</dd>
<dt><a href="Reference/Global_Objects/Math/imul" title="该函数返回两个参数的类C的32位整数乘法运算的运算结果."><code>Math.imul(x)</code></a> <span title="这是一个实验性的 API，请尽量不要在生产环境中使用它。"><i class="icon-beaker"> </i></span></dt>
<dd>返回32位整数乘法的结果。</dd>
<dt><a href="Reference/Global_Objects/Math/log" title="Math.log() 函数返回一个数的自然对数，即："><code>Math.log(x)</code></a></dt>
<dd>返回一个数的自然对数（log<sub>e， </sub>即ln）。</dd>
<dt><a href="Reference/Global_Objects/Math/log1p" title="Math.log1p() 函数返回一个数字加1后的自然对数 (底为 E), 既log(x+1)."><code>Math.log1p(x)</code></a> <span title="这是一个实验性的 API，请尽量不要在生产环境中使用它。"><i class="icon-beaker"> </i></span></dt>
<dd><span class="sentence" id="mt1">返回 1 加上一个数字的的自然对数</span>（log<sub>e， </sub>即ln）。</dd>
<dt><a href="Reference/Global_Objects/Math/log10" title="Math.log10() 函数返回一个数字以 10 为底的对数."><code>Math.log10(x)</code></a> <span title="这是一个实验性的 API，请尽量不要在生产环境中使用它。"><i class="icon-beaker"> </i></span></dt>
<dd>返回以10为底数的x的对数。</dd>
<dt><a href="Reference/Global_Objects/Math/log2" title="Math.log2() 函数返回一个数字以 2 为底的对数."><code>Math.log2(x)</code></a> <span title="这是一个实验性的 API，请尽量不要在生产环境中使用它。"><i class="icon-beaker"> </i></span></dt>
<dd>返回以2为底数的x的对数。</dd>
<dt><a href="Reference/Global_Objects/Math/max" title="Math.max() 函数返回一组数中的最大值。"><code>Math.max([x[,y[,…]]])</code></a></dt>
<dd>返回0个到多个数值中最大值.</dd>
<dt><a href="Reference/Global_Objects/Math/min" title="Math.min() 返回零个或更多个数值的最小值。"><code>Math.min([x[,y[,…]]])</code></a></dt>
<dd>返回0个到多个数值中最小值.</dd>
<dt><a href="Reference/Global_Objects/Math/pow" title="Math.pow() 函数返回基数（base）的指数（exponent）次幂，即 baseexponent。"><code>Math.pow(x,y)</code></a></dt>
<dd>返回x的y次幂.</dd>
<dt><a href="Reference/Global_Objects/Math/random" title="Math.random() 函数返回一个浮点,  伪随机数在范围[0，1)，也就是说，从0（包括0）往上，但是不包括1（排除1），然后您可以缩放到所需的范围。实现将初始种子选择到随机数生成算法;它不能被用户选择或重置。"><code>Math.random()</code></a></dt>
<dd>返回0到1之间的伪随机数.</dd>
<dt><a href="Reference/Global_Objects/Math/round" title="Math.round() 函数返回一个数字四舍五入后最接近的整数。"><code>Math.round(x)</code></a></dt>
<dd>返回四舍五入后的整数.</dd>
<dt><a href="Reference/Global_Objects/Math/sign" title="Math.sign() 函数返回一个数字的符号, 指示数字是正数，负数还是零。"><code>Math.sign(x)</code></a> <span title="这是一个实验性的 API，请尽量不要在生产环境中使用它。"><i class="icon-beaker"> </i></span></dt>
<dd>返回x的符号函数, 判定x是正数,负数还是0.</dd>
<dt><a href="Reference/Global_Objects/Math/sin" title="Math.sin() 函数返回一个数值的正弦值。"><code>Math.sin(x)</code></a></dt>
<dd>返回正弦值.</dd>
<dt><a href="Reference/Global_Objects/Math/sinh" title="Math.sinh() 函数返回一个数字(单位为角度)的双曲正弦值."><code>Math.sinh(x)</code></a> <span title="这是一个实验性的 API，请尽量不要在生产环境中使用它。"><i class="icon-beaker"> </i></span></dt>
<dd>返回x的双曲正弦值.</dd>
<dt><a href="Reference/Global_Objects/Math/sqrt" title="Math.sqrt() 函数返回一个数的平方根，即："><code>Math.sqrt(x)</code></a></dt>
<dd>返回x的平方根.</dd>
<dt><a href="Reference/Global_Objects/Math/tan" title="Math.tan() 方法返回一个数值的正切值。"><code>Math.tan(x)</code></a></dt>
<dd>返回x的正切值.</dd>
<dt><a href="Reference/Global_Objects/Math/tanh" title="Math.tanh() 函数将会返回一个数的双曲正切函数值，计算如下:"><code>Math.tanh(x)</code></a> <span title="这是一个实验性的 API，请尽量不要在生产环境中使用它。"><i class="icon-beaker"> </i></span></dt>
<dd>返回x的双曲正切值.</dd>
<dt><code>Math.toSource()</code> <span class="icon-only-inline" title="This API has not been standardized."><i class="icon-warning-sign"> </i></span></dt>
<dd>返回字符串 <code>"Math"</code>.</dd>
<dt><a href="Reference/Global_Objects/Math/trunc" title="Math.trunc() 方法会将数字的小数部分去掉，只保留整数部分。"><code>Math.trunc(x)</code></a> <span title="这是一个实验性的 API，请尽量不要在生产环境中使用它。"><i class="icon-beaker"> </i></span></dt>
<dd>返回x的整数部分,去除小数.</dd>
<dt><div class="blockIndicator inheritsbox template-jsOverrides">
<div><span style="font-weight: 700;">Methods inherited from <a href="https://developer.mozilla.orgReference/Global_Objects/Object"><code>Object</code></a>:</span></div>
<div><a class="internal new" href="https://developer.mozilla.orgReference/Global_Objects/Object/DefineGetter" rel="nofollow"><code>__defineGetter__</code></a>, <a class="internal new" href="https://developer.mozilla.orgReference/Global_Objects/Object/DefineSetter" rel="nofollow"><code>__defineSetter__</code></a>, <a class="internal" href="https://developer.mozilla.orgReference/Global_Objects/Object/HasOwnProperty"><code>hasOwnProperty</code></a>, <a class="internal" href="https://developer.mozilla.orgReference/Global_Objects/Object/IsPrototypeOf"><code>isPrototypeOf</code></a>, <a class="internal" href="https://developer.mozilla.orgReference/Global_Objects/Object/LookupGetter"><code>__lookupGetter__</code></a>, <a class="internal new" href="https://developer.mozilla.orgReference/Global_Objects/Object/LookupSetter" rel="nofollow"><code>__lookupSetter__</code></a>, <a class="internal" href="https://developer.mozilla.orgReference/Global_Objects/Object/NoSuchMethod"><code>__noSuchMethod__</code></a>, <a class="internal" href="https://developer.mozilla.orgReference/Global_Objects/Object/PropertyIsEnumerable"><code>propertyIsEnumerable</code></a>, <a class="internal" href="https://developer.mozilla.orgReference/Global_Objects/Object/ToSource"><code>toSource</code></a>, <a class="internal" href="https://developer.mozilla.orgReference/Global_Objects/Object/ToLocaleString"><code>toLocaleString</code></a>, <a class="internal" href="https://developer.mozilla.orgReference/Global_Objects/Object/ToString"><code>toString</code></a>, <a class="internal" href="https://developer.mozilla.orgReference/Global_Objects/Object/Unwatch"><code>unwatch</code></a>, <a class="internal" href="https://developer.mozilla.orgReference/Global_Objects/Object/ValueOf"><code>valueOf</code></a>, <a class="internal" href="https://developer.mozilla.orgReference/Global_Objects/Object/Watch"><code>watch</code></a></div>
</div></dt>
</dl>
<h2 id="Specifications" name="Specifications" style="margin: 0px 0px 20px; padding: 0px; border: 0px; word-wrap: break-word; font-family: 'Open Sans', Arial, sans-serif; line-height: 1; font-size: 2.14285714285714rem; letter-spacing: -1px; color: rgb(77, 78, 83); background-color: rgb(255, 255, 255);">规范</h2>
<table class="standard-table" style="background-color: #ffffff; border-collapse: collapse; border: 2px solid #ffffff; color: #4d4e53; font-family: open sans,arial,sans-serif; font-size: 14px; line-height: 21px; margin: 0px 0px 24px; padding: 0px;">
<tbody>
<tr style="margin: 0px; padding: 0px; border: 0px;">
<th scope="col" style="margin: 0px; padding: 2px 8px 4px; border-width: 2px; border-style: solid; border-color: rgb(255, 255, 255) rgb(255, 255, 255) rgb(212, 221, 228); font-style: inherit; font-family: 'Open Sans Light', Helvetica, Arial, sans-serif; background: rgba(212, 221, 228, 0.498039);">规范</th>
<th scope="col" style="margin: 0px; padding: 2px 8px 4px; border-width: 2px; border-style: solid; border-color: rgb(255, 255, 255) rgb(255, 255, 255) rgb(212, 221, 228); font-style: inherit; font-family: 'Open Sans Light', Helvetica, Arial, sans-serif; background: rgba(212, 221, 228, 0.498039);">状态</th>
<th scope="col" style="margin: 0px; padding: 2px 8px 4px; border-width: 2px; border-style: solid; border-color: rgb(255, 255, 255) rgb(255, 255, 255) rgb(212, 221, 228); font-style: inherit; font-family: 'Open Sans Light', Helvetica, Arial, sans-serif; background: rgba(212, 221, 228, 0.498039);">说明</th>
</tr>
<tr style="margin: 0px; padding: 0px; border: 0px;">
<td style="margin: 0px; padding: 6px 8px; border: 2px solid rgb(255, 255, 255); box-shadow: rgba(212, 221, 228, 0.498039) 0px -1px 0px 0px inset; background-color: rgba(212, 221, 228, 0.14902);">ECMAScript 1st Edition.</td>
<td style="margin: 0px; padding: 6px 8px; border: 2px solid rgb(255, 255, 255); box-shadow: rgba(212, 221, 228, 0.498039) 0px -1px 0px 0px inset; background-color: rgba(212, 221, 228, 0.14902);"><span class="spec-Standard">Standard</span></td>
<td style="margin: 0px; padding: 6px 8px; border: 2px solid rgb(255, 255, 255); box-shadow: rgba(212, 221, 228, 0.498039) 0px -1px 0px 0px inset; background-color: rgba(212, 221, 228, 0.14902);">初始定义。在 JavaScript 1.1 中实现。</td>
</tr>
<tr style="margin: 0px; padding: 0px; border: 0px;">
<td style="margin: 0px; padding: 6px 8px; border: 2px solid rgb(255, 255, 255); box-shadow: rgba(212, 221, 228, 0.498039) 0px -1px 0px 0px inset; background-color: rgba(212, 221, 228, 0.247059);"><a class="external" href="https://www.ecma-international.org/ecma-262/5.1/#sec-15.8" hreflang="en" lang="en" rel="noopener">ECMAScript 5.1 (ECMA-262)<br/><small lang="zh-CN">Math</small></a></td>
<td style="margin: 0px; padding: 6px 8px; border: 2px solid rgb(255, 255, 255); box-shadow: rgba(212, 221, 228, 0.498039) 0px -1px 0px 0px inset; background-color: rgba(212, 221, 228, 0.247059);"><span class="spec-Standard">Standard</span></td>
<td style="margin: 0px; padding: 6px 8px; border: 2px solid rgb(255, 255, 255); box-shadow: rgba(212, 221, 228, 0.498039) 0px -1px 0px 0px inset; background-color: rgba(212, 221, 228, 0.247059);"> </td>
</tr>
<tr style="margin: 0px; padding: 0px; border: 0px;">
<td style="margin: 0px; padding: 6px 8px; border: 2px solid rgb(255, 255, 255); box-shadow: rgba(212, 221, 228, 0.498039) 0px -1px 0px 0px inset; background-color: rgba(212, 221, 228, 0.14902);"><a class="external" href="https://www.ecma-international.org/ecma-262/6.0/#sec-math-object" hreflang="en" lang="en" rel="noopener">ECMAScript 2015 (6th Edition, ECMA-262)<br/><small lang="zh-CN">Math</small></a></td>
<td style="margin: 0px; padding: 6px 8px; border: 2px solid rgb(255, 255, 255); box-shadow: rgba(212, 221, 228, 0.498039) 0px -1px 0px 0px inset; background-color: rgba(212, 221, 228, 0.14902);"><span class="spec-Standard">Standard</span></td>
<td style="margin: 0px; padding: 6px 8px; border: 2px solid rgb(255, 255, 255); box-shadow: rgba(212, 221, 228, 0.498039) 0px -1px 0px 0px inset; background-color: rgba(212, 221, 228, 0.14902);">New methods <a href="Reference/Global_Objects/Math/log10" title="Math.log10() 函数返回一个数字以 10 为底的对数."><code>log10()</code></a>, <a href="Reference/Global_Objects/Math/log2" title="Math.log2() 函数返回一个数字以 2 为底的对数."><code>log2()</code></a>, <a href="Reference/Global_Objects/Math/log1p" title="Math.log1p() 函数返回一个数字加1后的自然对数 (底为 E), 既log(x+1)."><code>log1p()</code></a>, <a href="Reference/Global_Objects/Math/expm1" title="Math.expm1() 函数返回 Ex - 1, 其中 x 是该函数的参数, E 是自然对数的底数 2.718281828459045."><code>expm1()</code></a>, <a href="Reference/Global_Objects/Math/cosh" title="Math.cosh() 函数返回数值的双曲余弦函数, 可用 constant e 表示:"><code>cosh()</code></a>, <a href="Reference/Global_Objects/Math/sinh" title="Math.sinh() 函数返回一个数字(单位为角度)的双曲正弦值."><code>sinh()</code></a>, <a href="Reference/Global_Objects/Math/tanh" title="Math.tanh() 函数将会返回一个数的双曲正切函数值，计算如下:"><code>tanh()</code></a>, <a class="new" href="Reference/Global_Objects/Math/acosh" rel="nofollow" title="此页面仍未被本地化, 期待您的翻译!"><code>acosh()</code></a>, <a href="Reference/Global_Objects/Math/asinh" title="Math.asinh() 函数返回给定数字的反双曲正弦值, 即："><code>asinh()</code></a>, <a href="Reference/Global_Objects/Math/atanh" title="Math.atanh() 函数返回一个数值反双曲正切值, 即："><code>atanh()</code></a>, <a href="Reference/Global_Objects/Math/hypot" title="Math.hypot() 函数返回它的所有参数的平方和的平方根，即："><code>hypot()</code></a>, <a href="Reference/Global_Objects/Math/trunc" title="Math.trunc() 方法会将数字的小数部分去掉，只保留整数部分。"><code>trunc()</code></a>, <a href="Reference/Global_Objects/Math/sign" title="Math.sign() 函数返回一个数字的符号, 指示数字是正数，负数还是零。"><code>sign()</code></a>, <a href="Reference/Global_Objects/Math/imul" title="该函数返回两个参数的类C的32位整数乘法运算的运算结果."><code>imul()</code></a>, <a href="Reference/Global_Objects/Math/fround" title="Math.fround() 可以将任意的数字转换为离它最近的单精度浮点数形式的数字。"><code>fround()</code></a>, <a href="Reference/Global_Objects/Math/cbrt" title="Math.cbrt() 函数返回任意数字的立方根."><code>cbrt()</code></a> and <a href="Reference/Global_Objects/Math/clz32" title="Math.clz32() 函数返回一个数字在转换成 32 无符号整形数字的二进制形式后, 开头的 0 的个数, 比如 1000000 转换成 32 位无符号整形数字的二进制形式后是 00000000000011110100001001000000, 开头的 0 的个数是 12 个, 则 Math.clz32(1000000) 返回 12."><code>clz32()</code></a> added.</td>
</tr>
</tbody>
</table>
<h2 id="Browser_compatibility" name="Browser_compatibility" style="margin: 0px 0px 20px; padding: 0px; border: 0px; word-wrap: break-word; font-family: 'Open Sans', Arial, sans-serif; line-height: 1; font-size: 2.14285714285714rem; letter-spacing: -1px; color: rgb(77, 78, 83); background-color: rgb(255, 255, 255);">浏览器兼容性</h2>
<div style="margin: 0px; padding: 0px; border: 0px; color: rgb(77, 78, 83); font-family: 'Open Sans', Arial, sans-serif; font-size: 14px; line-height: 21px; background-color: rgb(255, 255, 255);"><div class="blockIndicator warning"><strong><a class="external" href="https://github.com/mdn/browser-compat-data" rel="noopener">We're converting our compatibility data into a machine-readable JSON format</a></strong>.
This compatibility table still uses the old format,
because we haven't yet converted the data it contains.
<strong><a class="new" href="/zh-CN/docs/MDN/Contribute/Structures/Compatibility_tables" rel="nofollow">Find out how you can help!</a></strong></div>
<div class="htab">
<a id="AutoCompatibilityTable" name="AutoCompatibilityTable"></a>
<ul>
<li class="selected"><a>Desktop</a></li>
<li><a>Mobile</a></li>
</ul>
</div></div>
<div id="compat-desktop" style="margin: 0px; padding: 0px; border: 0px; color: rgb(77, 78, 83); font-family: 'Open Sans', Arial, sans-serif; font-size: 14px; line-height: 21px; background-color: rgb(255, 255, 255);">
<table class="compat-table" style="border-collapse: collapse; border: 1px solid transparent; margin: 0px; padding: 0px;">
<tbody>
<tr style="margin: 0px; padding: 0px; border: 0px;">
<th style="margin: 0px; padding: 2px 4px 8px; border: 1px solid rgba(212, 221, 228, 0); font-style: inherit; font-weight: 200; font-family: 'Open Sans Light', Helvetica, Arial, sans-serif; font-size: 16px; line-height: 16px; background: 0px 0px;">Feature</th>
<th style="margin: 0px; padding: 2px 4px 8px; border: 1px solid rgba(212, 221, 228, 0); font-style: inherit; font-weight: 200; font-family: 'Open Sans Light', Helvetica, Arial, sans-serif; font-size: 16px; line-height: 16px; background: 0px 0px;">Chrome</th>
<th style="margin: 0px; padding: 2px 4px 8px; border: 1px solid rgba(212, 221, 228, 0); font-style: inherit; font-weight: 200; font-family: 'Open Sans Light', Helvetica, Arial, sans-serif; font-size: 16px; line-height: 16px; background: 0px 0px;">Firefox (Gecko)</th>
<th style="margin: 0px; padding: 2px 4px 8px; border: 1px solid rgba(212, 221, 228, 0); font-style: inherit; font-weight: 200; font-family: 'Open Sans Light', Helvetica, Arial, sans-serif; font-size: 16px; line-height: 16px; background: 0px 0px;">Internet Explorer</th>
<th style="margin: 0px; padding: 2px 4px 8px; border: 1px solid rgba(212, 221, 228, 0); font-style: inherit; font-weight: 200; font-family: 'Open Sans Light', Helvetica, Arial, sans-serif; font-size: 16px; line-height: 16px; background: 0px 0px;">Opera</th>
<th style="margin: 0px; padding: 2px 4px 8px; border: 1px solid rgba(212, 221, 228, 0); font-style: inherit; font-weight: 200; font-family: 'Open Sans Light', Helvetica, Arial, sans-serif; font-size: 16px; line-height: 16px; background: 0px 0px;">Safari</th>
</tr>
<tr style="margin: 0px; padding: 0px; border: 0px;">
<td style="margin: 0px; padding: 5px; border: 1px solid rgba(212, 221, 228, 0.247059); font-size: 12px; vertical-align: top; word-wrap: break-word; background-clip: initial;">Basic support</td>
<td style="margin: 0px; padding: 5px; border: 1px solid rgba(212, 221, 228, 0.247059); font-size: 12px; vertical-align: top; word-wrap: break-word; background-clip: initial;"><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
<td style="margin: 0px; padding: 5px; border: 1px solid rgba(212, 221, 228, 0.247059); font-size: 12px; vertical-align: top; word-wrap: break-word; background-clip: initial;"><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
<td style="margin: 0px; padding: 5px; border: 1px solid rgba(212, 221, 228, 0.247059); font-size: 12px; vertical-align: top; word-wrap: break-word; background-clip: initial;"><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
<td style="margin: 0px; padding: 5px; border: 1px solid rgba(212, 221, 228, 0.247059); font-size: 12px; vertical-align: top; word-wrap: break-word; background-clip: initial;"><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
<td style="margin: 0px; padding: 5px; border: 1px solid rgba(212, 221, 228, 0.247059); font-size: 12px; vertical-align: top; word-wrap: break-word; background-clip: initial;"><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
</tr>
</tbody>
</table>
</div>
<div id="compat-mobile" style="margin: 0px; padding: 0px; border: 0px; color: rgb(77, 78, 83); font-family: 'Open Sans', Arial, sans-serif; font-size: 14px; line-height: 21px; background-color: rgb(255, 255, 255);">
<table class="compat-table" style="border-collapse: collapse; border: 1px solid transparent; margin: 0px; padding: 0px;">
<tbody>
<tr style="margin: 0px; padding: 0px; border: 0px;">
<th style="margin: 0px; padding: 2px 4px 8px; border: 1px solid rgba(212, 221, 228, 0); font-style: inherit; font-weight: 200; font-family: 'Open Sans Light', Helvetica, Arial, sans-serif; font-size: 16px; line-height: 16px; background: 0px 0px;">Feature</th>
<th style="margin: 0px; padding: 2px 4px 8px; border: 1px solid rgba(212, 221, 228, 0); font-style: inherit; font-weight: 200; font-family: 'Open Sans Light', Helvetica, Arial, sans-serif; font-size: 16px; line-height: 16px; background: 0px 0px;">Android</th>
<th style="margin: 0px; padding: 2px 4px 8px; border: 1px solid rgba(212, 221, 228, 0); font-style: inherit; font-weight: 200; font-family: 'Open Sans Light', Helvetica, Arial, sans-serif; font-size: 16px; line-height: 16px; background: 0px 0px;">Chrome for Android</th>
<th style="margin: 0px; padding: 2px 4px 8px; border: 1px solid rgba(212, 221, 228, 0); font-style: inherit; font-weight: 200; font-family: 'Open Sans Light', Helvetica, Arial, sans-serif; font-size: 16px; line-height: 16px; background: 0px 0px;">Firefox Mobile (Gecko)</th>
<th style="margin: 0px; padding: 2px 4px 8px; border: 1px solid rgba(212, 221, 228, 0); font-style: inherit; font-weight: 200; font-family: 'Open Sans Light', Helvetica, Arial, sans-serif; font-size: 16px; line-height: 16px; background: 0px 0px;">IE Mobile</th>
<th style="margin: 0px; padding: 2px 4px 8px; border: 1px solid rgba(212, 221, 228, 0); font-style: inherit; font-weight: 200; font-family: 'Open Sans Light', Helvetica, Arial, sans-serif; font-size: 16px; line-height: 16px; background: 0px 0px;">Opera Mobile</th>
<th style="margin: 0px; padding: 2px 4px 8px; border: 1px solid rgba(212, 221, 228, 0); font-style: inherit; font-weight: 200; font-family: 'Open Sans Light', Helvetica, Arial, sans-serif; font-size: 16px; line-height: 16px; background: 0px 0px;">Safari Mobile</th>
</tr>
<tr style="margin: 0px; padding: 0px; border: 0px;">
<td style="margin: 0px; padding: 5px; border: 1px solid rgba(212, 221, 228, 0.247059); font-size: 12px; vertical-align: top; word-wrap: break-word; background-clip: initial;">Basic support</td>
<td style="margin: 0px; padding: 5px; border: 1px solid rgba(212, 221, 228, 0.247059); font-size: 12px; vertical-align: top; word-wrap: break-word; background-clip: initial;"><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
<td style="margin: 0px; padding: 5px; border: 1px solid rgba(212, 221, 228, 0.247059); font-size: 12px; vertical-align: top; word-wrap: break-word; background-clip: initial;"><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
<td style="margin: 0px; padding: 5px; border: 1px solid rgba(212, 221, 228, 0.247059); font-size: 12px; vertical-align: top; word-wrap: break-word; background-clip: initial;"><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
<td style="margin: 0px; padding: 5px; border: 1px solid rgba(212, 221, 228, 0.247059); font-size: 12px; vertical-align: top; word-wrap: break-word; background-clip: initial;"><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
<td style="margin: 0px; padding: 5px; border: 1px solid rgba(212, 221, 228, 0.247059); font-size: 12px; vertical-align: top; word-wrap: break-word; background-clip: initial;"><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
<td style="margin: 0px; padding: 5px; border: 1px solid rgba(212, 221, 228, 0.247059); font-size: 12px; vertical-align: top; word-wrap: break-word; background-clip: initial;"><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
</tr>
</tbody>
</table>
</div>
<h2 id="See_also" name="See_also" style="margin: 0px 0px 20px; padding: 0px; border: 0px; word-wrap: break-word; font-family: 'Open Sans', Arial, sans-serif; line-height: 1; font-size: 2.14285714285714rem; letter-spacing: -1px; color: rgb(77, 78, 83); background-color: rgb(255, 255, 255);">参见</h2>
<ul style="margin: 0px 0px 24px; padding: 0px 0px 0px 40px; border: 0px; color: rgb(77, 78, 83); font-family: 'Open Sans', Arial, sans-serif; font-size: 14px; line-height: 21px; background-color: rgb(255, 255, 255);">
<li style="margin: 0px 0px 6px; padding: 0px; border: 0px;"><a href="Reference/Global_Objects/Number" title="JavaScript 的 Number 对象是经过封装的能让你处理数字值的对象。Number 对象由 Number() 构造器创建。"><code>Number</code></a></li>
</ul>
<div style="margin: 0px; padding: 0px; border: 0px; color: rgb(77, 78, 83); font-family: 'Open Sans', Arial, sans-serif; font-size: 14px; line-height: 21px; background-color: rgb(255, 255, 255);"> </div>
<dl>
</dl>
</article>
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