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+---
+title: Math.LOG2E
+slug: Web/JavaScript/Reference/Global_Objects/Math/LOG2E
+translation_of: Web/JavaScript/Reference/Global_Objects/Math/LOG2E
+---
+<div>
+ {{JSRef("Global_Objects", "Math")}}</div>
+<h2 id="Summary" name="Summary">概述</h2>
+<p><code><strong>Math.LOG2E</strong></code> 属性表示以 2 为底数，e 的对数，约为 1.442：</p>
+<p><math display="block"><semantics><mrow><mstyle mathvariant="monospace"><mi>Math.LOG2E</mi></mstyle><mo>=</mo><msub><mo lspace="0em" rspace="0em">log</mo><mn>2</mn></msub><mo stretchy="false">(</mo><mi>e</mi><mo stretchy="false">)</mo><mo>≈</mo><mn>1.442</mn></mrow><annotation encoding="TeX">\mathtt{\mi{Math.LOG2E}} = \log_2(e) \approx 1.442</annotation></semantics></math></p>
+<div>
+ {{js_property_attributes(0,0,0)}}</div>
+<h2 id="Description" name="Description">描述</h2>
+<p>由于 <code>LOG2E</code> 是 <code>Math</code> 的静态属性，所以应该像这样使用：<code>Math.LOG2E</code>，而不是作为你创建的 <code>Math</code> 对象的属性（<code>Math</code> 不是一个构造函数）。</p>
+<h2 id="Examples" name="Examples">示例</h2>
+<h3 id="Example:_Using_Math.LOG2E" name="Example:_Using_Math.LOG2E">例子：使用 <code>Math.LOG2E</code></h3>
+<p>下面的函数返回以 2 为底数，E 的对数：</p>
+<pre class="brush:js">function getLog2e() {
+   return Math.LOG2E
+}
+
+getLog2e() // 1.4426950408889634</pre>
+<h2 id="规范">规范</h2>
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">规范版本</th>
+   <th scope="col">规范状态</th>
+   <th scope="col">注解</th>
+  </tr>
+  <tr>
+   <td>ECMAScript 1st Edition. Implemented in JavaScript 1.0</td>
+   <td>Standard</td>
+   <td>Initial definition.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES5.1', '#sec-15.8.1.4', 'Math.LOG2E')}}</td>
+   <td>{{Spec2('ES5.1')}}</td>
+   <td> </td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES6', '#sec-math.log2e', 'Math.LOG2E')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td> </td>
+  </tr>
+ </tbody>
+</table>
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+<p>{{ CompatibilityTable() }}</p>
+<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" name="See_also">相关链接</h2>
+<ul>
+ <li>The {{jsxref("Global_Objects/Math", "Math")}} object it belongs to.</li>
+</ul>