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+---
+title: Math.log1p()
+slug: Web/JavaScript/Reference/Global_Objects/Math/log1p
+translation_of: Web/JavaScript/Reference/Global_Objects/Math/log1p
+---
+<div>
+<div>{{JSRef("Global_Objects", "Math")}}</div>
+</div>
+
+<h2 id="Summary" name="Summary">概述</h2>
+
+<p><code><strong>Math.log1p()</strong></code> 函数返回一个数字加1后的自然对数 (底为 <code>E</code>), 既<code>log(x+1)</code>.</p>
+
+<h2 id="Syntax" name="Syntax">语法</h2>
+
+<pre class="syntaxbox"><code>Math.log1p(<em>x</em>)</code></pre>
+
+<h3 id="Parameters" name="Parameters">参数</h3>
+
+<dl>
+ <dt><code>x</code></dt>
+ <dd>任意数字.</dd>
+</dl>
+
+<h2 id="Description" name="Description">描述</h2>
+
+<p>如果参数的值小于<code> -1</code>, 则返回 <code>NaN.</code></p>
+
+<p><code>函数 y = log(x+1) 的图形是这样的:</code></p>
+
+<p> <img alt="log(x+1)" src="https://mdn.mozillademos.org/files/6467/logx1.jpg" style="height: 300px; width: 400px;"></p>
+
+<p><strong style="font-size: 30px; font-weight: 700; letter-spacing: -1px; line-height: 30px;">示例</strong></p>
+
+<pre class="brush:js">Math.log1p(Math.E-1)  // 1
+Math.log1p(0)         // 0
+Math.log1p("0")       // 0
+Math.log1p(-1)        // -Infinity
+Math.log1p(-2)        // NaN
+Math.log1p("foo")     // NaN
+</pre>
+
+<h2 id="规范">规范</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('ES6', '#sec-math.log1p', 'Math.log1p')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td>Initial definition.</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>{{CompatNo}}</td>
+   <td>{{CompatGeckoDesktop("25")}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</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>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatGeckoMobile("25")}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="See_also" name="See_also">相关链接</h2>
+
+<ul>
+ <li>{{jsxref("Global_Objects/Math", "Math")}} 对象.</li>
+</ul>