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+---
+title: Number.EPSILON
+slug: Web/JavaScript/Reference/Global_Objects/Number/EPSILON
+translation_of: Web/JavaScript/Reference/Global_Objects/Number/EPSILON
+---
+<div>{{JSRef}}</div>
+
+<p><strong><code>Number.EPSILON</code></strong> 属性表示 1 与{{jsxref("Number")}}可表示的大于 1 的最小的浮点数之间的差值。</p>
+
+<p>你不必创建一个 {{jsxref("Number")}} 对象来访问这个静态属性（直接使用 <code>Number.EPSILON</code>）。</p>
+
+<div>{{js_property_attributes(0, 0, 0)}}</div>
+
+<h2 id="描述">描述</h2>
+
+<p><code>EPSILON</code> 属性的值接近于 <code>2.2204460492503130808472633361816E-16</code>，或者 <code>2<sup>-52。</sup></code></p>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="测试是否相等">测试是否相等</h3>
+
+<pre class="brush: js">x = 0.2;
+y = 0.3;
+z = 0.1;
+equal = (Math.abs(x - y + z) &lt; Number.EPSILON);
+</pre>
+
+<h2 id="Polyfill">Polyfill</h2>
+
+<pre><code>if (Number.EPSILON === undefined) {
+    Number.EPSILON = Math.pow(2, -52);
+}</code></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-number.epsilon', 'Number.EPSILON')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td>最初定义</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-number.epsilon', 'Number.EPSILON')}}</td>
+   <td>{{Spec2('ESDraft')}}</td>
+   <td></td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</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>{{CompatGeckoDesktop("25.0")}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>9</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("25.0")}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>9</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="相关链接">相关链接</h2>
+
+<ul>
+ <li>{{jsxref("Number")}}</li>
+</ul>