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+---
+title: Math.E
+slug: Web/JavaScript/Reference/Global_Objects/Math/E
+translation_of: Web/JavaScript/Reference/Global_Objects/Math/E
+---
+<div>{{JSRef}}</div>
+
+<p>La costante <strong><code>Math.E</code></strong> rappresenta la base del logaritmo naturale, e, equivale approssimativamente a 2.718.</p>
+
+<p><math display="block"><semantics><mrow><mstyle mathvariant="monospace"><mi>Math.E</mi></mstyle><mo>=</mo><mi>e</mi><mo>≈</mo><mn>2.718</mn></mrow><annotation encoding="TeX">\mathtt{\mi{Math.E}} = e \approx 2.718</annotation></semantics></math></p>
+
+<div>{{EmbedInteractiveExample("pages/js/math-e.html")}}</div>
+
+
+
+<div>{{js_property_attributes(0, 0, 0)}}</div>
+
+<h2 id="Descrizione">Descrizione</h2>
+
+<p>Poiché <code>E</code> è una proprietà statica di <code>Math</code>, lo si usa sempre come <code>Math.E</code>, piuttosto che come un metodo di un <code>Oggetto Math</code> appositamente creato (<code>Math</code> non ha un costruttore).</p>
+
+<h2 id="Esempi">Esempi</h2>
+
+<h3 id="Uso_di_Math.E"><code><font face="x-locale-heading-primary, zillaslab, Palatino, Palatino Linotype, x-locale-heading-secondary, serif"><span style="background-color: #333333;">Uso di </span></font>Math.E</code></h3>
+
+<p>Il codice seguente restitusice e:</p>
+
+<pre class="brush: js">function getNapier() {
+  return Math.E;
+}
+
+getNapier(); // 2.718281828459045
+</pre>
+
+<h2 id="Specifiche">Specifiche</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 1.0.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES5.1', '#sec-15.8.1.1', 'Math.E')}}</td>
+   <td>{{Spec2('ES5.1')}}</td>
+   <td> </td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES6', '#sec-math.e', 'Math.E')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td> </td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-math.e', 'Math.E')}}</td>
+   <td>{{Spec2('ESDraft')}}</td>
+   <td> </td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Compatibilità_Browser">Compatibilità Browser</h2>
+
+<p class="hidden">The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> and send us a pull request.</p>
+
+<p>{{Compat("javascript.builtins.Math.E")}}</p>
+
+<h2 id="Vedi_anche">Vedi anche</h2>
+
+<ul>
+ <li>{{jsxref("Math.exp()")}}</li>
+ <li>{{jsxref("Math.log()")}}</li>
+ <li>{{jsxref("Math.log1p()")}}</li>
+</ul>