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authorFlorian Merz <me@fiji-flo.de>2021-02-11 14:45:12 +0100
committerFlorian Merz <me@fiji-flo.de>2021-02-11 14:45:12 +0100
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+---
+title: Math.floor()
+slug: Web/JavaScript/Referencia/Objectes_globals/Math/floor
+translation_of: Web/JavaScript/Reference/Global_Objects/Math/floor
+---
+<div>{{JSRef("Global_Objects", "Math")}}</div>
+
+<h2 id="Summary" name="Summary">Resum</h2>
+
+<p>La funció <strong><code>Math.floor()</code></strong> retorna el nombre més gran dels nombres més petits o iguals a un nombre donat.</p>
+
+<h2 id="Syntax" name="Syntax">Sintaxi</h2>
+
+<pre class="syntaxbox"><code>Math.floor(<var>x</var>)</code></pre>
+
+<h3 id="Parameters" name="Parameters">Paràmetres</h3>
+
+<dl>
+ <dt><code>x</code></dt>
+ <dd>Un nombre.</dd>
+</dl>
+
+<h2 id="Description" name="Description">Descripció</h2>
+
+<p>Degut a que <code>floor()</code> és un mètode estàtic de <code>Math</code>, sempre s'utilitza com a <code>Math.floor()</code>, en comptes de com a mètode d'una instància de <code>Math</code> (<code>Math</code> no és un constructor).</p>
+
+<h2 id="Examples" name="Examples">Exemples</h2>
+
+<h3 id="Example:_Using_Math.floor" name="Example:_Using_Math.floor">Exemple: Utilitzar <code>Math.floor()</code></h3>
+
+<pre class="brush: js">Math.floor( 45.95); // 45
+Math.floor(-45.95); // -46
+</pre>
+
+<h3 id="Example:_Decimal_adjustment" name="Example:_Decimal_adjustment">Exemple: Ajust decimal</h3>
+
+<pre class="brush: js">// Closure
+(function() {
+ /**
+ * Ajust decimal d'un nombre.
+ *
+ * @param {String} type El tipus d'ajust.
+ * @param {Number} value El nombre.
+ * @param {Integer} exp L'exponent (L'algoritme en base 10 de la base d'ajust
+ * @returns {Number} El valor ajustat.
+ */
+ function decimalAdjust(type, value, exp) {
+ // Si exp és undefined o zero...
+ if (typeof exp === 'undefined' || +exp === 0) {
+ return Math[type](value);
+ }
+ value = +value;
+ exp = +exp;
+ // Si value no és un nombre o exp no és un nombre sencer...
+ if (isNaN(value) || !(typeof exp === 'number' &amp;&amp; exp % 1 === 0)) {
+ return NaN;
+ }
+ // Desplaçament
+ value = value.toString().split('e');
+ value = Math[type](+(value[0] + 'e' + (value[1] ? (+value[1] - exp) : -exp)));
+ // Desfer el desplaçament
+ value = value.toString().split('e');
+ return +(value[0] + 'e' + (value[1] ? (+value[1] + exp) : exp));
+ }
+
+ // Arrodoniment decimal
+ if (!Math.round10) {
+ Math.round10 = function(value, exp) {
+ return decimalAdjust('round', value, exp);
+ };
+ }
+ // Arrodoniment decimal a la baixa
+ if (!Math.floor10) {
+ Math.floor10 = function(value, exp) {
+ return decimalAdjust('floor', value, exp);
+ };
+ }
+ // Arrodoniment decimal a l'alça
+ if (!Math.ceil10) {
+ Math.ceil10 = function(value, exp) {
+ return decimalAdjust('ceil', value, exp);
+ };
+ }
+})();
+
+// Arrodoniments
+Math.round10(55.55, -1); // 55.6
+Math.round10(55.549, -1); // 55.5
+Math.round10(55, 1); // 60
+Math.round10(54.9, 1); // 50
+Math.round10(-55.55, -1); // -55.5
+Math.round10(-55.551, -1); // -55.6
+Math.round10(-55, 1); // -50
+Math.round10(-55.1, 1); // -60
+// Arrodoniments a la baixa
+Math.floor10(55.59, -1); // 55.5
+Math.floor10(59, 1); // 50
+Math.floor10(-55.51, -1); // -55.6
+Math.floor10(-51, 1); // -60
+// Arrodoniments a l'alça
+Math.ceil10(55.51, -1); // 55.6
+Math.ceil10(51, 1); // 60
+Math.ceil10(-55.59, -1); // -55.5
+Math.ceil10(-59, 1); // -50
+</pre>
+
+<h2 id="Specifications" name="Specifications">Especificacions</h2>
+
+<table class="standard-table">
+ <tbody>
+ <tr>
+ <th scope="col">Especificació</th>
+ <th scope="col">Estat</th>
+ <th scope="col">Comentaris</th>
+ </tr>
+ <tr>
+ <td>ECMAScript 1a Edició</td>
+ <td>Standard</td>
+ <td>Definició inicial. Implementat a JavaScript 1.0.</td>
+ </tr>
+ <tr>
+ <td>{{SpecName('ES5.1', '#sec-15.8.2.9', 'Math.floor')}}</td>
+ <td>{{Spec2('ES5.1')}}</td>
+ <td> </td>
+ </tr>
+ <tr>
+ <td>{{SpecName('ES6', '#sec-math.floor', 'Math.floor')}}</td>
+ <td>{{Spec2('ES6')}}</td>
+ <td> </td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility" name="Browser_compatibility">Compatibilitat amb navegadors</h2>
+
+<div>{{CompatibilityTable}}</div>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+ <tr>
+ <th>Característica</th>
+ <th>Chrome</th>
+ <th>Firefox (Gecko)</th>
+ <th>Internet Explorer</th>
+ <th>Opera</th>
+ <th>Safari</th>
+ </tr>
+ <tr>
+ <td>Suport bàsic</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>Característica</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>Suport bàsic</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">Vegeu també</h2>
+
+<ul>
+ <li>{{jsxref("Math.abs()")}}</li>
+ <li>{{jsxref("Math.ceil()")}}</li>
+ <li>{{jsxref("Math.round()")}}</li>
+ <li>{{jsxref("Math.sign()")}} {{experimental_inline}}</li>
+ <li>{{jsxref("Math.trunc()")}} {{experimental_inline}}</li>
+</ul>