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authorRyan Johnson <rjohnson@mozilla.com>2021-04-29 16:16:42 -0700
committerGitHub <noreply@github.com>2021-04-29 16:16:42 -0700
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----
-title: Math.floor()
-slug: Web/JavaScript/Reference/Global_Objects/Math/floor
-translation_of: Web/JavaScript/Reference/Global_Objects/Math/floor
----
-<div>{{JSRef}}</div>
-
-<p>La funzione <strong><code>Math.floor()</code></strong> restituisce il numero intero, arrotondato per difetto, del numero passato come parametro.</p>
-
-<h2 id="Sintassi">Sintassi</h2>
-
-<pre class="syntaxbox"><code>Math.floor(<var>x</var>)</code></pre>
-
-<h3 id="Parametri">Parametri</h3>
-
-<dl>
- <dt><code>x</code></dt>
- <dd>Un numero.</dd>
-</dl>
-
-<h3 id="Valore_di_ritorno">Valore di ritorno</h3>
-
-<p>Un numero intero rappresentante l'arrotondamento per difetto del numero passato come parametro.</p>
-
-<h2 id="Descrizione">Descrizione</h2>
-
-<p>Siccome <code>floor()</code> è un metodo statico di <code>Math</code>, viene sempre usato come <code>Math.floor()</code> piuttosto che come metodo di un oggetto <code>Math</code> creato in precedenza (<code>Math</code> non è un costruttore).</p>
-
-<h2 id="Esempi">Esempi</h2>
-
-<h3 id="Math.floor()"><code>Math.floor()</code></h3>
-
-<pre class="brush: js">Math.floor( 45.95); // 45
-Math.floor( 45.05); // 45
-Math.floor( 4 ); // 4
-Math.floor(-45.05); // -46
-Math.floor(-45.95); // -46
-</pre>
-
-<h3 id="Arrotondamento_decimale">Arrotondamento decimale</h3>
-
-<pre class="brush: js">// Closure
-(function() {
- /**
- * Decimal adjustment of a number.
- *
- * @param {String} type The type of adjustment.
- * @param {Number} value The number.
- * @param {Integer} exp The exponent (the 10 logarithm of the adjustment base).
- * @returns {Number} The adjusted value.
- */
- function decimalAdjust(type, value, exp) {
- // If the exp is undefined or zero...
- if (typeof exp === 'undefined' || +exp === 0) {
- return Math[type](value);
- }
- value = +value;
- exp = +exp;
- // If the value is not a number or the exp is not an integer...
- if (isNaN(value) || !(typeof exp === 'number' &amp;&amp; exp % 1 === 0)) {
- return NaN;
- }
- // Shift
- value = value.toString().split('e');
- value = Math[type](+(value[0] + 'e' + (value[1] ? (+value[1] - exp) : -exp)));
- // Shift back
- value = value.toString().split('e');
- return +(value[0] + 'e' + (value[1] ? (+value[1] + exp) : exp));
- }
-
- // Decimal round
- if (!Math.round10) {
- Math.round10 = function(value, exp) {
- return decimalAdjust('round', value, exp);
- };
- }
- // Decimal floor
- if (!Math.floor10) {
- Math.floor10 = function(value, exp) {
- return decimalAdjust('floor', value, exp);
- };
- }
- // Decimal ceil
- if (!Math.ceil10) {
- Math.ceil10 = function(value, exp) {
- return decimalAdjust('ceil', value, exp);
- };
- }
-})();
-
-// Round
-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
-// Floor
-Math.floor10(55.59, -1); // 55.5
-Math.floor10(59, 1); // 50
-Math.floor10(-55.51, -1); // -55.6
-Math.floor10(-51, 1); // -60
-// Ceil
-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="Specifiche">Specifiche</h2>
-
-<table class="standard-table">
- <tbody>
- <tr>
- <th scope="col">Specifica</th>
- <th scope="col">Stato</th>
- <th scope="col">Commento</th>
- </tr>
- <tr>
- <td>{{SpecName('ES1')}}</td>
- <td>{{Spec2('ES1')}}</td>
- <td>Definizione iniziale. Implementata in 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>
- <tr>
- <td>{{SpecName('ESDraft', '#sec-math.floor', 'Math.floor')}}</td>
- <td>{{Spec2('ESDraft')}}</td>
- <td> </td>
- </tr>
- </tbody>
-</table>
-
-<h2 id="Compatibilità_dei_Browser">Compatibilità dei 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.floor")}}</p>
-
-<h2 id="Vedi_anche">Vedi anche</h2>
-
-<ul>
- <li>{{jsxref("Math.abs()")}}</li>
- <li>{{jsxref("Math.ceil()")}}</li>
- <li>{{jsxref("Math.round()")}}</li>
- <li>{{jsxref("Math.sign()")}}</li>
- <li>{{jsxref("Math.trunc()")}}</li>
-</ul>