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authorPeter Bengtsson <mail@peterbe.com>2020-12-08 14:42:52 -0500
committerPeter Bengtsson <mail@peterbe.com>2020-12-08 14:42:52 -0500
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+---
+title: String.length
+slug: Web/JavaScript/Reference/Global_Objects/String/length
+tags:
+ - JavaScript
+ - Property
+ - Prototype
+ - Reference
+ - String
+translation_of: Web/JavaScript/Reference/Global_Objects/String/length
+---
+<div>{{JSRef}}</div>
+
+<p>A propriedade <strong><code>length</code></strong> representa o comprimento de uma string.</p>
+
+<h2 id="Sintaxe">Sintaxe</h2>
+
+<pre class="syntaxbox"><code><var>str</var>.length</code></pre>
+
+<h2 id="Descrição">Descrição</h2>
+
+<p>Esta propriedade retorna o número de code units na string. {{interwiki("wikipedia", "UTF-16")}}, o formato usado pelo JavaScript para a string, usa um single 16-bit code unit para representar os caracteres mais comuns, mas necessita de usar two code units para os caracteres menos comuns, pelo que é possível que o valor retornado por <code>length</code> não seja igual ao número de caracteres numa string.</p>
+
+<p>Para uma string vazia, <code>length</code> is 0.</p>
+
+<p>A propriedade estática (static) <code>String.length</code> retorna o valor 1.</p>
+
+<h2 id="Exemplos">Exemplos</h2>
+
+<h3 id="Uso_simples">Uso simples</h3>
+
+<pre class="brush: js">var x = 'Mozilla';
+var empty = '';
+
+console.log('Mozilla tem de tamanho ' + x.length + ' code units');
+/* "Mozilla tem de tamanho 7 code units" */
+
+console.log('Uma string vazia tem tamanho ' + empty.length);
+/* "Uma string vazia tem tamanho 0" */
+</pre>
+
+<h2 id="Especificações">Especificações</h2>
+
+<table class="standard-table">
+ <tbody>
+ <tr>
+ <th scope="col">Especificação</th>
+ <th scope="col">Estado</th>
+ <th scope="col">Comentário</th>
+ </tr>
+ <tr>
+ <td>{{SpecName('ES1')}}</td>
+ <td>{{Spec2('ES1')}}</td>
+ <td>Definição inicial. Implementado em JavaScript 1.0.</td>
+ </tr>
+ <tr>
+ <td>{{SpecName('ES5.1', '#sec-15.5.5.1', 'String.prototype.length')}}</td>
+ <td>{{Spec2('ES5.1')}}</td>
+ <td> </td>
+ </tr>
+ <tr>
+ <td>{{SpecName('ES6', '#sec-properties-of-string-instances-length', 'String.prototype.length')}}</td>
+ <td>{{Spec2('ES6')}}</td>
+ <td> </td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="Compatibilidade_dos_browsers">Compatibilidade dos browsers</h2>
+
+<div>{{CompatibilityTable}}</div>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+ <tr>
+ <th>Funcionalidade</th>
+ <th>Chrome</th>
+ <th>Firefox (Gecko)</th>
+ <th>Internet Explorer</th>
+ <th>Opera</th>
+ <th>Safari</th>
+ </tr>
+ <tr>
+ <td>Suporte básico</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>Funcionalidade</th>
+ <th>Android</th>
+ <th>Chrome para Android</th>
+ <th>Firefox Mobile (Gecko)</th>
+ <th>IE Mobile</th>
+ <th>Opera Mobile</th>
+ <th>Safari Mobile</th>
+ </tr>
+ <tr>
+ <td>Suporte básico</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="Ver_também">Ver também</h2>
+
+<ul>
+ <li><a href="http://developer.teradata.com/blog/jasonstrimpel/2011/11/javascript-string-length-and-internationalizing-web-applications">JavaScript <code>String.length</code> and Internationalizing Web Applications</a></li>
+</ul>