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+---
+title: Funcionalidades obsoletas
+slug: Web/JavaScript/Reference/Funcionalidades_obsoletas
+tags:
+  - JavaScript
+  - Obsoleto
+translation_of: Web/JavaScript/Reference/Deprecated_and_obsolete_features
+---
+<div>{{JsSidebar("More")}}</div>
+
+<p>Esta página lista as funcionalidades de JavaScript que estão obsoletas (ou seja, ainda disponíveis, mas planeadas para remoção) e obsoletas (isto é, não são mais utilizáveis).</p>
+
+<h2 id="Funcionalidades_obsoletas">Funcionalidades obsoletas</h2>
+
+<p>Estas funcionalidades obsoletas ainda podem ser utilziadas, mas devem ser utilizadas ​​com cuidado, pois espera-se que estas sejam removidas inteiramente no futuro. Deverá trabalhar para remover a utilização das mesmas do seu código..</p>
+
+<h3 id="Propriedades_de_RegExp">Propriedades de RegExp</h3>
+
+<p>The following properties are deprecated. This does not affect their use in {{jsxref("String.replace", "replacement strings", "", 1)}}:</p>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th>Propriedades</th>
+   <th>Descrição</th>
+  </tr>
+  <tr>
+   <td>{{jsxref("RegExp.n", "$1-$9")}}</td>
+   <td>
+    <p>Parenthesized substring matches, if any.<br>
+     <strong>Warning:</strong> Using these properties can result in problems, since browser extensions can modify them. Avoid them!</p>
+   </td>
+  </tr>
+  <tr>
+   <td>{{jsxref("RegExp.input", "$_")}}</td>
+   <td>See <code>input</code>.</td>
+  </tr>
+  <tr>
+   <td>{{jsxref("RegExp.multiline", "$*")}}</td>
+   <td>See <code>multiline</code>.</td>
+  </tr>
+  <tr>
+   <td>{{jsxref("RegExp.lastMatch", "$&amp;")}}</td>
+   <td>See <code>lastMatch</code>.</td>
+  </tr>
+  <tr>
+   <td>{{jsxref("RegExp.lastParen", "$+")}}</td>
+   <td>See <code>lastParen</code>.</td>
+  </tr>
+  <tr>
+   <td>{{jsxref("RegExp.leftContext", "$`")}}</td>
+   <td>See <code>leftContext</code>.</td>
+  </tr>
+  <tr>
+   <td>{{jsxref("RegExp.rightContext", "$'")}}</td>
+   <td>See <code>rightContext</code>.</td>
+  </tr>
+  <tr>
+   <td>{{jsxref("RegExp.input", "input")}}</td>
+   <td>The string against which a regular expression is matched.</td>
+  </tr>
+  <tr>
+   <td>{{jsxref("RegExp.lastMatch", "lastMatch")}}</td>
+   <td>The last matched characters.</td>
+  </tr>
+  <tr>
+   <td>{{jsxref("RegExp.lastParen", "lastParen")}}</td>
+   <td>The last parenthesized substring match, if any.</td>
+  </tr>
+  <tr>
+   <td>{{jsxref("RegExp.leftContext", "leftContext")}}</td>
+   <td>The substring preceding the most recent match.</td>
+  </tr>
+  <tr>
+   <td>{{jsxref("RegExp.rightContext", "rightContext")}}</td>
+   <td>The substring following the most recent match.</td>
+  </tr>
+ </tbody>
+</table>
+
+<p>The following are now properties of <code>RegExp</code> instances, no longer of the <code>RegExp</code> object:</p>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th>Propriedades</th>
+   <th>Descrição</th>
+  </tr>
+  <tr>
+   <td>{{jsxref("RegExp.global", "global")}}</td>
+   <td>Whether or not to test the regular expression against all possible matches in a string, or only against the first.</td>
+  </tr>
+  <tr>
+   <td>{{jsxref("RegExp.ignoreCase", "ignoreCase")}}</td>
+   <td>Whether or not to ignore case while attempting a match in a string.</td>
+  </tr>
+  <tr>
+   <td>{{jsxref("RegExp.lastIndex", "lastIndex")}}</td>
+   <td>The index at which to start the next match.</td>
+  </tr>
+  <tr>
+   <td>{{jsxref("RegExp.multiline", "multiline")}}</td>
+   <td>Whether or not to search in strings across multiple lines.</td>
+  </tr>
+  <tr>
+   <td>{{jsxref("RegExp.source", "source")}}</td>
+   <td>The text of the pattern.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h3 id="Métodos_de_egExp">Métodos de egExp</h3>
+
+<ul>
+ <li>The {{jsxref("RegExp.compile", "compile()")}} method is deprecated.</li>
+ <li>The <code>valueOf</code> method is no longer specialized for <code>RegExp</code>. Use {{jsxref("Object.valueOf()")}}.</li>
+</ul>
+
+<h3 id="Propriedades_de_Function">Propriedades de <em>Function</em></h3>
+
+<ul>
+ <li>The {{jsxref("Global_Objects/Function/caller", "caller")}} and {{jsxref("Global_Objects/Function/arguments", "arguments")}} properties are deprecated, because they leak the function caller. Instead of the arguments property, you should use the {{jsxref("Functions/arguments", "arguments")}} object inside function closures.</li>
+</ul>
+
+<h3 id="Gerador_de_Legacy">Gerador de <em>Legacy</em></h3>
+
+<ul>
+ <li>{{jsxref("Statements/Legacy_generator_function", "Legacy generator function statement")}} and {{jsxref("Operators/Legacy_generator_function", "Legacy generator function expression")}} are deprecated. Use {{jsxref("Statements/function*", "function* statement")}} and {{jsxref("Operators/function*", "function* expression")}} instead.</li>
+ <li>{{jsxref("Operators/Array_comprehensions", "JS1.7/JS1.8 Array comprehension", "#Differences_to_the_older_JS1.7.2FJS1.8_comprehensions")}} and {{jsxref("Operators/Generator_comprehensions", "JS1.7/JS1.8 Generator comprehension", "#Differences_to_the_older_JS1.7.2FJS1.8_comprehensions")}} are deprecated.</li>
+</ul>
+
+<h3 id="Iterator"><em>Iterator</em></h3>
+
+<ul>
+ <li>{{jsxref("Global_Objects/StopIteration", "StopIteration")}} is deprecated.</li>
+ <li>{{jsxref("Global_Objects/Iterator", "Iterator")}} is deprecated.</li>
+</ul>
+
+<h3 id="Métodos_de_Object">Métodos de <em>Object</em></h3>
+
+<ul>
+ <li>{{jsxref("Object.watch", "watch")}} and {{jsxref("Object.unwatch", "unwatch")}} are deprecated. Use {{jsxref("Proxy")}} instead.</li>
+ <li><code>__iterator__</code> is deprecated.</li>
+ <li>{{jsxref("Object.noSuchMethod", "__noSuchMethod__")}} is deprecated. Use {{jsxref("Proxy")}} instead.</li>
+</ul>
+
+<h3 id="Métodos_de_Date">Métodos de <em>Date</em></h3>
+
+<ul>
+ <li>{{jsxref("Global_Objects/Date/getYear", "getYear")}} and {{jsxref("Global_Objects/Date/setYear", "setYear")}} are affected by the Year-2000-Problem and have been subsumed by {{jsxref("Global_Objects/Date/getFullYear", "getFullYear")}} and {{jsxref("Global_Objects/Date/setFullYear", "setFullYear")}}.</li>
+ <li>You should use {{jsxref("Global_Objects/Date/toISOString", "toISOString")}} instead of the deprecated {{jsxref("Global_Objects/Date/toGMTString", "toGMTString")}} method in new code.</li>
+ <li>{{jsxref("Global_Objects/Date/toLocaleFormat", "toLocaleFormat")}} is deprecated.</li>
+</ul>
+
+<h3 id="Functions"><em>Functions</em></h3>
+
+<ul>
+ <li>{{jsxref("Operators/Expression_closures", "Expression closures", "", 1)}} are deprecated. Use regular {{jsxref("Operators/function", "functions")}} or {{jsxref("Functions/Arrow_functions", "arrow functions", "", 1)}} instead.</li>
+</ul>
+
+<h3 id="Proxy"><em>Proxy</em></h3>
+
+<ul>
+ <li><a href="/en-US/docs/Archive/Web/Old_Proxy_API">Proxy.create</a> and <a href="/en-US/docs/Archive/Web/Old_Proxy_API">Proxy.createFunction</a> are deprecated. Use {{jsxref("Proxy")}} instead.</li>
+ <li>The following traps are obsolete:
+  <ul>
+   <li><code>hasOwn</code> ({{bug(980565)}}, Firefox 33).</li>
+   <li><code>getEnumerablePropertyKeys</code> ({{bug(783829)}}, Firefox 37)</li>
+   <li><code>getOwnPropertyNames</code> ({{bug(1007334)}}, Firefox 33)</li>
+   <li><code>keys</code> ({{bug(1007334)}}, Firefox 33)</li>
+  </ul>
+ </li>
+</ul>
+
+<h3 id="Sequências_de_Escape">Sequências de <em>Escape</em></h3>
+
+<ul>
+ <li>Octal escape sequences (\ followed by one, two, or three octal digits) are deprecated in string and regular expression literals.</li>
+ <li>The {{jsxref("Global_Objects/escape", "escape")}} and {{jsxref("Global_Objects/unescape", "unescape")}} functions are deprecated. Use {{jsxref("Global_Objects/encodeURI", "encodeURI")}}, {{jsxref("Global_Objects/encodeURIComponent", "encodeURIComponent")}}, {{jsxref("Global_Objects/decodeURI", "decodeURI")}} or {{jsxref("Global_Objects/decodeURIComponent", "decodeURIComponent")}} to encode and decode escape sequences for special characters.</li>
+</ul>
+
+<h3 id="Métodos_de_String">Métodos de <em>String</em></h3>
+
+<ul>
+ <li><a href="https://developer.mozilla.org/en-US/docs/tag/HTML%20wrapper%20methods">HTML wrapper methods</a> like {{jsxref("String.prototype.fontsize")}} and {{jsxref("String.prototype.big")}}.</li>
+ <li>{{jsxref("String.prototype.quote")}} is removed from Firefox 37.</li>
+ <li>non standard <code>flags</code> parameter in {{jsxref("String.prototype.search")}}, {{jsxref("String.prototype.match")}}, and {{jsxref("String.prototype.replace")}} are deprecated.</li>
+</ul>
+
+<h2 id="Funcionalidades_removidas">Funcionalidades removidas</h2>
+
+<p>Estas funcionalidades obsoletas foram totalmente removidas do JavaScript e não podem mais ser utilizadas a partir da versão indicada do JavaScript.</p>
+
+<h3 id="Object"><em>Object</em></h3>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th>Property</th>
+   <th>Description</th>
+  </tr>
+  <tr>
+   <td>{{jsxref("Global_Objects/Object/count", "__count__")}}</td>
+   <td>Returns the number of enumerable properties directly on a user-defined object.</td>
+  </tr>
+  <tr>
+   <td>{{jsxref("Global_Objects/Object/Parent", "__parent__")}}</td>
+   <td>Points to an object's context.</td>
+  </tr>
+  <tr>
+   <td>{{jsxref("Global_Objects/Object/eval", "Object.prototype.eval()")}}</td>
+   <td>Evaluates a string of JavaScript code in the context of the specified object.</td>
+  </tr>
+  <tr>
+   <td>{{jsxref("Object.observe()")}}</td>
+   <td>Asynchronously observing the changes to an object.</td>
+  </tr>
+  <tr>
+   <td>{{jsxref("Object.unobserve()")}}</td>
+   <td>Remove observers.</td>
+  </tr>
+  <tr>
+   <td>{{jsxref("Object.getNotifier()")}}</td>
+   <td>Creates an object that allows to synthetically trigger a change.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h3 id="Function"><em>Function</em></h3>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th>Property</th>
+   <th>Description</th>
+  </tr>
+  <tr>
+   <td>{{jsxref("Global_Objects/Function/arity", "arity")}}</td>
+   <td>Number of formal arguments.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h3 id="Array"><em>Array</em></h3>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <td>Property</td>
+   <td>Description</td>
+  </tr>
+  <tr>
+   <td>{{jsxref("Array.observe()")}}</td>
+   <td>Asynchronously observing changes to Arrays.</td>
+  </tr>
+  <tr>
+   <td>{{jsxref("Array.unobserve()")}}</td>
+   <td>Remove observers.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h3 id="Number"><em>Number</em></h3>
+
+<ul>
+ <li>{{jsxref("Number.toInteger()")}}</li>
+</ul>
+
+<h3 id="ParallelArray"><em>ParallelArray</em></h3>
+
+<ul>
+ <li>{{jsxref("ParallelArray")}}</li>
+</ul>
+
+<h3 id="Statements"><em>Statements</em></h3>
+
+<ul>
+ <li>{{jsxref("Statements/for_each...in", "for each...in")}} is deprecated. Use {{jsxref("Statements/for...of", "for...of")}} instead.</li>
+ <li>Destructuring {{jsxref("Statements/for...in", "for...in")}} is deprecated. Use {{jsxref("Statements/for...of", "for...of")}} instead.</li>
+ <li>let blocks and let expressions are obsolete.</li>
+</ul>
+
+<h3 id="E4X">E4X</h3>
+
+<p>See <a href="/en-US/docs/Archive/Web/E4X">E4X</a> for more information.</p>
+
+<h3 id="Variáveis_Sharp">Variáveis <em>Sharp</em></h3>
+
+<p>Consulte <a href="/en-US/docs/Archive/Web/Sharp_variables_in_JavaScript">Sharp variables in JavaScript</a> para mais informação.</p>