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---
title: Symbol.prototype.description
slug: Web/JavaScript/Reference/Global_Objects/Symbol/description
tags:
- JavaScript
- Property
- Prototype
- Symbol
translation_of: Web/JavaScript/Reference/Global_Objects/Symbol/description
---
<div>{{JSRef}}</div>
<p><code><strong>description</strong></code> 是一个只读属性，它会返回 {{jsxref("Symbol")}} 对象的可选描述的字符串。</p>
<div>{{EmbedInteractiveExample("pages/js/symbol-prototype-description.html")}}</div>
<h2 id="语法">语法</h2>
<pre class="syntaxbox">Symbol('myDescription').description;
Symbol.iterator.description;
Symbol.for('foo').description;
</pre>
<h2 id="描述">描述</h2>
<p>{{jsxref("Symbol")}} 对象可以通过一个可选的描述创建，可用于调试，但不能用于访问 symbol 本身。<code>Symbol.prototype.description</code> 属性可以用于读取该描述。与 <code>Symbol.prototype.toString()</code> 不同的是它不会包含 "<code>Symbol()</code>" 的字符串。具体请看实例。</p>
<h2 id="实例">实例</h2>
<pre class="brush: js">Symbol('desc').toString(); // "Symbol(desc)"
Symbol('desc').description; // "desc"
Symbol('').description; // ""
Symbol().description; // undefined
// well-known symbols
Symbol.iterator.toString(); // "Symbol(Symbol.iterator)"
Symbol.iterator.description; // "Symbol.iterator"
// global symbols
Symbol.for('foo').toString(); // "Symbol(foo)"
Symbol.for('foo').description; // "foo"
</pre>
<h2 id="规范">规范</h2>
<table class="standard-table">
<tbody>
<tr>
<th scope="col">Specification</th>
<th scope="col">Status</th>
</tr>
<tr>
<td><code><a href="https://tc39.github.io/proposal-Symbol-description/#sec-symbol.prototype.description">get Symbol.prototype.description</a></code> proposal</td>
<td>Stage 3</td>
</tr>
</tbody>
</table>
<h2 id="浏览器兼容">浏览器兼容</h2>
<p>{{Compat("javascript.builtins.Symbol.description")}}</p>
<h2 id="另请参阅">另请参阅</h2>
<ul>
<li>{{jsxref("Symbol.prototype.toString()")}}</li>
<li>Polyfill: <a href="https://npmjs.com/symbol.prototype.description">https://npmjs.com/symbol.prototype.description</a></li>
</ul>
|
