From 33058f2b292b3a581333bdfb21b8f671898c5060 Mon Sep 17 00:00:00 2001
From: Peter Bengtsson <mail@peterbe.com>
Date: Tue, 8 Dec 2020 14:40:17 -0500
Subject: initial commit

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+---
+title: 'TypeError: property "x" is non-configurable and can''t be deleted'
+slug: Web/JavaScript/Reference/Errors/Cant_delete
+tags:
+  - JavaScript
+  - 严格模式
+  - 类型错误
+  - 错误
+translation_of: Web/JavaScript/Reference/Errors/Cant_delete
+---
+<div>{{jsSidebar("Errors")}}</div>
+
+<h2 id="消息">消息</h2>
+
+<pre class="syntaxbox">TypeError: property "x" is non-configurable and can't be deleted. (Firefox)
+TypeError: Cannot delete property 'x' of #&lt;Object&gt; (Chrome)
+</pre>
+
+<h2 id="错误类型">错误类型</h2>
+
+<p>{{jsxref("TypeError")}} 只出现在严格模式下。</p>
+
+<h2 id="哪里有问题？">哪里有问题？</h2>
+
+<p>尝试删除某个属性，但是这个属性是 <a href="/en-US/docs/Web/JavaScript/Data_structures#Properties">不可配置的</a>。<code>configurable</code>属性控制是否该属性能从对象上删除，以及它的属性（除了<code>writable</code>）能否被修改。</p>
+
+<p>这个错误仅仅在<a href="/en-US/docs/Web/JavaScript/Reference/Strict_mode">严格模式</a>下出现。在非严格模式下，这个操作返回 <code>false</code>。</p>
+
+<h2 id="示例">示例</h2>
+
+<p>不可配置的属性并不特别常见，但是它们可以使用 {{jsxref("Object.defineProperty()")}} 或 {{jsxref("Object.freeze()")}} 创建。</p>
+
+<pre class="brush: js example-bad">'use strict';
+var obj = Object.freeze({name: 'Elsa', score: 157});
+delete obj.score;  // TypeError
+
+'use strict';
+var obj = {};
+Object.defineProperty(obj, 'foo', {value: 2, configurable: false});
+delete obj.foo;  // TypeError
+
+'use strict';
+var frozenArray = Object.freeze([0, 1, 2]);
+frozenArray.pop();  // TypeError
+</pre>
+
+<p>也有一些内建于 JavaScript 的不可配置属性。你可能会尝试删除一个数学常量。</p>
+
+<pre class="brush: js example-bad">'use strict';
+delete Math.PI;  // TypeError</pre>
+
+<h2 id="另见">另见</h2>
+
+<ul>
+ <li><a href="/en-US/docs/Web/JavaScript/Reference/Operators/delete">delete operator</a></li>
+ <li>{{jsxref("Object.defineProperty()")}}</li>
+ <li>{{jsxref("Object.freeze()")}}</li>
+</ul>
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