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---
title: 'TypeError: "x" has no properties'
slug: Web/JavaScript/Reference/Errors/No_properties
translation_of: Web/JavaScript/Reference/Errors/No_properties
---
<div>{{jsSidebar("Errors")}}</div>
<h2 id="訊息">訊息</h2>
<pre class="syntaxbox">TypeError: null has no properties
TypeError: undefined has no properties
</pre>
<h2 id="錯誤類型">錯誤類型</h2>
<p>{{jsxref("TypeError")}}.</p>
<h2 id="哪裡錯了？">哪裡錯了？</h2>
<p>{{jsxref("null")}} 與 {{jsxref("undefined")}} 並沒有可訪問的屬性。</p>
<h2 id="示例">示例</h2>
<pre class="brush: js example-bad">null.foo;
// TypeError: null has no properties
undefined.bar;
// TypeError: undefined has no properties
</pre>
<h2 id="參見">參見</h2>
<ul>
<li>{{jsxref("null")}}</li>
<li>{{jsxref("undefined")}}</li>
</ul>
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