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: undefined
+slug: Glossary/undefined
+translation_of: Glossary/undefined
+---
+<p><span class="seoSummary">一个声明未定义的变量的初始值，或没有实际参数的形式参数。</span></p>
+
+<h2 id="例子">例子</h2>
+
+<p> </p>
+
+<pre><code>var x; //创建一个变量，但并没有赋值
+
+console.log("X的值是", x)  //返回X的值是undefined</code></pre>
+
+<p> </p>
+
+<h2 id="更多">更多</h2>
+
+<h3 id="基本知识">基本知识</h3>
+
+<ul>
+ <li>{{Interwiki("wikipedia", "Undefined value")}} on Wikipedia</li>
+</ul>
+
+<h3 id="技术参考">技术参考</h3>
+
+<ul>
+ <li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures">JavaScript data types and data structures</a></li>
+</ul>
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