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+---
+title: 'TypeError: variable "x" redeclares argument'
+slug: Web/JavaScript/Reference/Errors/Var_hides_argument
+translation_of: Web/JavaScript/Reference/Errors/Var_hides_argument
+---
+<div>{{jsSidebar("Errors")}}</div>
+
+<h2 id="消息">消息</h2>
+
+<pre class="syntaxbox">TypeError: variable "x" redeclares argument (Firefox)
+</pre>
+
+<h2 id="错误类型">错误类型</h2>
+
+<p>{{jsxref("TypeError")}} 警告仅仅在 <a href="/en-US/docs/Web/JavaScript/Reference/Strict_mode">严格模式下</a> 出现。</p>
+
+<h2 id="哪里有问题？">哪里有问题？</h2>
+
+<p>函数参数中出现了名称相同的变量，之后在函数体中使用 <code><a href="/en-US/docs/Web/JavaScript/Reference/Statements/var">var</a></code> 赋值语句重新声明。 这可能是一个命名冲突，所以 JavaScript 警告了它。</p>
+
+<p>这个错误只在 <a href="/en-US/docs/Web/JavaScript/Reference/Strict_mode">严格模式的代码</a> 中作为警告出现。在非严格模式的代码中，重新声明会被忽略。</p>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="无效情况">无效情况</h3>
+
+<p>这个例子中，变量 <code>arg</code> 重新声明了参数。</p>
+
+<pre class="brush: js example-bad">"use strict";
+
+function f(arg) {
+  var arg = "foo";
+}
+</pre>
+
+<h3 id="无效情况_2">无效情况</h3>
+
+<p>为了修复警告，<code><a href="/en-US/docs/Web/JavaScript/Reference/Statements/var">var</a></code> 语句应该被移除，因为变量已经存在。或者，你可以重命名函数参数或者变量名称。</p>
+
+<pre class="brush: js example-good">"use strict";
+
+function f(arg) {
+  arg = "foo";
+}
+</pre>
+
+<h2 id="另见">另见</h2>
+
+<ul>
+ <li><a href="/en-US/docs/Web/JavaScript/Reference/Strict_mode">严格模式</a></li>
+</ul>