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diff --git a/files/zh-cn/web/javascript/reference/global_objects/math/tan/index.html b/files/zh-cn/web/javascript/reference/global_objects/math/tan/index.html
index 49e0f3c7c2..3ecf39169a 100644
--- a/files/zh-cn/web/javascript/reference/global_objects/math/tan/index.html
+++ b/files/zh-cn/web/javascript/reference/global_objects/math/tan/index.html
@@ -5,22 +5,22 @@ translation_of: Web/JavaScript/Reference/Global_Objects/Math/tan
---
<div>
{{JSRef("Global_Objects", "Math")}}</div>
-<h2 id="Summary" name="Summary">概述</h2>
+<h2 id="Summary">概述</h2>
<p><code><strong>Math.tan()</strong></code> 方法返回一个数值的正切值。</p>
-<h2 id="Syntax" name="Syntax">语法</h2>
+<h2 id="Syntax">语法</h2>
<pre class="syntaxbox">Math.tan(<em>x</em>)</pre>
-<h3 id="Parameters" name="Parameters">参数</h3>
+<h3 id="Parameters">参数</h3>
<dl>
<dt>
<code>x</code></dt>
<dd>
一个数值,表示一个角(单位:弧度)。</dd>
</dl>
-<h2 id="Description" name="Description">描述</h2>
+<h2 id="Description">描述</h2>
<p><code>tan</code> 方法返回一个数值,表示一个角的正切值。</p>
<p>由于 <code>tan</code> 是 <code>Math</code> 的静态方法,所以应该像这样使用 <code>Math.tan()</code>,而不是作为你创建的 <code>Math</code> 实例的方法。</p>
-<h2 id="Examples" name="Examples">示例</h2>
-<h3 id="Example:_Using_Math.tan" name="Example:_Using_Math.tan">例子:使用 <code>Math.tan</code></h3>
+<h2 id="Examples">示例</h2>
+<h3 id="Example:_Using_Math.tan">例子:使用 <code>Math.tan</code></h3>
<p>下面的函数返回变量 <code>x</code> 的正切值:</p>
<pre class="brush:js">function getTan(x) {
return Math.tan(x);