1 files changed, 7 insertions, 7 deletions
diff --git a/files/zh-cn/web/javascript/reference/global_objects/math/atan/index.html b/files/zh-cn/web/javascript/reference/global_objects/math/atan/index.html
index 460bd0de51..0bdf09d234 100644
--- a/files/zh-cn/web/javascript/reference/global_objects/math/atan/index.html
+++ b/files/zh-cn/web/javascript/reference/global_objects/math/atan/index.html
@@ -5,23 +5,23 @@ translation_of: Web/JavaScript/Reference/Global_Objects/Math/atan
 ---
 <div>
  {{JSRef("Global_Objects", "Math")}}</div>
-<h2 id="Summary" name="Summary">概述</h2>
+<h2 id="Summary">概述</h2>
 <p><code><strong>Math.atan()</strong></code> 函数返回一个数值的反正切（以弧度为单位），即：</p>
 <p><math display="block"><semantics><mrow><mstyle mathvariant="monospace"><mrow><mo lspace="0em" rspace="thinmathspace">Math.atan</mo><mo stretchy="false">(</mo><mi>x</mi><mo stretchy="false">)</mo></mrow></mstyle><mo>=</mo><mo lspace="0em" rspace="0em">arctan</mo><mo stretchy="false">(</mo><mi>x</mi><mo stretchy="false">)</mo><mo>=</mo><mtext> the unique </mtext><mspace width="thickmathspace"></mspace><mi>y</mi><mo>∊</mo><mrow><mo>[</mo><mrow><mo>-</mo><mfrac><mi>π</mi><mn>2</mn></mfrac><mo>;</mo><mfrac><mi>π</mi><mn>2</mn></mfrac></mrow><mo>]</mo></mrow><mspace width="thinmathspace"></mspace><mtext>such that</mtext><mspace width="thickmathspace"></mspace><mo lspace="0em" rspace="0em">tan</mo><mo stretchy="false">(</mo><mi>y</mi><mo stretchy="false">)</mo><mo>=</mo><mi>x</mi></mrow><annotation encoding="TeX">\mathtt{\operatorname{Math.atan}(x)} = \arctan(x) = \text{ the unique } \; y \in \left[-\frac{\pi}{2}; \frac{\pi}{2}\right] \, \text{such that} \; \tan(y) = x</annotation></semantics></math></p>
-<h2 id="Syntax" name="Syntax">语法</h2>
+<h2 id="Syntax">语法</h2>
 <pre class="syntaxbox">Math.atan(<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</dd>
 </dl>
-<h2 id="Description" name="Description">描述</h2>
+<h2 id="Description">描述</h2>
 <p><code>atan</code> 返回一个 <math><semantics><mrow><mo>-</mo><mfrac><mi>π</mi><mn>2</mn></mfrac></mrow><annotation encoding="TeX">-\frac{\pi}{2}</annotation></semantics></math> 到 <math><semantics><mfrac><mi>π</mi><mn>2</mn></mfrac><annotation encoding="TeX">\frac{\pi}{2}</annotation></semantics></math> 弧度之间的数值。</p>
 <p>由于 <code>atan</code> 是 <code>Math</code> 的静态方法，所以应该像这样使用：<code>Math.atan()</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.atan" name="Example:_Using_Math.atan">例子：使用 <code>Math.atan</code></h3>
+<h2 id="Examples">示例</h2>
+<h3 id="Example:_Using_Math.atan">例子：使用 <code>Math.atan</code></h3>
 <pre class="brush:js">Math.atan(1);  // 0.7853981633974483
 Math.atan(0);  // 0
 </pre>
@@ -98,7 +98,7 @@ Math.atan(0);  // 0
   </tbody>
  </table>
 </div>
-<h2 id="See_also" name="See_also">相关链接</h2>
+<h2 id="See_also">相关链接</h2>
 <ul>
  <li>The {{jsxref("Global_Objects/Math", "Math")}} object it belongs to.</li>
  <li>{{jsxref("Math.acos()")}}</li>