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+---
+title: Array.prototype.keys()
+slug: Web/JavaScript/Reference/Global_Objects/Array/keys
+tags:
+  - Array
+  - ECMAScript 2015
+  - Iterator
+  - JavaScript
+  - Method
+  - Prototype
+translation_of: Web/JavaScript/Reference/Global_Objects/Array/keys
+---
+<div>{{JSRef}}</div>
+
+<p><code><strong>keys()</strong></code> 方法會回傳一個包含陣列中的每一個索引之鍵（keys）的新 <code><strong>Array Iterator</strong></code> 物件。</p>
+
+<div>{{EmbedInteractiveExample("pages/js/array-keys.html")}}</div>
+
+
+
+<h2 id="語法">語法</h2>
+
+<pre class="syntaxbox"><var>arr</var>.keys()</pre>
+
+<h3 id="回傳值">回傳值</h3>
+
+<p>一個新的 {{jsxref("Array")}} 迭代器（iterator）物件。</p>
+
+<h2 id="範例">範例</h2>
+
+<h3 id="鍵迭代器不會乎略陣列中的空元素">鍵迭代器不會乎略陣列中的空元素</h3>
+
+<pre class="brush: js">var arr = ['a', , 'c'];
+var sparseKeys = Object.keys(arr);
+var denseKeys = [...arr.keys()];
+console.log(sparseKeys); // ['0', '2']
+console.log(denseKeys);  // [0, 1, 2]
+</pre>
+
+<h2 id="規範">規範</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Status</th>
+   <th scope="col">Comment</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES2015', '#sec-array.prototype.keys', 'Array.prototype.keys')}}</td>
+   <td>{{Spec2('ES2015')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-array.prototype.keys', 'Array.prototype.keys')}}</td>
+   <td>{{Spec2('ESDraft')}}</td>
+   <td> </td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="瀏覽器相容性">瀏覽器相容性</h2>
+
+<div>
+
+
+<p>{{Compat("javascript.builtins.Array.keys")}}</p>
+</div>
+
+<h2 id="參見">參見</h2>
+
+<ul>
+ <li>{{jsxref("Array.prototype.values()")}}</li>
+ <li>{{jsxref("Array.prototype.entries()")}}</li>
+ <li><a href="/zh-TW/docs/Web/JavaScript/Reference/Iteration_protocols">迭代協議</a></li>
+</ul>