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+---
+title: Object.keys()
+slug: Web/JavaScript/Reference/Global_Objects/Object/keys
+tags:
+  - ECMAScript 5
+  - JavaScript
+translation_of: Web/JavaScript/Reference/Global_Objects/Object/keys
+---
+<div>{{JSRef}}</div>
+
+<p><code><strong>Object.keys()</strong></code> 方法會回傳一個由指定物件所有可列舉之屬性組成的陣列，該陣列中的的排列順序與使用 {{jsxref("Statements/for...in", "for...in")}} 進行迭代的順序相同（兩者的差異在於 <code>for-in</code> 迴圈還會迭代出物件自其原型鏈所繼承來的可列舉屬性）。</p>
+
+<h2 id="語法">語法</h2>
+
+<pre class="syntaxbox"><code>Object.keys(<var>obj</var>)</code></pre>
+
+<h3 id="參數">參數</h3>
+
+<dl>
+ <dt><code>obj</code></dt>
+ <dd>物件，用以回傳其可列舉屬性。</dd>
+</dl>
+
+<h3 id="回傳值">回傳值</h3>
+
+<p>回傳一個包含給定物件內所有可列舉屬性的字串陣列。</p>
+
+<h2 id="描述">描述</h2>
+
+<p><code>Object.keys()</code> 回傳一個陣列，陣列中的各元素為直屬於 <code>obj</code> ，對應可列舉屬性名的字串。回傳結果的排序，與手動對物件屬性作迴圈迭代的結果排序相同。</p>
+
+<h2 id="範例">範例</h2>
+
+<pre class="brush: js">var arr = ['a', 'b', 'c'];
+console.log(Object.keys(arr)); // console: ['0', '1', '2']
+
+// 類似陣列的物件
+var obj = { 0: 'a', 1: 'b', 2: 'c' };
+console.log(Object.keys(obj)); // console: ['0', '1', '2']
+
+// 擁有隨機 key 排序，類似陣列的物件
+var an_obj = { 100: 'a', 2: 'b', 7: 'c' };
+console.log(Object.keys(an_obj)); // console: ['2', '7', '100']
+
+// getFoo 不是可列舉的屬性
+var my_obj = Object.create({}, {
+  getFoo: {
+    value: function() { return this.foo; }
+  }
+});
+my_obj.foo = 1;
+
+console.log(Object.keys(my_obj)); // console: ['foo']
+</pre>
+
+<p>如果想取得物件的所有屬性，包括非可列舉的屬性，請參閱 {{jsxref("Object.getOwnPropertyNames()")}}.</p>
+
+<h2 id="備註">備註</h2>
+
+<p>在 ES5 中，如果這個方法的參數不是一個標準物件(例如原始型別)，將會產生 {{jsxref("TypeError")}}錯誤。而在 ES2015，非物件的參數將會強制轉換成物件。</p>
+
+<pre class="brush: js">Object.keys("foo");
+// TypeError: "foo" is not an object (ES5 code)
+
+Object.keys("foo");
+// ["0", "1", "2"]                   (ES2015 code)
+</pre>
+
+<h2 id="Polyfill">Polyfill</h2>
+
+<p>如需在原生不支援、較舊的環境中增加 <code>Object.keys</code> 的相容性，請複製以下片段：</p>
+
+<pre class="brush: js">// From https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/keys
+if (!Object.keys) {
+  Object.keys = (function() {
+    'use strict';
+    var hasOwnProperty = Object.prototype.hasOwnProperty,
+        hasDontEnumBug = !({ toString: null }).propertyIsEnumerable('toString'),
+        dontEnums = [
+          'toString',
+          'toLocaleString',
+          'valueOf',
+          'hasOwnProperty',
+          'isPrototypeOf',
+          'propertyIsEnumerable',
+          'constructor'
+        ],
+        dontEnumsLength = dontEnums.length;
+
+    return function(obj) {
+      if (typeof obj !== 'object' &amp;&amp; (typeof obj !== 'function' || obj === null)) {
+        throw new TypeError('Object.keys called on non-object');
+      }
+
+      var result = [], prop, i;
+
+      for (prop in obj) {
+        if (hasOwnProperty.call(obj, prop)) {
+          result.push(prop);
+        }
+      }
+
+      if (hasDontEnumBug) {
+        for (i = 0; i &lt; dontEnumsLength; i++) {
+          if (hasOwnProperty.call(obj, dontEnums[i])) {
+            result.push(dontEnums[i]);
+          }
+        }
+      }
+      return result;
+    };
+  }());
+}
+</pre>
+
+<p>請注意以上的代碼片段在 IE7 中( IE8 也有可能 )，從不同的 window 傳入物件將包含非可列舉的 key 。</p>
+
+<p>較精簡的瀏覽器 Polyfill，請參閱 <a href="http://tokenposts.blogspot.com.au/2012/04/javascript-objectkeys-browser.html">Javascript - Object.keys Browser Compatibility</a>.</p>
+
+<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('ES5.1', '#sec-15.2.3.14', 'Object.keys')}}</td>
+   <td>{{Spec2('ES5.1')}}</td>
+   <td>Initial definition. Implemented in JavaScript 1.8.5.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES2015', '#sec-object.keys', 'Object.keys')}}</td>
+   <td>{{Spec2('ES2015')}}</td>
+   <td> </td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-object.keys', 'Object.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>{{CompatibilityTable}}</div>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Chrome</th>
+   <th>Firefox (Gecko)</th>
+   <th>Internet Explorer</th>
+   <th>Opera</th>
+   <th>Safari</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatChrome("5")}}</td>
+   <td>{{CompatGeckoDesktop("2.0")}}</td>
+   <td>{{CompatIE("9")}}</td>
+   <td>{{CompatOpera("12")}}</td>
+   <td>{{CompatSafari("5")}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Android</th>
+   <th>Chrome for Android</th>
+   <th>Firefox Mobile (Gecko)</th>
+   <th>IE Mobile</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="參見">參見</h2>
+
+<ul>
+ <li><a href="/en-US/docs/Enumerability_and_ownership_of_properties">Enumerability and ownership of properties</a></li>
+ <li>{{jsxref("Object.prototype.propertyIsEnumerable()")}}</li>
+ <li>{{jsxref("Object.create()")}}</li>
+ <li>{{jsxref("Object.getOwnPropertyNames()")}}</li>
+ <li>{{jsxref("Object.values()")}} {{experimental_inline}}</li>
+ <li>{{jsxref("Object.entries()")}} {{experimental_inline}}</li>
+</ul>