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+---
+title: Set.prototype.has()
+slug: Web/JavaScript/Reference/Global_Objects/Set/has
+tags:
+  - ECMAScript 2015
+  - JavaScript
+  - 原型
+  - 方法
+  - 集合
+translation_of: Web/JavaScript/Reference/Global_Objects/Set/has
+---
+<div>{{JSRef}}</div>
+
+<p><code><strong>has()</strong></code> 方法對一個指定值元素在 <code>Set</code> 物件中的存在與否回傳一個布林值。</p>
+
+<div>{{EmbedInteractiveExample("pages/js/set-prototype-has.html")}}</div>
+
+
+
+<h2 id="語法">語法</h2>
+
+<pre class="syntaxbox"><em>mySet</em>.has(<em>value</em>);</pre>
+
+<h3 id="參數">參數</h3>
+
+<dl>
+ <dt><code>value</code></dt>
+ <dd>要測試是否存在在 <code>Set</code> 中的值。</dd>
+</dl>
+
+<h3 id="回傳值">回傳值</h3>
+
+<p>回傳 <code>true</code> 如果給定值存在在 <code>Set</code> 物件中；反之回傳 <code>false</code> 。</p>
+
+<div class="blockIndicator note">
+<p><strong>Note:</strong> 技術上來說，<code>has()</code> 使用了 <code><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Equality_comparisons_and_sameness#Same-value-zero_equality">sameValueZero</a></code> 算法來判斷給定元素的存在與否。</p>
+</div>
+
+<h2 id="範例">範例</h2>
+
+<h3 id="使用_has_方法">使用 <code>has</code> 方法</h3>
+
+<pre class="brush: js">var mySet = new Set();
+mySet.add('foo');
+
+mySet.has('foo');  // returns true
+mySet.has('bar');  // returns false
+
+var set1 = new Set();
+var obj1 = {'key1': 1};
+set1.add(obj1);
+
+set1.has(obj1);        // returns true
+set1.has({'key1': 1}); // returns false because they are different object references
+set1.add({'key1': 1}); // now set1 contains 2 entries
+</pre>
+
+<h2 id="規範">規範</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">規範</th>
+   <th scope="col">狀態</th>
+   <th scope="col">註</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES2015', '#sec-set.prototype.has', 'Set.prototype.has')}}</td>
+   <td>{{Spec2('ES2015')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-set.prototype.has', 'Set.prototype.has')}}</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>
+
+
+
+<p>{{Compat("javascript.builtins.Set.has")}}</p>
+
+<h2 id="另見">另見</h2>
+
+<ul>
+ <li>{{jsxref("Set")}}</li>
+ <li>{{jsxref("Set.prototype.add()")}}</li>
+ <li>{{jsxref("Set.prototype.delete()")}}</li>
+</ul>