files/zh-tw/web/javascript/reference/global_objects/set/delete/index.html


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---
title: Set.prototype.delete()
slug: Web/JavaScript/Reference/Global_Objects/Set/delete
tags:
  - ECMAScript 2015
  - JavaScript
  - 原型
  - 參考
  - 方法
  - 集合
translation_of: Web/JavaScript/Reference/Global_Objects/Set/delete
---
<div>{{JSRef}}</div>

<p><code><strong>delete()</strong></code> 方法會一個 <code>Set</code> 物件中移除指定元素。</p>

<div>{{EmbedInteractiveExample("pages/js/set-prototype-delete.html")}}</div>


<h2 id="語法">語法</h2>

<pre class="syntaxbox"><em>mySet</em>.delete(<em>value</em>);</pre>

<h3 id="參數'">參數'</h3>

<dl>
 <dt><code>value</code></dt>
 <dd>要從 <code>Set</code> 物件中移除的值。</dd>
</dl>

<h3 id="回傳值">回傳值</h3>

<p><code>true</code> 如果成功從 <code>Set</code> 物件中移除；反之 <code>false</code>。</p>

<h2 id="範例">範例</h2>

<h3 id="使用_delete_方法">使用 <code>delete</code> 方法</h3>

<pre class="brush: js">var mySet = new Set();
mySet.add('foo');

mySet.delete('bar'); // Returns false. No "bar" element found to be deleted.
mySet.delete('foo'); // Returns true.  Successfully removed.

mySet.has('foo');    // Returns false. The "foo" element is no longer present.
</pre>

<p>下方展示了如何從一個 Set 中移除物件。</p>

<pre class="brush: js">var setObj = new Set(); // Create a New Set.

setObj.add({x: 10, y: 20}); // Add object in the set.

setObj.add({x: 20, y: 30}); // Add object in the set.

// Delete any point with `x &gt; 10`.
setObj.forEach(function(point){
  if(point.x &gt; 10){
    setObj.delete(point)
  }
})
</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.delete', 'Set.prototype.delete')}}</td>
   <td>{{Spec2('ES2015')}}</td>
   <td>Initial definition.</td>
  </tr>
  <tr>
   <td>{{SpecName('ESDraft', '#sec-set.prototype.delete', 'Set.prototype.delete')}}</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.delete")}}</p>

<h2 id="另見">另見</h2>

<ul>
 <li>{{jsxref("Set")}}</li>
 <li>{{jsxref("Set.prototype.clear()")}}</li>
</ul>