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+---
+title: XMLHttpRequest.withCredentials
+slug: Web/API/XMLHttpRequest/withCredentials
+translation_of: Web/API/XMLHttpRequest/withCredentials
+---
+<div>{{APIRef('XMLHttpRequest')}}</div>
+
+<p><code><strong>XMLHttpRequest.withCredentials</strong></code> 屬性是一個 {{jsxref("Boolean")}} 型別,它指出無論是否使用 <code>Access-Control</code> 標頭在跨站的要求上,都應該使用像 Cookies、Authorization 標頭或 TLS 用戶端憑證來進行驗證。在相同來源的要求設定 <code>withCredentials</code> 沒有任何效果。</p>
+
+<p>In addition, this flag is also used to indicate when cookies are to be ignored in the response. The default is <code>false</code>. <code>XMLHttpRequest</code> from a different domain cannot set cookie values for their own domain unless <code>withCredentials</code> is set to <code>true</code> before making the request. The third-party cookies obtained by setting <code>withCredentials</code> to true will still honor same-origin policy and hence can not be accessed by the requesting script through <a href="/en-US/docs/Web/API/Document/cookie">document.cookie</a> or from response headers.</p>
+
+<div class="note">
+<p><strong>Note:</strong> 永遠不會影響到同源請求。</p>
+</div>
+
+<div class="note">
+<p><strong>Note:</strong><strong> </strong><code>XMLHttpRequest</code> responses from a different domain <em>cannot</em> set cookie values for their own domain unless <code>withCredentials</code> is set to <code>true</code> before making the request, regardless of <code>Access-Control-</code> header values. </p>
+</div>
+
+<h2 id="範例">範例</h2>
+
+<pre class="brush: js">var xhr = new XMLHttpRequest();
+xhr.open('GET', 'http://example.com/', true);
+xhr.withCredentials = true;
+xhr.send(null);</pre>
+
+<h2 id="規格">規格</h2>
+
+<table class="standard-table">
+ <tbody>
+ <tr>
+ <th scope="col">規格</th>
+ <th scope="col">狀態</th>
+ <th scope="col">備註</th>
+ </tr>
+ <tr>
+ <td>{{SpecName('XMLHttpRequest', '#the-withcredentials-attribute')}}</td>
+ <td>{{Spec2('XMLHttpRequest')}}</td>
+ <td>WHATWG living standard</td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="瀏覽器相容性">瀏覽器相容性</h2>
+
+
+
+<p>{{Compat("api.XMLHttpRequest.withCredentials")}}</p>