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+---
+title: WindowBase64
+slug: Web/API/WindowBase64
+translation_of: Web/API/WindowOrWorkerGlobalScope
+translation_of_original: Web/API/WindowBase64
+---
+<p>{{APIRef("HTML DOM")}}</p>
+
+<p>The <code><strong>WindowBase64</strong></code> helper contains utility methods to convert data to and from base64, a binary-to-text encoding scheme. For example it is used in <a href="/en-US/docs/data_URIs">data URIs</a>.</p>
+
+<p>There is no object of this type, though the context object, either the {{domxref("Window")}} for regular browsing scope, or the {{domxref("WorkerGlobalScope")}}  for workers, implements it.</p>
+
+<h2 id="屬性">屬性</h2>
+
+<p><em>This helper neither defines nor inherits any properties.</em></p>
+
+<h2 id="方法">方法</h2>
+
+<p><em>This helper does not inherit any methods.</em></p>
+
+<dl>
+ <dt>{{domxref("WindowBase64.atob()")}}</dt>
+ <dd>Decodes a string of data which has been encoded using base-64 encoding.</dd>
+ <dt>{{domxref("WindowBase64.btoa()")}}</dt>
+ <dd>Creates a base-64 encoded ASCII string from a string of binary data.</dd>
+</dl>
+
+<h2 id="規範">規範</h2>
+
+<table class="standard-table">
+ <thead>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Status</th>
+   <th scope="col">Comment</th>
+  </tr>
+ </thead>
+ <tbody>
+  <tr>
+   <td>{{SpecName('HTML WHATWG', '#windowbase64', 'WindowBase64')}}</td>
+   <td>{{Spec2('HTML WHATWG')}}</td>
+   <td>No change since the latest snapshot, {{SpecName("HTML5.1")}}.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('HTML5.1', '#windowbase64', 'WindowBase64')}}</td>
+   <td>{{Spec2('HTML5.1')}}</td>
+   <td>Snapshot of {{SpecName("HTML WHATWG")}}. No change.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName("HTML5 W3C", "#windowbase64", "WindowBase64")}}</td>
+   <td>{{Spec2('HTML5 W3C')}}</td>
+   <td>Snapshot of {{SpecName("HTML WHATWG")}}. Creation of <code>WindowBase64</code> (properties where on the target before it).</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="瀏覽器相容性">瀏覽器相容性</h2>
+
+<p>{{CompatibilityTable}}</p>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Firefox (Gecko)</th>
+   <th>Chrome</th>
+   <th>Internet Explorer</th>
+   <th>Opera</th>
+   <th>Safari</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatGeckoDesktop(1)}} [1]</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>10.0</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Firefox Mobile (Gecko)</th>
+   <th>Android</th>
+   <th>IE Mobile</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatGeckoMobile(1)}}</td>
+   <td rowspan="1">{{CompatVersionUnknown}}</td>
+   <td rowspan="1">{{CompatVersionUnknown}}</td>
+   <td rowspan="1">{{CompatVersionUnknown}}</td>
+   <td rowspan="1">{{CompatVersionUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<p>[1]  <code>atob()</code> is also available to XPCOM components implemented in JavaScript, even though {{domxref("Window")}} is not the global object in components.</p>
+
+<h2 id="參見">參見</h2>
+
+<ul>
+ <li><a href="/Web/API/WindowBase64/Base64_encoding_and_decoding">Base64 encoding and decoding</a></li>
+ <li>{{domxref("Window")}}, {{domxref("WorkerGlobalScope")}}, {{domxref("DedicatedWorkerGlobalScope")}}, {{domxref("SharedWorkerGlobalScope")}}, and {{domxref("ServiceWorkerGlobalScope")}}</li>
+</ul>