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---
title: FileReader.error
slug: Web/API/FileReader/error
translation_of: Web/API/FileReader/error
---
<div>{{APIRef("File API")}}</div>
<h2 id="總覽">總覽</h2>
<p>回傳讀取檔案時發生的錯誤。</p>
<h2 id="語法">語法</h2>
<pre class="syntaxbox">var <var>error</var> = <em>instanceOfFileReader</em>.error
</pre>
<h2 id="Value">Value</h2>
<p>A {{domxref("DOMError")}}</p>
<h2 id="規格">規格</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("File API", "#FileReader-interface", "FileReader")}}</td>
<td>{{Spec2("File API")}}</td>
<td>Initial definition</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>Edge</th>
<th>Internet Explorer</th>
<th>Opera</th>
<th>Safari</th>
</tr>
<tr>
<td>Basic support</td>
<td>{{CompatGeckoDesktop("1.9.2")}}<sup>[1]</sup></td>
<td>7</td>
<td>{{CompatVersionUnknown}}</td>
<td>10<sup>[2]</sup></td>
<td>12.02<sup>[3]</sup></td>
<td>6.0.2</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>Edge</th>
<th>IE Mobile</th>
<th>Opera Mobile</th>
<th>Safari Mobile</th>
</tr>
<tr>
<td>Basic support</td>
<td>32</td>
<td>3</td>
<td>{{CompatVersionUnknown}}</td>
<td>10</td>
<td>11.5</td>
<td>6.1</td>
</tr>
</tbody>
</table>
</div>
<p>[1] Prior to Gecko 2.0 beta 7 (Firefox 4.0 beta 7), all {{domxref("Blob")}} parameters below were {{domxref("File")}} parameters; this has since been updated to match the specification correctly. Prior to Gecko 13.0 {{geckoRelease("13.0")}} the <code>FileReader.error</code> property returned a {{domxref("FileError")}} object. This interface has been removed and <code>FileReader.error</code> is now returning the {{domxref("DOMError")}} object as defined in the latest FileAPI draft.</p>
<p>[2] IE9 has a <a href="http://html5labs.interoperabilitybridges.com/prototypes/fileapi/fileapi/info">File API Lab</a>.</p>
<p>[3] Opera has <a href="http://www.opera.com/docs/specs/presto28/file/">partial support</a> in 11.1.</p>
<h2 id="閱讀更多">閱讀更多</h2>
<ul>
<li>{{domxref("FileReader")}}</li>
</ul>
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