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---
title: FileReader.readyState
slug: Web/API/FileReader/readyState
translation_of: Web/API/FileReader/readyState
---
<div>{{APIRef("File API")}}</div>

<p>提供目前讀取狀態</p>

<h2 id="語法">語法</h2>

<pre class="syntaxbox">var state = <em>instanceOfFileReader</em>.readyState
</pre>

<h2 id="數值">數值</h2>

<p>數字代表 {{domxref("FileReader")}} API 三個可能的狀態:</p>

<p>{{page("/en-US/docs/Web/API/FileReader","State constants")}}</p>

<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">說明</th>
  </tr>
  <tr>
   <td>{{SpecName("File API", "#FileReader-interface", "FileReader")}}</td>
   <td>{{Spec2("File API")}}</td>
   <td>初始化定義</td>
  </tr>
 </tbody>
</table>

<h2 id="瀏覽器相容性">瀏覽器相容性</h2>

{{Compat("api.FileReader.readyState")}}

<h2 id="閱讀更多">閱讀更多</h2>

<ul>
 <li>{{domxref("Blob")}}</li>
</ul>