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---
title: File.size
slug: Web/API/File/size
translation_of: Web/API/File/size
---
<p>{{APIRef("File API") }}</p>
<h2 id="概述">概述</h2>
<p><span class="short_text" id="result_box" lang="zh-CN"><span>以字节为单位返回文件的大小。</span></span></p>
<h2 id="语法">语法</h2>
<pre>var size = <em>instanceOfFile</em>.size</pre>
<h2 id="值">值</h2>
<p>一个数</p>
<h2 id="规范"><span class="short_text" id="result_box" lang="zh-CN"><span>规范</span></span></h2>
<p><span class="short_text" id="result_box" lang="zh-CN"><span>不属于任何规范。</span></span></p>
<h2 id="另请参见"><span class="short_text" id="result_box" lang="zh-CN"><span class="alt-edited">另请参见</span></span></h2>
<ul>
<li>{{domxref("Blob.size")}}</li>
</ul>
<p> </p>
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