From 33058f2b292b3a581333bdfb21b8f671898c5060 Mon Sep 17 00:00:00 2001
From: Peter Bengtsson <mail@peterbe.com>
Date: Tue, 8 Dec 2020 14:40:17 -0500
Subject: initial commit

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+---
+title: File.lastModified
+slug: Web/API/File/lastModified
+tags:
+  - API
+  - File API
+  - Files
+translation_of: Web/API/File/lastModified
+---
+<p>{{APIRef("File API")}}</p>
+
+<p>只读属性 <code><strong>File.lastModified</strong></code> 返回所引用文件最后修改日期， 为自 1970年1月1日0:00 以来的毫秒数。没有已知的最后修改时间则会返回当前时间。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="brush:js">var time = <em>instanceOfFile</em>.lastModified;
+</pre>
+
+<h2 id="值">值</h2>
+
+<p>自 1970年1月1日0:00 以来的毫秒数。</p>
+
+<h2 id="实例">实例</h2>
+
+<h3 id="从INPUT标签读取文件">从INPUT标签读取文件</h3>
+
+<pre class="brush: html">&lt;input type="file" multiple id="fileInput"&gt;
+</pre>
+
+<pre class="brush:js">const fileInput = document.getElementById('fileInput');
+fileInput.addEventListener('change', function(event) {
+  // files is a FileList object (simliar to NodeList)
+  const files = event.target.files;
+
+  for (let i = 0; i &lt; files.length; i++) {
+    const date = new Date(files[i].lastModified);
+    alert(files[i].name + ' has a last modified date of ' + date);
+  }
+});
+</pre>
+
+<p>结果：</p>
+
+<p>{{ EmbedLiveSample('Reading_from_file_input', 300, 50) }}</p>
+
+<h3 id="动态创建文件">动态创建文件</h3>
+
+<p>如果文件是动态创建的，可以在构造函数{{domxref("File.File()", "new File()")}} 中提供最后修改时间。如果未提供则会继承文件对象被创建时的{{jsxref("Date.now()")}} 。</p>
+
+<pre class="brush:js">var fileWithDate = new File([], 'file.bin', {
+  lastModified: new Date(2017, 1, 1),
+});
+console.log(fileWithDate.lastModified); //returns 1485903600000
+
+var fileWithoutDate = new File([], 'file.bin');
+console.log(fileWithoutDate.lastModified); //returns current time
+</pre>
+
+<h2 id="规范">规范</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', '#file-attrs', 'lastModified')}}</td>
+   <td>{{Spec2('File API')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<p>{{CompatibilityTable}}</p>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Chrome</th>
+   <th>Edge</th>
+   <th>Firefox (Gecko)</th>
+   <th>Internet Explorer</th>
+   <th>Opera</th>
+   <th>Safari (WebKit)</th>
+  </tr>
+  <tr>
+   <td>File.lastModified</td>
+   <td>13.0</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatGeckoDesktop("15.0")}}</td>
+   <td>10.0</td>
+   <td>16.0</td>
+   <td>{{CompatNo}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Android</th>
+   <th>Edge</th>
+   <th>Firefox Mobile (Gecko)</th>
+   <th>IE Phone</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+  </tr>
+  <tr>
+   <td>File.lastModified</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="参见">参见</h2>
+
+<ul>
+ <li>{{domxref("File")}}</li>
+</ul>
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