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: FileReader.onload
+slug: Web/API/FileReader/onload
+tags:
+  - 文件
+translation_of: Web/API/FileReader/onload
+---
+<p>{{APIRef}}</p>
+
+<p>当 <strong>FileReader </strong>读取文件的方式为<strong> </strong> <a href="/en-US/docs/Web/API/FileReader/readAsArrayBuffer">readAsArrayBuffer</a>, <a href="/en-US/docs/Web/API/FileReader/readAsBinaryString">readAsBinaryString</a>, <a href="/en-US/docs/Web/API/FileReader/readAsDataURL">readAsDataURL</a> 或者 <a href="/en-US/docs/Web/API/FileReader/readAsText">readAsText</a> 的时候，会触发一个 {{event('load')}} 事件。从而可以使用  <strong><code>FileReader.onload</code></strong> 属性对该事件进行处理。</p>
+
+<h2 id="范例">范例</h2>
+
+<pre class="brush:js; line-numbers  language-js"><code class="language-js">// 一个文件上传的回调 &lt;input type="file" onchange="onChange(event)"&gt;
+function onChange(event) {
+  var file = event.target.files[0];
+  var reader = new FileReader();
+  reader.onload = function(event) {
+    // 文件里的文本会在这里被打印出来
+    console.log(event.target.result)
+  };
+
+  reader.readAsText(file);
+}
+</code></pre>
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