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authorPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
committerPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
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+---
+title: FileReader.readAsBinaryString()
+slug: Web/API/FileReader/readAsBinaryString
+translation_of: Web/API/FileReader/readAsBinaryString
+---
+<div>{{APIRef("File API")}} {{non-standard_header}}</div>
+
+<div> </div>
+
+<p><code>readAsBinaryString</code> 方法会读取指定的 {{domxref("Blob")}} 或 {{domxref("File")}} 对象,当读取完成的时候,{{domxref("FileReader.readyState","readyState")}}  会变成<code>DONE</code>(已完成),并触发 {{event("loadend")}} 事件,同时 {{domxref("FileReader.result","result")}} 属性将包含所读取文件原始二进制格式。</p>
+
+<p>注意:从 2012 年 7 月 12 日起,该方法已从 W3C 工作草案废除。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox"><em>instanceOfFileReader</em>.readAsBinaryString(blob);</pre>
+
+<h3 id="参数">参数</h3>
+
+<dl>
+ <dt><code>blob</code></dt>
+ <dd>即将被读取的 {{domxref("Blob")}} 或者 {{domxref("File")}} 对象。</dd>
+</dl>
+
+<h2 id="示例">示例</h2>
+
+<pre class="brush: js">var canvas = document.createElement('canvas');
+var height = 200;
+var width  = 200;
+
+canvas.width  = width;
+canvas.height = height;
+
+var ctx = canvas.getContext('2d');
+
+ctx.strokeStyle = '#090';
+ctx.beginPath();
+ctx.arc(width/2, height/2, width/2 - width/10, 0, Math.PI*2);
+ctx.stroke();
+
+canvas.toBlob(function (blob) {
+ var reader = new FileReader();
+
+ reader.onloadend = function () {
+ console.log(reader.result);
+ }
+
+  reader.readAsBinaryString(blob);
+});</pre>
+
+<h2 id="规范">规范</h2>
+
+<p>该方法已从 FileAPI 标准移除,请使用 {{domxref("FileReader.readAsArrayBuffer()")}} 代替。</p>
+
+<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>Firefox (Gecko)</th>
+ <th>Chrome</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>{{CompatNo}}</td>
+ <td>12.02<sup>[3]</sup></td>
+ <td>6.0</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>IE Mobile</th>
+ <th>Opera Mobile</th>
+ <th>Safari Mobile</th>
+ </tr>
+ <tr>
+ <td>Basic support</td>
+ <td>32</td>
+ <td>3</td>
+ <td>10</td>
+ <td>11.5</td>
+ <td>6.0</td>
+ </tr>
+ </tbody>
+</table>
+</div>
+
+<p>[1] 在Gecko 2.0 beta 7 (Firefox 4.0 beta 7)之前,上述方法中所有的 {{domxref("Blob")}} 参数都只能是一个 {{domxref("File")}} 对象。根据最新的 FileAPI 草案,现在的所有的 {{domxref("Blob")}} 参数既可以是<font face="Consolas, Liberation Mono, Courier, monospace"> </font>{{domxref("Blob")}} 对象也可以是一个<font face="Consolas, Liberation Mono, Courier, monospace"> </font>{{domxref("File")}} 对象。在Gecko 13.0 {{geckoRelease("13.0")}} 之前,FileReader.error 属性会返回一个 <a href="https://developer.mozilla.org/zh-CN/docs/Web/API/FileError">FileError</a> 对象。根据最新的FileAPI草案,现在的  FileReader.error会返回一个 <a href="https://developer.mozilla.org/zh-CN/docs/Web/API/DOMError">DOMError</a> 对象。</p>
+
+<p>[2] IE9有一个 <a href="http://html5labs.interoperabilitybridges.com/prototypes/fileapi/fileapi/info">File API Lab</a>.</p>
+
+<p>[3] Opera从11.10开始 <a href="http://www.opera.com/docs/specs/presto28/file/">部分支持</a> .</p>
+
+<h2 id="相关链接">相关链接</h2>
+
+<ul>
+ <li>{{domxref("FileReader")}}</li>
+</ul>