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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 files/zh-cn/web/api/file/getastext/index.html | 45 +++++++++++++++++++++++++++
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 create mode 100644 files/zh-cn/web/api/file/getastext/index.html

(limited to 'files/zh-cn/web/api/file/getastext')

diff --git a/files/zh-cn/web/api/file/getastext/index.html b/files/zh-cn/web/api/file/getastext/index.html
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+---
+title: File.getAsText
+slug: Web/API/File/getAsText
+translation_of: Web/API/File/getAsText
+---
+<p>{{APIRef("File API")}}</p>
+
+<h3 id="概述">概述</h3>
+
+<p>按照指定的编码类型将文件内容解析成字符串并返回.</p>
+
+<h3 id="示例">示例</h3>
+
+<pre class="eval">// fileInput是一个HTMLInputElement元素: &lt;input type="file" id="myfileinput" multiple&gt;
+var fileInput = document.getElementById("myfileinput");
+
+// files是一个FileList对象(类似NodeList)
+var files = fileInput.files;
+
+// 一个对象,包含了允许的MIME类型
+var accept = {
+    binary : ["image/png", "image/jpeg"],
+    text :   ["text/plain", "text/css", "application/xml", "text/html"]
+};
+
+var file;
+
+for (var i = 0; i &lt; files.length; i++) {
+
+    file = files[i];
+
+    // 如果文件的类型能够被检测到
+   if (file !== null) {
+
+        if (accept.text.indexOf(file.mediaType) &gt; -1) {
+
+            // file是个可接受的文本文件,使用utf-8编码读取
+            var data = file.getAsText("utf-8");
+            // 使用字符串方法处理data
+
+        } else if (accept.binary.indexOf(file.mediaType) &gt; -1) {
+            // file是个可接受的二进制文件
+        }
+    }
+}</pre>
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