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<h2>目录</h2>
<ul>
<li><span class="stability_undefined"><a href="#base64_base64">Base64</a></span><ul>
<li><span class="stability_undefined"><a href="#base64">可逆性</a></span></li>
<li><span class="stability_undefined"><a href="#base64_m_encode">[m] encode</a></span><ul>
<li><span class="stability_undefined"><a href="#base64_encode_o_encoding">encode(o, encoding?)</a></span></li>
</ul>
</li>
<li><span class="stability_undefined"><a href="#base64_m_decode">[m] decode</a></span><ul>
<li><span class="stability_undefined"><a href="#base64_decode_o_encoding">decode(o, encoding?)</a></span></li>
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<div id="apicontent">
<h1>Base64<span><a class="mark" href="#base64_base64" id="base64_base64">#</a></span></h1>
<p>Base64 是一种编码方式, 同时可作为一种数据的存储格式, 并非严格意义上的加密与解密.</p>
<p>base64 模块主要用于对数据进行 Base64 编码及解码.</p>
<blockquote>
<p>注: 与 <a href="crypto.html">crypto</a> 模块不同, crypto 模块主要用于信息的加密与解密.</p>
</blockquote>
<blockquote>
<p>参阅:<br><a href="https://en.wikipedia.org/wiki/Base64">Wikipedia (英)</a> / <a href="https://zh.wikipedia.org/wiki/Base64">Wikipedia (中)</a><br><a href="http://www.ruanyifeng.com/blog/2008/06/base64.html">Base64 笔记 (from 阮一峰的网络日志)</a><br><a href="https://juejin.cn/post/6887498543494660109">Base64 是加密算法吗 (from 稀土掘金)</a></p>
</blockquote>
<h2>可逆性<span><a class="mark" href="#base64" id="base64">#</a></span></h2>
<p>Base64 是一种可逆的编码方式:</p>
<pre><code class="lang-js">console.log(base64.decode(base64.encode(&#39;orange&#39;))); // orange
console.log(base64.decode(base64.encode(&#39;简体中文&#39;))); // 简体中文
</code></pre>
<p>但需注意参数的字符编码方式 (默认为 <code>UTF-8</code>), 当存在超出编码表示范围的字符时, 可逆性将遭到破坏:</p>
<pre><code class="lang-js">/* us-ascii 编码无法表示 &quot;&quot;&quot;&quot;. */
console.log(base64.decode(base64.encode(&#39;E2 出口&#39;, &#39;us-ascii&#39;), &#39;us-ascii&#39;)); // E2 ??
</code></pre>
<p>编解码使用了不同的编码方式, 也可能导致可逆性失效:</p>
<pre><code class="lang-js">/* utf-16 与 utf-8 不一致. */
console.log(base64.decode(base64.encode(&#39;简体中文&#39;, &#39;utf-16&#39;), &#39;utf-8&#39;)); // <20><>{<7B>OSN-e<>
</code></pre>
<hr>
<p style="font: bold 2em sans-serif; color: #FF7043">base64</p>
<hr>
<h2>[m] encode<span><a class="mark" href="#base64_m_encode" id="base64_m_encode">#</a></span></h2>
<h3>encode(o, encoding?)<span><a class="mark" href="#base64_encode_o_encoding" id="base64_encode_o_encoding">#</a></span></h3>
<div class="signature"><ul>
<li><strong>o</strong> { <span class="type"><a href="dataTypes.html#datatypes_string">string</a></span> | <span class="type"><a href="dataTypes.html#datatypes_jsbytearray">JsByteArray</a></span> | <span class="type"><a href="dataTypes.html#datatypes_bytearray">ByteArray</a></span> } - 待编码数据</li>
<li><strong>[ encoding = <code>&#39;UTF_8&#39;</code> ]</strong> { <span class="type"><a href="dataTypes.html#datatypes_standardcharset">StandardCharset</a></span> } - 字符编码</li>
<li><ins><strong>returns</strong></ins> { <span class="type"><a href="dataTypes.html#datatypes_string">string</a></span> }</li>
</ul>
</div><p>对数据进行 Base64 编码.</p>
<pre><code class="lang-js">/* 字符串. */
console.log(base64.encode(&#39;hello&#39;, &#39;iso-8859-1&#39;)); // aGVsbG8=
console.log(base64.encode(&#39;hello&#39;, &#39;us-ascii&#39;)); // aGVsbG8=
console.log(base64.encode(&#39;hello&#39;, &#39;utf-8&#39;)); // aGVsbG8=
console.log(base64.encode(&#39;hello&#39;, &#39;utf-16&#39;)); // /v8AaABlAGwAbABv
console.log(base64.encode(&#39;hello&#39;, &#39;utf-16be&#39;)); // AGgAZQBsAGwAbw==
console.log(base64.encode(&#39;hello&#39;, &#39;utf-16le&#39;)); // aABlAGwAbABvAA==
/* JavaScript 字节数组. */
console.log(base64.encode([ 104, 101, 108, 108, 111 ], &#39;utf-8&#39;)); // aGVsbG8=
/* Java 字节数组. */
console.log(base64.encode(new java.lang.String(&#39;hello&#39;).getBytes(), &#39;utf-8&#39;)); // aGVsbG8=
let jsArr = [ 104, 101, 108, 108, 111 ];
let javaArr = util.java.array(&#39;byte&#39;, jsArr.length);
jsArr.forEach((o, i) =&gt; javaArr[i] = o);
console.log(base64.encode(javaArr, &#39;utf-8&#39;)); /* 效果同上. */
</code></pre>
<h2>[m] decode<span><a class="mark" href="#base64_m_decode" id="base64_m_decode">#</a></span></h2>
<h3>decode(o, encoding?)<span><a class="mark" href="#base64_decode_o_encoding" id="base64_decode_o_encoding">#</a></span></h3>
<div class="signature"><ul>
<li><strong>o</strong> { <span class="type"><a href="dataTypes.html#datatypes_string">string</a></span> | <span class="type"><a href="dataTypes.html#datatypes_jsbytearray">JsByteArray</a></span> | <span class="type"><a href="dataTypes.html#datatypes_bytearray">ByteArray</a></span> } - 待解码数据</li>
<li><strong>[ encoding = <code>&#39;UTF_8&#39;</code> ]</strong> { <span class="type"><a href="dataTypes.html#datatypes_standardcharset">StandardCharset</a></span> } - 字符编码</li>
<li><ins><strong>returns</strong></ins> { <span class="type"><a href="dataTypes.html#datatypes_string">string</a></span> }</li>
</ul>
</div><p>对数据进行 Base64 解码.</p>
<pre><code class="lang-js">/* 字符串. */
console.log(base64.decode(&#39;aGVsbG8=&#39;, &#39;iso-8859-1&#39;)); // hello
console.log(base64.decode(&#39;aGVsbG8=&#39;, &#39;us-ascii&#39;)); // hello
console.log(base64.decode(&#39;aGVsbG8=&#39;, &#39;utf-8&#39;)); // hello
console.log(base64.decode(&#39;/v8AaABlAGwAbABv&#39;, &#39;utf-16&#39;)); // hello
console.log(base64.decode(&#39;AGgAZQBsAGwAbw==&#39;, &#39;utf-16be&#39;)); // hello
console.log(base64.decode(&#39;aABlAGwAbABvAA==&#39;, &#39;utf-16le&#39;)); // hello
/* JavaScript 字节数组. */
console.log(base64.decode([ 97, 71, 86, 115, 98, 71, 56, 61 ], &#39;utf-8&#39;)); // hello
/* Java 字节数组. */
console.log(base64.decode(new java.lang.String(&#39;aGVsbG8=&#39;).getBytes(), &#39;utf-8&#39;)); // hello
let jsArr = [ 97, 71, 86, 115, 98, 71, 56, 61 ];
let javaArr = util.java.array(&#39;byte&#39;, jsArr.length);
jsArr.forEach((o, i) =&gt; javaArr[i] = o);
console.log(base64.decode(javaArr, &#39;utf-8&#39;)); /* 效果同上. */
</code></pre>
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