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fix error about Buffer #29

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fix error about Buffer #29

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5 changes: 3 additions & 2 deletions index.html
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Expand Up @@ -667,16 +667,17 @@ <h4 id="3.2.1">Buffer（数据块）</h4>
<pre><code>var bin = new Buffer([ 0x68, 0x65, 0x6c, 0x6c, 0x6f ]);
var sub = bin.slice(2);

console.log(bin); // =&gt; &lt;Buffer 6c 6c 6f&gt;</code></pre>
sub[0] = 0x65;
console.log(bin); // =&gt; &lt;Buffer 68 65 65 6c 6f&gt;</code></pre>
console.log(bin); // =&gt; &lt;Buffer 65 6c 6f&gt;</code></pre>
<p>也因此，如果想要拷贝一份<code>Buffer</code>，得首先创建一个新的<code>Buffer</code>，并通过<code>.copy</code>方法把原<code>Buffer</code>中的数据复制过去。这个类似于申请一块新的内存，并把已有内存中的数据复制过去。以下是一个例子。</p>
<pre><code>var bin = new Buffer([ 0x68, 0x65, 0x6c, 0x6c, 0x6f ]);
var dup = new Buffer(bin.length);

bin.copy(dup);
dup[0] = 0x48;
console.log(bin); // =&gt; &lt;Buffer 68 65 6c 6c 6f&gt;
console.log(dup); // =&gt; &lt;Buffer 48 65 65 6c 6f&gt;</code></pre>
console.log(dup); // =&gt; &lt;Buffer 48 65 6c 6c 6f&gt;</code></pre>
<p>总之，<code>Buffer</code>将JS的数据处理能力从字符串扩展到了任意二进制数据。</p>
<h4 id="3.2.2">Stream（数据流）</h4>
<blockquote>
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