<svg xmlns="http://www.w3.org/2000/svg" style="display: none;"><path stroke-linecap="round" d="M5,0 0,2.5 5,5z" id="raphael-marker-block" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);"/></svg><h2>
时间是个幻觉</h2>
在同步印象笔记的接口中报错，报错的基本信息大致如下：
<mark>golang An invalid XML character (Unicode: 0x8) was found</mark>
原因在于，文本中包含了unicode不可见字符。所以，目标很明确，将不可见字符过滤掉。
我使用了"unicode/utf8"来进行处理，因为我们的数据库默认字符也是utf-8的。看一下这个package的描述：
<blockquote>
Package utf8 implements functions and constants to support text encoded in UTF-8. It includes functions to translate between runes and UTF-8 byte sequences. See https://en.wikipedia.org/wiki/UTF-8
</blockquote>
应该支持的条件是UTF-8的文本，我感觉GBK的应该不支持。刚兴趣的可以留言告诉我。
我们看一下unicode对照表，我看到一篇格式比较端正的CSDN的文章，大家可以去看:ASCII码、Unicode编码对照表 —— ASCII控制字符 Unicode编码 字符编码的前世今生，我截个图吧：
这些都是不可见字符，都需要替换掉。
<pre><code class="lang-go hljs"><span class="token comment">// 我手直接码的，可能有编辑错误，有问题大家自己动手改改</span>
originStr <span class="token operator">:=</span> <span class="token string">"等待处理的字符串"</span>
<span class="token comment">// 将字符串转换为rune数组</span>
srcRunes <span class="token operator">:=</span> <span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token function">rune</span><span class="token punctuation">(</span>originStr<span class="token punctuation">)</span>
<span class="token comment">// 创建一个新的rune数组，用来存放过滤后的数据</span>
dstRunes <span class="token operator">:=</span> <span class="token function">make</span><span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token builtin">rune</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">,</span> <span class="token function">len</span><span class="token punctuation">(</span>srcRunes<span class="token punctuation">)</span><span class="token punctuation">)</span>
<span class="token comment">// 过滤不可见字符，根据上面的表的0-32和127都是不可见的字符</span>
<span class="token keyword">for</span> <span class="token boolean">_</span><span class="token punctuation">,</span> c <span class="token operator">:=</span> <span class="token keyword">range</span> srcRunes <span class="token punctuation">{</span>
<span class="token keyword">if</span> c <span class="token operator">>=</span> <span class="token number">0</span> <span class="token operator">&&</span> c <span class="token operator"><=</span> <span class="token number">31</span> <span class="token punctuation">{</span>
<span class="token keyword">continue</span>
<span class="token punctuation">}</span>
<span class="token keyword">if</span> c <span class="token operator">==</span> <span class="token number">127</span> <span class="token punctuation">{</span>
<span class="token keyword">continue</span>
<span class="token punctuation">}</span>
dstRunes <span class="token operator">=</span> <span class="token function">append</span><span class="token punctuation">(</span>dstRunes<span class="token punctuation">,</span> c<span class="token punctuation">)</span>
<span class="token punctuation">}</span>
result <span class="token operator">:=</span> <span class="token function">string</span><span class="token punctuation">(</span>dstRunes<span class="token punctuation">)</span>
</code></pre>
没有对代码进行压测，也不知道性能怎么样，但感觉来看，应能应该不怎么样吧。
<h2>
