例子：
https://blog.csdn.net/weixin_39709134/article/details/129020252

锚点超链接：

<a href="#a1">第一章</a><br>
<a href="#a2">第二章</a>
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<p>aaaaaaaaaaaaaaaaaaaaaaaaa</p>
<h1 id='a1'>第一章（锚点名）</h1>
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<h1 id='a2'>第二章（锚点名）</h1>
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