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脚注

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注意

脚注是扩展特性，并非所有 Markdown 解析器都支持。

14.1 做为说明/文献​

脚注类似于参考文献或补充说明，统一出现的文档的最后，可在文中任意位置引用。

脚注的定义语法为： [^名称]: 内容注

脚注的引用语法为：[^名称]。比如上面的注就是引用的脚注，点击可以跳转到下面的脚注内容。

14.1.1 行内脚注​

注意

行内脚注是可选功能，并非所有支持脚注的解析器都支持行内脚注。

行内脚注 ^[行内脚注] 不需要显式声明，只要在需要脚注的地方直接使用就可以，解析器会把内容提取出来放到文末。

14.2 做为常量​

脚注还可以做为类似编程中常量的用法。比如下面的 Markdown 代码里面有一张图片，这张图片的地址非常长，如果直接放到代码里面会影响可读性。我们可以把图片地址放到脚注里面，再在需要的地方引用。

![LOGO](data:image/png;base64,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)

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如果我们把图片地址放到脚注里面，代码就会简洁的多。常量脚注的声明方式和引用脚注相似：[名称]: 内容

![LOGO][logo]

[logo]: data:image/png;base64,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

LOGO

去练习

  1. 名称可以是以 ^ 开头的数字或其他文本，内容可以是 Markdown 支持的斜体元素。↩
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https://iamhefang.cn/tutorials/markdown/脚注