只需使用带有插件的文本编辑器。

你的编辑器很可能有一个包/插件来为你处理这个问题。例如，在Emacs中，可以安装markdown-toc TOC生成器。然后在编辑时，只需反复调用M-x markdown-toc-generate-or-refresh-toc。如果你想经常这样做，那就值得一个键绑定。它擅长生成一个简单的TOC，而不会用HTML锚污染您的文档。

其他编辑器也有类似的插件，所以流行的列表是这样的:

器name: markdown-toc Vim: markdown-toc Atom: markdown-toc VSCode: markdown-toc

有一个Ruby脚本叫做mdtoc。rb可以自动生成一个GFM Markdown目录，它与这里发布的其他一些脚本相似，但略有不同。

给定一个输入Markdown文件如下:

# Lorem Ipsum

Lorem ipsum dolor sit amet, mei alienum adipiscing te, has no possit delicata. Te nominavi suavitate sed, quis alia cum no, has an malis dictas explicari. At mel nonumes eloquentiam, eos ea dicat nullam. Sed eirmod gubergren scripserit ne, mei timeam nonumes te. Qui ut tale sonet consul, vix integre oportere an. Duis ullum at ius.

## Et cum

Et cum affert dolorem habemus. Sale malis at mel. Te pri copiosae hendrerit. Cu nec agam iracundia necessitatibus, tibique corpora adipisci qui cu. Et vix causae consetetur deterruisset, ius ea inermis quaerendum.

### His ut

His ut feugait consectetuer, id mollis nominati has, in usu insolens tractatos. Nemore viderer torquatos qui ei, corpora adipiscing ex nec. Debet vivendum ne nec, ipsum zril choro ex sed. Doming probatus euripidis vim cu, habeo apeirian et nec. Ludus pertinacia an pro, in accusam menandri reformidans nam, sed in tantas semper impedit.

### Doctus voluptua

Doctus voluptua his eu, cu ius mazim invidunt incorrupte. Ad maiorum sensibus mea. Eius posse sonet no vim, te paulo postulant salutatus ius, augue persequeris eum cu. Pro omnesque salutandi evertitur ea, an mea fugit gloriatur. Pro ne menandri intellegam, in vis clita recusabo sensibus. Usu atqui scaevola an.

## Id scripta

Id scripta alterum pri, nam audiam labitur reprehendunt at. No alia putent est. Eos diam bonorum oportere ad. Sit ad admodum constituto, vide democritum id eum. Ex singulis laboramus vis, ius no minim libris deleniti, euismod sadipscing vix id.

它生成了这个目录:

$ mdtoc.rb FILE.md 
#### Table of contents

1. [Et cum](#et-cum)
    * [His ut](#his-ut)
    * [Doctus voluptua](#doctus-voluptua)
2. [Id scripta](#id-scripta)

请参阅我关于这个主题的博客文章。

正如在其他回答中提到的，有多种方法可以自动生成目录。大多数都是开源软件，可以根据您的需要进行调整。

然而，我所缺少的是，使用Markdown提供的有限选项，在视觉上吸引人的目录格式。我们得出了以下结论:

Code

## Content

**[1. Markdown](#heading--1)**

  * [1.1. Markdown formatting cheatsheet](#heading--1-1)
  * [1.2. Markdown formatting details](#heading--1-2)

**[2. BBCode formatting](#heading--2)**

  * [2.1. Basic text formatting](#heading--2-1)

      * [2.1.1. Not so basic text formatting](#heading--2-1-1)

  * [2.2. Lists, Images, Code](#heading--2-2)
  * [2.3. Special features](#heading--2-3)

----

在你的文档中，你可以像这样放置目标子部分标记:

<div id="heading--1-1"/>
### 1.1. Markdown formatting cheatsheet

根据你在哪里以及如何使用Markdown，以下也应该工作，并提供了更好看Markdown代码:

### 1.1. Markdown formatting cheatsheet <a name="heading--1-1"/>

例子呈现

内容 1. 减价 1.1. 折算格式备忘单 1.2. 折扣价格式细节 2. BBCode格式化 2.1. 基本文本格式 2.1.1. 不是最基本的文本格式 2.2. 列表，图像，代码 2.3. 特殊功能

优势

You can add as many levels of chapters and sub-chapters as you need. In the Table of Contents, these would appear as nested unordered lists on deeper levels. No use of ordered lists. These would create an indentation, would not link the number, and cannot be used to create decimal classification numbering like "1.1.". No use of lists for the first level. Here, using an unordered list is possible, but not necessary: the indentation and bullet just add visual clutter and no function here, so we don't use a list for the first ToC level at all. Visual emphasis on the first-level sections in the table of content by bold print. Short, meaningful subpart markers that look "beautiful" in the browser's URL bar such as #heading--1-1 rather than markers containing transformed pieces of the actual heading. The code uses H2 headings (## …) for sections, H3 headings (### …) for sub-headings etc.. This makes the source code easier to read because ## … provides a stronger visual clue when scrolling through compared to the case where sections would start with H1 headings (# …). It is still logically consistent as you use the H1 heading for the document title itself. Finally, we add a nice horizontal rule to separate the table of contents from the actual content.

有关这项技术以及我们如何在论坛软件Discourse中使用它的更多信息，请参见这里。

这是一个简短的PHP代码，我用来生成TOC，并丰富任何标题与锚:

$toc = []; //initialize the toc to an empty array
$markdown = "... your mardown content here...";

$markdown = preg_replace_callback("/(#+)\s*([^\n]+)/",function($matches) use (&$toc){
    static $section = [];
    $h = strlen($matches[1]);

    @$section[$h-1]++;
    $i = $h;
    while(isset($section[$i])) unset($section[$i++]);

    $anchor = preg_replace('/\s+/','-', strtolower(trim($matches[2])));

    $toc[] = str_repeat('  ',$h-1)."* [".implode('.',$section).". {$matches[2]}](#$anchor)";
    return str_repeat('#',$h)." <strong>".implode('.',$section).".</strong> ".$matches[2]."\n<a name=\"$anchor\"></a>\n";
}, $markdown);

然后你可以打印经过处理的markdown和toc:

   print(implode("\n",$toc));
   print("\n\n");
   print($markdown);

你可以试一试。

# Table of Contents
1. [Example](#example)
2. [Example2](#example2)
3. [Third Example](#third-example)
4. [Fourth Example](#fourth-examplehttpwwwfourthexamplecom)


## Example
## Example2
## Third Example
## [Fourth Example](http://www.fourthexample.com) 

这是一个小的nodejs脚本，它生成目录，并考虑重复的标题:

const fs = require('fs')
const { mdToPdf } = require('md-to-pdf');

const stringtoreplace = '<toc/>'

const processTitleRepetitions = (contents, titleMap) => {
  for (const content of contents) {
    titleMap[content.link] = typeof titleMap[content.link] === 'undefined'
      ? 0
      : titleMap[content.link] + 1
    if (titleMap[content.link] > 0) {
      content.link = `${content.link}-${titleMap[content.link]}`
    }
  }
}

const convertContentToPdf = async (targetFile) => {
  const pdf = await mdToPdf({path: targetFile}).catch(console.error)
  if(pdf) {
    const pdfFile = `${targetFile.replace(/\.md/, '')}.pdf`
    fs.writeFileSync(pdfFile, pdf.content)
    return pdfFile
  }
  throw new Error("PDF generation failed.")
}

const generateTOC = (file, targetFile) => {
  // Extract headers
  const fileContent = fs.readFileSync(file, 'utf-8')
  const titleLine = /((?<=^)#+)\s(.+)/
  const contents = fileContent.split(/\r?\n/).
    map(line => line.match(titleLine)).
    filter(match => match).
    filter(match => match[1].length > 1).
    map(regExpMatchArray => {
      return {
        level: regExpMatchArray[1].length, text: regExpMatchArray[2],
        link: '#' + regExpMatchArray[2].replace(/(\s+|[.,\/#!$%^&*;:{}=\-_`~()]+)/g, '-').toLowerCase(),
      }
    })
  const titleMap = {}
  processTitleRepetitions(contents, titleMap)
  // Write content
  let toctext = '## Table of Contents\n'
  // Find the toplevel to adjust the level of the table of contents.
  const topLevel = contents.reduce((maxLevel, content) => Math.min(content['level'], maxLevel), 1000)
  levelCounter = {}
  contents.forEach(item => {
    let currentLevel = parseInt(item.level)
    levelCounter[currentLevel] = levelCounter[currentLevel] ? levelCounter[currentLevel] + 1 : 1
    Object.entries(levelCounter).forEach(e => {
      if(currentLevel < parseInt(e[0])) {
        levelCounter[e[0]] = 0
      }
    })
    const level = Array(currentLevel - topLevel).fill('\t').join('')
    const text = `${levelCounter[currentLevel]}. [${item['text']}](${item['link']}) \n`
    toctext += level + text
  })

  const updatedContent = fileContent.toString().replace(stringtoreplace, toctext)
  fs.writeFileSync(targetFile, updatedContent)
  convertContentToPdf(targetFile).then((pdfFile) => {
    console.info(`${pdfFile} has been generated.`)
  })
}

const args = process.argv.slice(2)

if(args.length < 2) {
  console.error("Please provide the name of the markdown file from which the headers should be extracted and the name of the file with the new table of contents")
  console.info("Example: node MD_TOC.js <source_md> <target_md>")
  process.exit(1)
}

const source_md = args[0]
const target_md = args[1]

generateTOC(source_md, target_md)

要使用它，您需要在markdown文件中注入<toc/>。

下面是你如何使用它:

generateTOC('../README.md', '../README_toc.md')

第一个参数是源markdown文件，第二个参数是带有markdown的文件。