vscode编辑器markdow文档导出为pdf

1. vscode插件：Markdown Preview Enhanced

2. 在vscode内打开一个markdown文档

3. F1调出命令行，输入：Markdown Preview Enhanced: Extend Parser

4. 弹出的js文件内容替换成下面的代码：

function formatHead(markdown) {
  var seqNo = [];
  var mdArr = markdown.split("\n");
  if (mdArr && mdArr.length > 0) {
      mdArr.forEach((element, i) => {
          var mat = element.match(/^(#+)\s+(\S.*)/);
          if (mat && mat.length > 2) {
              // 找到标题
              var headseq = mat[1].length;
              for (var j = 1; j < headseq; j++) {
                  if (seqNo.length < j) {
                      seqNo.push(1);
                  }
              }
              if (seqNo.length < headseq) {
                  seqNo.push(1);
              } else {
                  seqNo[headseq - 1] = seqNo[headseq - 1] + 1;
                  if (seqNo.length > headseq) {
                      seqNo.splice(headseq, seqNo.length - headseq);
                  }
              }
              mdArr[i] = mat[1] + " " + seqNo.join(".") + "　" + mat[2];
          }
      });
  }
  return mdArr.join("\n");
}

module.exports = {
  onWillParseMarkdown: function(markdown) {
    return new Promise((resolve, reject)=> {
      markdown=formatHead(markdown);
      return resolve(markdown);
    })
  },
  onDidParseMarkdown: function(html) {
    return new Promise((resolve, reject)=> {
      return resolve(html)
    })
  }
}

5. markdown文档头部添加如下代码

---
export_on_save:
    puppeteer: true # export PDF on save
---

 至此，大功告成。书写markdown文档后按保存按钮，会自动在同目录下生成一个同名的pdf文件