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fix
let ancestor = $toclink[activeTocIndex].parentNode;
Uncaught TypeError: Cannot read property 'parentNode' of undefined
errorconst $toclink = $('.toc-link');
only support h1 h2 h3 in markdown syntax, but
const $headerlink = $('.headerlink');
can support h4 h5 ...if .md file contains h4 h5 headers ...
$toclink[activeTocIndex]
activeTocIndex out of range, equals null