Substack：自动展开「Read more」

// Auto-click "Read more" / "Show more" toggles inside the post body
(function () {
  function expand() {
    document.querySelectorAll('button, a[role="button"]').forEach(function (b) {
      if (b.dataset.jzSubExpanded) { return; }
      var t = (b.textContent || '').trim().toLowerCase();
      if (t === 'read more' || t === 'show more' || t === 'continue reading'
        || t.startsWith('read more') || t.startsWith('show more')) {
        b.dataset.jzSubExpanded = '1';
        try { b.click(); } catch (e) {}
      }
    });
  }
  expand();
  var obs = new MutationObserver(function () {
    clearTimeout(window.__jzSubExpand);
    window.__jzSubExpand = setTimeout(expand, 500);
  });
  obs.observe(document.body, { childList: true, subtree: true });
})();