const out = {};
// 找所有含「导入前」的容器，取最大的那个的 innerText
let big = '';
for (const el of document.querySelectorAll('div')) {
  const x = el.innerText || '';
  if (/导入前/.test(x) && x.length > big.length && x.length < 60000) big = x;
}
out.len = big.length;
out.lines = big.split('\n').map(s=>s.replace(/\t/g,' | ')).filter(s=>s.trim()).slice(0, 150);
// 行数统计
const rows = [...document.querySelectorAll('tr')].filter(r => r.offsetParent !== null);
out.nRows = rows.length;
out.rowTexts = rows.slice(0, 60).map(r => (r.innerText||'').replace(/\n/g,' | ').trim());
return out;