https://w.atwiki.jp/djmaxinfo/pages/169.html で譜面数を出すjs

count-patterns.js

const classNames = {
  "4b": [
    "table_filter_1_column_12",
    "table_filter_1_column_13",
    "table_filter_1_column_14",
    "table_filter_1_column_15",
  ],
  "5b": [
    "table_filter_1_column_16",
    "table_filter_1_column_17",
    "table_filter_1_column_18",
    "table_filter_1_column_19",
  ],
  "6b": [
    "table_filter_1_column_20",
    "table_filter_1_column_21",
    "table_filter_1_column_22",
    "table_filter_1_column_23",
  ],
  "8b": [
    "table_filter_1_column_24",
    "table_filter_1_column_25",
    "table_filter_1_column_26",
    "table_filter_1_column_27",
  ],
};

const td = [...document.querySelectorAll("#table_sorter_1 tbody td")];

const counts = Object.keys(classNames).reduce((acc, key) => {
  const count = td
    .filter((e) => classNames[key].some((s) => e.className === s))
    .filter((e) => e.innerText !== "-").length;
  acc[key] = count;
  return acc;
}, {});

console.log(counts);