$(function () {
  let loadHtmlArr = [
    "cover",
    // "catalog",
    "preface",
    "section_1",
    "section_2",
    "section_3",
    "section_4",
  ];
  $(".pdf_root").html(loadHtmlArr.map(htmlName => {
    return `<div class="${htmlName}_html_root"></div>`;
  }).join(""));
  loadHtmlArr.forEach(htmlName => {
    if (htmlName === "preface") {
      $(`.${htmlName}_html_root`).data("page-params", JSON.stringify({
        htmlName,
        subjectname: "语文",
        num: 12
      }));
    } else if (htmlName === "section_1") {
      $(`.${htmlName}_html_root`).data("page-params", JSON.stringify({
        htmlName,
        subjectname: "数学",
        num: 33
      }));
    }
    $(`.${htmlName}_html_root`).load(`../sections/${htmlName}.html`);
  });
});