JS生成HTML的目录

function getCatalog(className){
    let showDom = document.querySelector("."+className);
    // 获取所有标题元素
    const headings = showDom.querySelectorAll('h1, h2, h3, h4, h5, h6');
    let num = 0;
    let titleArr = Array.from(headings).map(heading=>{
        num+=1;
        let cName = "z_catalog_"+num;
        heading.classList.add(cName);
        const level = parseInt(heading.tagName.charAt(1));
        const title = heading.textContent;
        return {
            level:level,
            title:title,
            className:cName
        }
        });
    return titleArr
}

let catalogArr = getCatalog("v-show-content");
console.info(catalogArr);

function scrollToDiv(className) {
  let mDom = document.querySelector("."+className);
  mDom.scrollIntoView({ behavior: "smooth" });
}

scrollToDiv("z_catalog_5")

<div class="catalog" v-show="showCatalog">
  <div class="catalog_title">
    <div v-show="showCatalog">目录</div>
    <div class="catalog_btn" @click="showCatalog = !showCatalog">
      <Icon type="md-arrow-round-forward" />
    </div>
  </div>
  <div class="catalog_content" v-show="showCatalog">
    <div
      v-for="(catalog, index) in catalogArr"
      :key="index"
      class="catalog_item"
      :style="{ 'margin-left': (catalog.level - 1) * 16 + 'px' }"
      @click="scrollToDiv(catalog.className)"
    >
      {{ catalog.title }}
    </div>
  </div>
</div>

<div class="show_catalog" v-show="!showCatalog" @click="showCatalog = true">
  <Icon type="md-arrow-round-back" />
</div>

{
  data() {
    return {
      showCatalog: true,
      catalogArr: [],
    };
  },
  async mounted() {
    this.init();
  },
  methods: {
    async init() {
      await this.$nextTick();
      this.catalogArr = this.getCatalog("v-show-content");
    },
    getCatalog(className) {
      let showDom = document.querySelector("." + className);
      // 获取所有标题元素
      const headings = showDom.querySelectorAll(
        "h1, h2, h3, h4, h5, h6"
      );
      let num = 0;
      return Array.from(headings).map((heading) => {
        num += 1;
        let cName = "z_catalog_" + num;
        heading.classList.add(cName);
        const level = parseInt(heading.tagName.charAt(1));
        const title = heading.textContent;
        return {
          level: level,
          title: title,
          className: cName,
        };
      });
    },
    scrollToDiv(className) {
      let mDom = document.querySelector("." + className);
      mDom.scrollIntoView({ behavior: "smooth" });
    },
  },
};

.catalog {
  position: absolute;
  width: 200px;
  max-height: 60%;
  box-shadow: 4px 4px 10px 2px #ddd;
  top: 170px;
  right: 20px;
  z-index: 20;
  background: white;
  display: flex;
  flex-direction: column;
  border-radius: 8px;
  overflow: hidden;

  .catalog_title {
    font-weight: bold;
    padding: 6px 10px 6px 14px;
    flex: none;
    display: flex;
    align-items: center;
    justify-content: space-between;

    .catalog_btn {
      font-weight: normal;
      cursor: pointer;
      border-radius: 20px;
      padding-left: 10px;
      font-size: 20px;
    }

    .catalog_btn:hover {
      color: dodgerblue;
    }
  }

  .catalog_content {
    flex: auto;
    overflow-y: auto;
    padding: 20px;
    border-top: 1px solid #ddd;

    .catalog_item {
      cursor: pointer;
      padding-bottom: 6px;
    }

    .catalog_item:hover {
      color: dodgerblue;
    }
  }
}

.show_catalog {
  position: absolute;
  height: 40px;
  width: 40px;
  background: white;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  border-radius: 10px 0 0 10px;
  box-shadow: 4px 4px 10px 2px #ddd;
  font-size: 20px;
}

.show_catalog:hover {
  background: var(--primary);
  color: white;
}