vue2实现tabs侧边导航栏点击内容跳转到对应位置，且内容滚动导航栏切换对应tab

vue2实现tabs侧边导航栏点击内容跳转到对应位置，且内容滚动导航栏切换对应tab

1、tabs使用了 element的插件tabs, 省的自己写滑动动画

2、左侧有用到了 element的插件 NavMenu导航菜单，项目涉及到了切换页面

效果图：

<template>
  <div class="updateDesc_wrapper">
    <div class="updateDesc_con">
      <div class="update_left">
        <div class="update_img">
          <img class="updateImg" src="@/assets/image/update-desc/updateImg.png" />
        </div>
        <div class="update_menu">
          <el-menu default-active="1-1" class="el-menu-vertical-demo updateMenu">
            <el-submenu index="1">
              <template slot="title">
                <span>更新说明</span>
              </template>
              <el-menu-item-group>
                <el-menu-item index="1-1">
                  <img class="img1" src="@/assets/image/update-desc/updateIcon1.png" />
                  <img class="img2" src="@/assets/image/update-desc/updateIcon2.png" />
                  <span>2022-12-30 首页更新说明</span>
                </el-menu-item>
                <!-- <el-menu-item index="1-2">
                  <img class="img1" src="@/assets/image/update-desc/updateIcon1.png" />
                  <img class="img2" src="@/assets/image/update-desc/updateIcon2.png" />
                  <span>2022-12-30 首页更新说明</span>
                </el-menu-item> -->
              </el-menu-item-group>
            </el-submenu>
          </el-menu>
        </div>
      </div>
      <div class="update_right">
        <div class="update_conten" ref="content_wrapper">
          <div class="conten_tit">
            <span class="tit_text">首页更新说明</span>
            <span class="tit_date">发布日期：2022-12-15</span>
          </div>
          <div class="conten_info">
            <div class="content_wrapper">
              <div ref="cont_1" class="roll_box">
                <div class="con_tit">
                  1. 侧边导航优化，全新交互体验
                </div>
                <div class="con_info">
                  <img src="@/assets/image/update-desc/updateSy1.png" />
                </div>
              </div>
              <div ref="cont_2" class="roll_box">
                <div class="con_tit">
                  2. 综合搜索升级：全局统一，轻松查询
                </div>
                <div class="con_info">
                  <p>查企业、查业务、查空壳、查集团 、查政策 、查产业、查研报、查舆情、查融资、查功能</p>
                  <img src="@/assets/image/update-desc/updateSy2.png" />
                  <p><strong>搜索联想功能及搜索结果展示，</strong>同时页面右侧提供历史记录和推荐卡片快捷功能，进一步提升用户体验。</p>
                  <img src="@/assets/image/update-desc/updateSy3.png" />
                </div>
              </div>
              <div ref="cont_3" class="roll_box">
                <div class="con_tit">
                  3. 自定义功能入口
                </div>
                <div class="con_info">
                  <p>根据用户偏好自定义添加快速入口；点击更多可进入“全部功能”页面并支持搜索。</p>
                  <img src="@/assets/image/update-desc/updateSy4.png" />
                </div>
              </div>
              <div ref="cont_4" class="roll_box">
                <div class="con_tit">
                  4. 上线“更新说明”
                </div>
                <div class="con_info">
                  <img src="@/assets/image/update-desc/updateSy5.png" />
                </div>
              </div>
            </div>
          </div>
        </div>
        <div class="update_tab">
          <el-tabs tab-position="right" class="updateTab" @tab-click="scrollTo" :activeName="isScrollNow"
            style="height: fit-content;">
            <el-tab-pane label="1. 侧边导航优化" name="0"></el-tab-pane>
            <el-tab-pane label="2. 综合搜索升级" name="1"></el-tab-pane>
            <el-tab-pane label="3. 自定义功能入口" name="2"></el-tab-pane>
            <el-tab-pane label="4. 上线“更新说明”" name="3"></el-tab-pane>
          </el-tabs>
        </div>
      </div>
    </div>
  </div>
</template>
<script>
export default {
  name: 'update-desc',
  components: {
  },
  data() {
    return {
      isScrollNow: '0'
    }
  },
  mounted() {
    window.addEventListener('scroll', this.onScroll, true)
  },
  created() {
    window.removeEventListener('scroll', this.onScroll, false)
  },
  methods: {
    // 右侧跳转方法
    scrollTo(tab) {
      document.getElementsByClassName('roll_box')[tab.index].scrollIntoView({
        behavior: 'smooth',
        block: 'start',
      })
    },
    // 内容部分滚动方法
    onScroll() {
      const navContents = document.querySelectorAll('.roll_box')
      const offsetTopArr = []
      navContents.forEach((item) => {
        offsetTopArr.push(item.offsetTop)
      })
      const scrollTop = this.$refs.content_wrapper.scrollTop + 240
      let navIndex = 0
      for (let n = 0; n < offsetTopArr.length; n++) {
        if (scrollTop >= offsetTopArr[n]) {
          navIndex = n
          this.isScrollNow = String(navIndex)
          // 滑动底部选中最后一个选项
          if (
            this.$refs.content_wrapper.scrollHeight
            - this.$refs.content_wrapper.scrollTop
            <= this.$refs.content_wrapper.clientHeight + 50
          ) {
            this.isScrollNow = String(offsetTopArr.length - 1)
          }
        }
      }
    },
  },
}
</script>

<style lang="less" scoped>
.updateDesc_wrapper {
  height: 100%;

  .updateDesc_con {
    display: flex;
    justify-content: space-between;
    background: #fff;
    height: 100%;

    .update_left {
      width: 240px;
      border-right: 1px solid rgba(229, 230, 235, 0.7);

      .update_img {
        width: 100%;

        .updateImg {
          width: 100%;
        }
      }

      .update_menu {
        width: 100%;

        /deep/ .updateMenu {
          border-right: none;

          .el-submenu__title {
            padding: 0 !important;
            padding-left: 40px !important;
            text-align: left;
            color: #1D2128;
            height: 40px;
            line-height: 40px;
          }

          .el-menu-item-group__title {
            display: none;
          }

          .el-submenu__icon-arrow {
            color: transparent;
            background: url(../../assets/image/update-desc/updateIcon3.png) no-repeat;
            background-size: contain;
            position: absolute;
            top: 50%;
            right: inherit;
            left: 25px;
            margin-top: -5px;
            font-size: 14px;
            display: block;
            width: 8px;
          }

          .el-submenu.is-opened>.el-submenu__title .el-submenu__icon-arrow {
            transform: rotateZ(90deg);
          }

          .el-submenu .el-menu-item {
            height: 32px;
            line-height: 32px;
            border-left: 2px solid #fff;
            padding: 0 20px 0 40px !important;
            text-align: left;

            img {
              width: 11px;
            }

            .img2 {
              display: none;
            }

            span {
              font-size: 12px;
              color: #1D2128;
              margin-left: 10px;
            }

            &.is-active {
              background: #D1E2FF;
              border-left: 2px solid #2D5CF6;

              .img1 {
                display: none;
              }

              .img2 {
                display: inline;
              }

              span {
                color: #2D5CF6;
              }
            }
          }
        }
      }
    }

    .update_right {
      width: calc(100% - 240px);
      height: 100%;
      display: flex;
      justify-content: space-between;

      .update_conten {
        width: calc(100% - 240px);
        height: 100%;
        overflow-y: auto;
        padding: 24px 60px;
        box-sizing: border-box;

        .conten_tit {
          display: flex;
          justify-content: space-between;
          align-items: center;
          padding-bottom: 16px;
          border-bottom: 1px solid #E5E6EB;

          .tit_text {
            font-weight: 700;
            font-size: 20px;
            line-height: 28px;
            color: #1D2128;
          }

          .tit_date {
            font-size: 14px;
            line-height: 22px;
            color: #86909C;

          }
        }

        .conten_info {
          width: 100%;

          .content_wrapper {
            .roll_box {
              text-align: left;

              .con_tit {
                margin-top: 24px;
                font-weight: 700;
                font-size: 16px;
                line-height: 24px;
                color: #2D5CF6;
                position: relative;

                &::before {
                  content: "";
                  position: absolute;
                  display: block;
                  width: 16px;
                  height: 16px;
                  border-radius: 50%;
                  left: -6px;
                  top: 0px;
                  background: linear-gradient(90deg, rgba(123, 97, 255, 0.3) 0%, rgba(97, 160, 255, 0.3) 107.5%);
                }
              }

              .con_info {
                p {
                  font-size: 14px;
                  line-height: 22px;
                  margin-top: 16px;
                  color: #1D2128;

                }

                img {
                  width: 100%;
                  margin-top: 16px;
                }
              }
            }
          }
        }
      }

      .update_tab {
        width: 240px;
        padding-top: 16px;

        /deep/ .updateTab {
          .el-tabs__header {
            float: left;
            text-align: left;
          }

          .el-tabs__nav {
            float: none !important;
          }

          .el-tabs__item {
            font-size: 14px;
            color: #86909C;
          }

          .el-tabs__item.is-active {
            color: #2D5CF6;
          }

          .el-tabs__active-bar {
            background-color: #2D5CF6;
          }
        }
      }
    }
  }
}
</style>