element-ui/examples/pages/template/component.tpl

<style>
  .page-component__scroll {
    height: calc(100% - 80px);
    margin-top: 80px;

    .el-scrollbar__wrap {
      overflow-x: auto;
    }
  }

  .page-component {
    box-sizing: border-box;
    height: 100%;
  
    &.page-container {
      padding: 0;
    }

    .page-component__nav {
      width: 240px;
      position: fixed;
      top: 0;
      bottom: 0;
      margin-top: 80px;
      transition: padding-top .3s;

      .el-scrollbar__wrap {
        height: 100%;
      }

      &.is-extended {
        padding-top: 0;
      }
    }

    .side-nav {
      height: 100%;
      padding-top: 50px;
      padding-bottom: 50px;
      padding-right: 0;

      & > ul {
        padding-bottom: 50px;
      }
    }

    .page-component__content {
      padding-left: 270px;
      padding-bottom: 100px;
      box-sizing: border-box;
    }

    .content {
      padding-top: 50px;

      > {
        h3 {
          margin: 55px 0 20px;
        }

        table {
          border-collapse: collapse;
          width: 100%;
          background-color: #fff;
          font-size: 14px;
          margin-bottom: 45px;
          line-height: 1.5em;

          strong {
            font-weight: normal;
          }

          td, th {
            border-bottom: 1px solid #d8d8d8;
            padding: 15px;
            max-width: 250px;
          }

          th {
            text-align: left;
            white-space: nowrap;
            color: #666;
            font-weight: normal;
          }

          td {
            color: #333;
          }

          th:first-child, td:first-child {
            padding-left: 10px;
          }
        }

        ul:not(.timeline) {
          margin: 10px 0;
          padding: 0 0 0 20px;
          font-size: 14px;
          color: #5e6d82;
          line-height: 2em;
        }
      }
    }

    .page-component-up {
      background-color: #fff;
      position: fixed;
      right: 100px;
      bottom: 150px;
      size: 40px;
      border-radius: 20px;
      cursor: pointer;
      transition: .3s;
      box-shadow: 0 0 6px rgba(0,0,0, .12);

      i {
        color: #409EFF;
        display: block;
        line-height: 40px;
        text-align: center;
        font-size: 12px;
      }

      &.hover {
        opacity: 1;
      }
    }
    .back-top-fade-enter,
    .back-top-fade-leave-active {
      transform: translateY(-30px);
      opacity: 0;
    }
  }
</style>
<template>
  <el-scrollbar class="page-component__scroll" ref="componentScrollBar">
  <div class="page-container page-component">
    <el-scrollbar class="page-component__nav">
      <side-nav :data="navsData[lang]" :base="`/${ lang }/component`"></side-nav>
    </el-scrollbar>
    <div class="page-component__content">
      <router-view class="content"></router-view>
      <footer-nav></footer-nav>
    </div>
    <transition name="back-top-fade">
      <div
        class="page-component-up"
        :class="{ 'hover': hover }"
        v-show="showBackToTop"
        @mouseenter="hover = true"
        @mouseleave="hover = false"
        @click="toTop">
        <i class="el-icon-caret-top"></i>
      </div>
    </transition>
  </div>
  </el-scrollbar>
</template>
<script>
  import bus from '../../bus';
  import navsData from '../../nav.config.json';
  import throttle from 'throttle-debounce/throttle';

  export default {
    data() {
      return {
        lang: this.$route.meta.lang,
        navsData,
        hover: false,
        showBackToTop: false,
        scrollTop: 0,
        showHeader: true,
        componentScrollBar: null,
        componentScrollBoxElement: null
      };
    },
    watch: {
      '$route.path'() {
        // 触发伪滚动条更新
        this.componentScrollBox.scrollTop = 0;
        this.$nextTick(() => {
          this.componentScrollBar.update();
        });
      }
    },
    methods: {
      toTop() {
        this.hover = false;
        this.showBackToTop = false;
        this.componentScrollBox.scrollTop = 0;
      },
      handleScroll() {
        const scrollTop = this.componentScrollBox.scrollTop;
        this.showBackToTop = scrollTop >= 0.5 * document.body.clientHeight;
        if (this.showHeader !== this.scrollTop > scrollTop) {
          this.showHeader = this.scrollTop > scrollTop;
          bus.$emit('toggleHeader', this.showHeader);
        }
        if (scrollTop === 0) {
          this.showHeader = true;
          bus.$emit('toggleHeader', this.showHeader);
        }
        if (!this.navFaded) {
          bus.$emit('fadeNav');
        }
        this.scrollTop = scrollTop;
      }
    },
    created() {
      bus.$on('navFade', val => {
        this.navFaded = val;
      });
    },
    mounted() {
      this.componentScrollBar = this.$refs.componentScrollBar;
      this.componentScrollBox = this.componentScrollBar.$el.querySelector('.el-scrollbar__wrap');
      this.throttledScrollHandler = throttle(300, this.handleScroll);
      this.componentScrollBox.addEventListener('scroll', this.throttledScrollHandler);
    },
    beforeDestroy() {
      this.componentScrollBox.removeEventListener('scroll', this.throttledScrollHandler);
    }
  };
</script>