Vue 组件：一键回顶按钮

backTop.vue

<template>
  <v-fab-transition>
    <v-btn
      v-show="btnFlag"
      color="pink"
      dark
      bottom
      right
      fab
      fixed
      @click="backTop"
    >
      <v-icon>mdi-arrow-up-thick</v-icon>
    </v-btn>
  </v-fab-transition>
</template>

<script>
export default {
  name: 'BackTop',
  data() {
    return {
      btnFlag: false,
    };
  },
  mounted() {
    window.addEventListener('scroll', this.scrollToTop);
  },
  destroyed() {
    window.removeEventListener('scroll', this.scrollToTop);
  },
  methods: {
    backTop() {
      const that = this;
      const timer = setInterval(() => {
        const ispeed = Math.floor(-that.scrollTop / 5);
        document.documentElement.scrollTop = document.body.scrollTop =
          that.scrollTop + ispeed;
        if (that.scrollTop === 0) {
          clearInterval(timer);
        }
      }, 16);
    },
    scrollToTop() {
      const that = this;
      const scrollTop =
        window.pageYOffset ||
        document.documentElement.scrollTop ||
        document.body.scrollTop;
      that.scrollTop = scrollTop;
      if (that.scrollTop > 60) {
        that.btnFlag = true;
      } else {
        that.btnFlag = false;
      }
    },
  },
};
</script>

Template部分使用Vuetify框架。将本组件加载到Vue根组件上即可。