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 <transition :name=\"transitionName\">\n    <div v-show=\"visible\" :style=\"customStyle\" class=\"back-to-ceiling\" @click=\"backToTop\">\n      <svg width=\"16\" height=\"16\" viewBox=\"0 0 17 17\" xmlns=\"http://www.w3.org/2000/svg\" class=\"Icon Icon--backToTopArrow\" aria-hidden=\"true\" style=\"height:16px;width:16px\"><path d=\"M12.036 15.59a1 1 0 0 1-.997.995H5.032a.996.996 0 0 1-.997-.996V8.584H1.03c-1.1 0-1.36-.633-.578-1.416L7.33.29a1.003 1.003 0 0 1 1.412 0l6.878 6.88c.782.78.523 1.415-.58 1.415h-3.004v7.004z\" /></svg>\n    </div>\n  </transition>\n</template>\n\n<script>\nexport default {\n  name: 'BackToTop',\n  props: {\n    visibilityHeight: {\n      type: Number,\n      default: 400\n    },\n    backPosition: {\n      type: Number,\n      default: 0\n    },\n    customStyle: {\n      type: Object,\n      default: function() {\n        return {\n          right: '50px',\n          bottom: '50px',\n          width: '40px',\n          height: '40px',\n          'border-radius': '4px',\n          'line-height': '45px',\n          background: '#e7eaf1'\n        }\n      }\n    },\n    transitionName: {\n      type: String,\n      default: 'fade'\n    }\n  },\n  data() {\n    return {\n      visible: false,\n      interval: null,\n      isMoving: false\n    }\n  },\n  mounted() {\n    window.addEventListener('scroll', this.handleScroll)\n  },\n  beforeDestroy() {\n    window.removeEventListener('scroll', this.handleScroll)\n    if (this.interval) {\n      clearInterval(this.interval)\n    }\n  },\n  methods: {\n    handleScroll() {\n      this.visible = window.pageYOffset > this.visibilityHeight\n    },\n    backToTop() {\n      if (this.isMoving) return\n      const start = window.pageYOffset\n      let i = 0\n      this.isMoving = true\n      this.interval = setInterval(() => {\n        const next = Math.floor(this.easeInOutQuad(10 * i, start, -start, 500))\n        if (next <= this.backPosition) {\n          window.scrollTo(0, this.backPosition)\n          clearInterval(this.interval)\n          this.isMoving = false\n        } else {\n          window.scrollTo(0, next)\n        }\n        i++\n      }, 16.7)\n    },\n    easeInOutQuad(t, b, c, d) {\n      if ((t /= d / 2) < 1) return c / 2 * t * t + b\n      return -c / 2 * (--t * (t - 2) - 1) + b\n    }\n  }\n}\n</script>\n\n<style scoped>\n.back-to-ceiling {\n  position: fixed;\n  display: inline-block;\n  text-align: center;\n  cursor: pointer;\n}\n\n.back-to-ceiling:hover {\n  background: #d5dbe7;\n}\n\n.fade-enter-active,\n.fade-leave-active {\n  transition: opacity .5s;\n}\n\n.fade-enter,\n.fade-leave-to {\n  opacity: 0\n}\n\n.back-to-ceiling .Icon {\n  fill: #9aaabf;\n  background: none;\n}\n</style>\n"]}]}