Vue回到顶部

<template>
  <div id="goTop">
    <div class="goTop" v-show="goTopShow" @click="goTop">
      回到顶部
    </div>
    <div style="height:2000px;"></div>
  </div>
</template>
 <script>
export default {
  name: "goTop",
  data() {
    return {
      scrollTop: "",
      goTopShow: false,
    };
  },
  methods: {
    handleScroll() {
      this.scrollTop = window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop;
      if (this.scrollTop > 200) {
        this.goTopShow = true;
      }
      else{
         this.goTopShow = false; 
      }
    },
    goTop() {
        let timer = setInterval(function () {
        let osTop = document.documentElement.scrollTop || document.body.scrollTop;
        let ispeed = Math.floor(-osTop / 5);
        document.documentElement.scrollTop = document.body.scrollTop = osTop + ispeed;
        this.isTop = true;
        if (osTop === 0) {
          clearInterval(timer);
        }
      }, 30);
    },
  },
  mounted() {
    window.addEventListener("scroll", this.handleScroll);
  },
  destroyed() {
    window.removeEventListener("scroll", this.handleScroll);
  },
};
</script>
  
 <style scoped>
.goTop {
  position: fixed;
  right: 40px;
  bottom: 60px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: #fff;
  padding: 10px;
  cursor: pointer;
  box-shadow: 0 0 6px rgba(0, 0, 0, 0.12);
}
</style>