Vue封装回到顶部公共组件(动画过渡)-案例

Posted 2021-09-01 JackieDYH

演示

Top.vue

<template>
  <div class="goTop" v-show="goTopShow" @click="goTop">
    <!-- 我使用的是图，可以使用文字代替，自定义样式 -->
    <img src="./assets/images/btn/top.png" alt="Top">
  </div>
</template>
<script>
export default {
  name: "goTop",
  data() {
    return {
      scrollTop: "",
      goTopShow: false,
    };
  },
  watch: {
    scrollTop(val) {
      if (this.scrollTop > 500) {
        this.goTopShow = true;
      } else {
        this.goTopShow = false;
      }
    },
  },
  methods: {
    handleScroll() {
      this.scrollTop =
        window.pageYOffset ||
        document.documentElement.scrollTop ||
        document.body.scrollTop;
      if (this.scrollTop > 500) {
        this.goTopShow = true;
      }
    },
    goTop() {
      let timer = null,
        _that = this;
      cancelAnimationFrame(timer);
      timer = requestAnimationFrame(function fn() {
        if (_that.scrollTop > 0) {
          _that.scrollTop -= 250;
          document.body.scrollTop = document.documentElement.scrollTop =
            _that.scrollTop;
          timer = requestAnimationFrame(fn);
        } else {
          cancelAnimationFrame(timer);
          _that.goTopShow = false;
        }
      });
    },
  },
  mounted() {
    window.addEventListener("scroll", this.handleScroll);
  },
  destroyed() {
    window.removeEventListener("scroll", this.handleScroll);
  },
};
</script>

<style lang="scss" scoped>
.goTop {
  position: fixed;
  right: 40px;
  bottom: 60px;
  cursor: pointer;
  img{
     width: 60px;
     height: 60px; 
  }
}
</style>

​

使用

//引入组件
import Top from "@/components/common/Top";

//注册组件
export default {
  components: {
    Top,
  },
}

//页面使用组件
<template>
  <div>
    <Top />
  </div>
</template>