Element Backtop回到顶部的具体使用

<template>
 Scroll down to see the bottom-right button.
 <el-back target=".page-ponent__scroll .el-scrollbar__wrap"></el-back>
</template>

<template>
 Scroll down to see the bottom-right button.
 <el-back target=".page-ponent__scroll .el-scrollbar__wrap" :bottom="100">
 <div
  style="{
  height: 100%;
  width: 100%;
  background-color: #f2f5f6;
  box-shadow: 0 0 6px rgba(0,0,0, .12);
  text-align: center;
  line-height: 40px;
  color: #1989fa;
  }"
 >
  UP
 </div>
 </el-back>
</template>

<template>
 <div id="app">
  <router-view />
  // 绑定app盒子
  <el-back target="#app" :visibility-height="100"></el-back>
 </div>
</template>

<script>
export default {
 name: "App",
 data() {
  return {};
 },
 methods: {},
 mounted() {}
};
</script>

<style>
#app {
 font-family: "Helvetica Neue", Helvetica, "PingFang SC", "Hiragino Sans GB",
  "Microsoft YaHei", "微软雅黑", Arial, sans-serif;
 -webkit-font-smoothing: antialiased;
 -moz-osx-font-smoothing: grayscale;
 width: 100%;
 height: 100%;
 / 这里给app一个滚动效果 /
 overflow-y: scroll;
}
</style>