vue切换页面(路由)时如何保持滚动条回到顶部

  // 使用 watch 监听$router的变化,
  watch: {
    '$route': function(to, from) {
　    document.body.scrollTop = 0
      document.documentElement.scrollTop = 0
    }
  }

<template>
  <div id="app">
    <router-view />
    <!-- 骨架屏，在菜单组件触发隐藏，目前没想到又好的方式处理 -->
    <common-skeleton v-if="showSkeleton" />
  </div>
</template>

<script>
import CommonSkeleton from './components/Skeleton/common'

export default {
  name: 'App',
  components: {
    CommonSkeleton
  },
  computed: {
    showSkeleton() {
      return this.$store.state.settings.showSkeleton
    }
  },
  watch: {
    '$route'(val) {
      if (!document.getElementsByClassName('app-main') || !document.getElementsByClassName('app-main').length) {
        return
      }
      document.getElementsByClassName('app-main')[0].scrollTop = 0
    }
  }
}
</script>

<style lang="scss" scoped>
@import "~@/styles/mixin.scss";
@import "~@/styles/variables.scss";
#app {
  width: 100%;
  height: 100%;
  @include clearfix;
}
</style>

router.beforeEach((to, from, next) => {
    document.body.scrollTop = 0;
    document.documentElement.scrollTop = 0;
 
    // 兼容IE
    window.scrollTo(0, 0);
    next();
})