JS实现页面滚动到关闭时的位置与不滚动效果

// router/index.js
{
  path: "/user",
  name: "user",
  component: () => import("../views/user.vue"),
  meta: { scrollTop: 0, keepScroll: true }
},
// ...
router.beforeEach((to, from, next) => {
  // 记录需要缓存页面的滚动条高度
  if (from.meta.keepScroll) {
    const $content = document.querySelector("#app");
    const scrollTop = $content ? $content.scrollTop : 0;
    from.meta.scrollTop = scrollTop;
  }
  next();
});

// utils/index.js
export const getScroll = vm => {
  const scrollTop = vm.$route.meta.scrollTop;
  const $content = document.querySelector('#app');
  if (scrollTop && $content) {
    $content.scrollTop = scrollTop;
  }
};

import * as util from '@/utils/';
//...
activeted() {
  // 保持滚动条
  util.getScroll(this);

}

<template>
  <div id="app">
    <keep-alive >
        <router-view v-if="$route.meta.keepAlive"></router-view>
    </keep-alive>
    <router-view v-if="!$route.meta.keepAlive"></router-view>
  </div>
</template>

{
  path: '/index',
  name: 'index',
  meta: {
    title: ' ',
    keepAlive: true,//此组件需要被缓存
  },
  component: () => import('@/components/index'),
},

beforeRouteLeave (to, from, next) { 
  from.meta.keepAlive = false;
  next();
},

beforeRouteLeave (to, from, next) {
  if (to.path == "/index") {
    to.meta.keepAlive = true;
  } else {
    to.meta.keepAlive = false;
  }
  next();
},

if (history.scrollRestoration) {
    history.scrollRestoration = 'manual';
}