vue-router scrollBehavior无效的问题

Question

复制了官方示例中的scrollBehavior方法

const scrollBehavior = (to, from, savedPosition) => {
  console.log(savedPosition);
  if (savedPosition) {
    // savedPosition is only available for popstate navigations.
    return savedPosition;
  }
  const position = {};
  // new navigation.
  // scroll to anchor by returning the selector
  if (to.hash) {
    position.selector = to.hash;
  }
  // check if any matched route config has meta that requires scrolling to top
  if (to.matched.some(m => m.meta.scrollToTop)) {
    // cords will be used if no selector is provided,
    // or if the selector didn't match any element.
    position.x = 0;
    position.y = 0;
  }
  // if the returned position is falsy or an empty object,
  // will retain current scroll position.
  return position;
};

根据官方文档，后退时应该会获得savedPosition，并自动跳转回之前的位置，我这里console.log(savedPosition)有输出位置，但没有跳转过去

我反复试验，得到的结果是，
在没有加keep-alive的前提下，
打开A页面，向下滚动一定距离，进入B页面，此时若B页面高度较高，超出了浏览器高度，即有滚动条的情况下，后退回A，A是能保持滚动位置的，但若B页面没有滚动条，则后退回A，A也滚回顶部，此时console.log(savedPosition)是有位置的，

但这应该不是正确的实践吧？

Answer 1

找到原因了
https://github.com/vuejs/vue-...

Answer 2

是因为transition的动画问题么？如何处理，只能去掉？

Answer 3

Hooking into transitions involves too many intricacies and depends on custom transition implementations, so vue-router is not going to support that as a built-in. It's possible to implement your own transition component for that purpose though.

vueJs/issues 中作者的意思是vue-router不在支持这个特性了。需要自己在transition组件中去实现

Answer 4

to.hash那里都怎么给值啊