vue-router 中 route data hook 用法

Question

route: {
    data ({ to }) {
      // This is the route data hook. It gets called every time the route
      // changes while this component is active.
      //
      // What we are doing:
      //
      // 1. Get the `to` route using ES2015 argument destructuring;
      // 2. Get the `page` param and cast it to a Number;
      // 3. Fetch the items from the store, which returns a Promise containing
      //    the fetched items;
      // 4. Chain the Promise and return the final data for the component.
      //    Note we are waiting until the items are resolved before resolving
      //    the entire object, because we don't want to update the page before
      //    the items are fetched.
      const page = +to.params.page
      document.title = 'Vue.js HN Clone'
      return store.fetchItemsByPage(page).then(items => ({
        page,
        items
      }))
    }
  },

上面是 vue-hackernews 中的一段代码，文档中没找到这种用法，求大神解读一下。

Answer 1

Vue Router 2版本已移除，详见

https://cn.vuejs.org/v2/guide...