官方用例:/zh-cn/advanced/scroll-behavior.html
import Vue from 'vue'import Router from 'vue-router'import index from '@/components/index.vue'Vue.use(Router)const router = new Router({mode: 'history',//这种方法只能在history模式下使用routes: [{path: '/',name: 'index',component: index}],scrollBehavior (to, from, savedPosition) {if (savedPosition) {return savedPosition //游览器返回记住位置} else {return { x: 0, y: 0 } //滚动到顶}}})export default router