src/core/router/index.js

import { supportsPushState } from '../util/env';
import * as dom from '../util/dom';
import { noop } from '../util/core';
import { HashHistory } from './history/hash';
import { HTML5History } from './history/html5';

export function routerMixin(proto) {
  proto.route = {};
}

let lastRoute = {};

function updateRender(vm) {
  vm.router.normalize();
  vm.route = vm.router.parse();
  dom.body.setAttribute('data-page', vm.route.file);
}

export function initRouter(vm) {
  const config = vm.config;
  const mode = config.routerMode || 'hash';
  let router;

  if (mode === 'history' && supportsPushState) {
    router = new HTML5History(config);
  } else {
    router = new HashHistory(config);
  }

  vm.router = router;
  updateRender(vm);
  lastRoute = vm.route;

  // eslint-disable-next-line no-unused-vars
  router.onchange(params => {
    updateRender(vm);
    vm._updateRender();

    if (lastRoute.path === vm.route.path) {
      vm.$resetEvents(params.source);
      return;
    }

    vm.$fetch(noop, vm.$resetEvents.bind(vm, params.source));
    lastRoute = vm.route;
  });
}