路由懒加载的目的，避免单页面应用一次性加载时间

import Vue from 'vue';
import Router from 'vue-router';
Vue.use(Router);
// 路由配置
let router = new Router({
  mode: 'history',
  routes: [{
    path: '/',
    // component: login
    component: resolve => require(['@/pages/login'], resolve),
    name: 'Login'
  }]
});

export default router;

偶现 Loading chunk {n} failed 错误，导致页面不能切换

解决方法：  运用vue-router的错误处理函数 onError 捕获错误，代码如下：

router.onError((error) => {
  const pattern = /Loading chunk (\d)+ failed/g;
  const isChunkLoadFailed = error.message.match(pattern);
  const targetPath = router.history.pending.fullPath;
  if (isChunkLoadFailed) {
    router.replace(targetPath);
  }
});