1 const routes = [ { path: '/',
name: 'app',
meta: { title: '页面1' },
component: ()=>import('../a.vue') },
{ path: '/subtable', name: 'app',
meta: { title: '页面2' }, component: （）=>import(../b.vue) } ]
2 vue 打包完的html文件内容如下，部分是prefetch,部分是preload
<link href=/js/chunk-6063dbe9.bce199c3.js rel=prefetch>
<link href=/js/chunk-8e2693ec.7eaa3254.js rel=prefetch>
<link href=/js/chunk-9302b50a.91c77030.js rel=prefetch>
<link href=/js/chunk-cd7b37f0.968f1c77.js rel=prefetch>
<link href=/js/chunk-e0f3ac5e.3d69780b.js rel=prefetch>
<link href=/js/chunk-f1ef4f9e.c12a3d03.js rel=prefetch>
<link href=/css/app.bed9fce3.css rel=preload as=style>
<link href=/css/chunk-vendors.cd6faa65.css rel=preload as=style>
<link href=/js/app.611b3369.js rel=preload as=script>
<link href=/js/chunk-vendors.ef6d0bec.js rel=preload as=script>
3 preload 加载资源一般是**当前页面需要的**，prefetch 一般是**其它页面有可能用到的资源**
