一句话解释
跳到哪个路由, 加载哪个组件
(增加首屏加载速度)

原来:
import Home from '../pages/Home'
const routes = [
	 {
	 path: '/home',
	 name: 'home',
	 component: Home,
	 }
]

现在:
const routes = [
	 {
	 path: '/home',
	 name: 'home',
	 component: ()=>import('../pages/Home')
	 }
]