1.lazy,Suspense fallback,路由懒加载
//引入Suspense从react中
import React,{Suspense} from 'react'
import Home from './Home'
//懒加载需要写成
const Home = lazy(()=>import('./Home'))
然后用Suspense包裹路由组件
<Suspense fallback={<h1>Loading....</h1>}>
{路由组件}
</Suspense>
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