结论：HashRouter不支持location.state

文档：ReactRouter v5

从文档可看到history.push()方法支持2个参数：path, [state]
state即是location.state，常用于隐式地传递状态参数
但文档未提的是，仅适用于BrowserRouter，HashRouter下传入后无效，通过location.state取不到值。

个人场景：微前端适配两种路由模式，这条路走不通！！亲测避坑。

Demo：

import React, { useEffect } from 'react';
import { useHistory, useLocation, BrowserRouter, HashRouter } from 'react-router-dom-v5';

const ComponentA = () => {
	const history = useHistory()
	useEffect(() => {
		history.push('xxx/ComponentB', { from: 'aaa'})
	}, [])
}
const ComponentB = () => {
	const location = useLocation()
	useEffect(() => {
		console.log(location.state)
		// BrowserRouter: { from: 'aaa' }
		// HashRouter: undefined
	}, [location])
}

// 上层Router
<BrowserRouter>
	<Route path="xxx/ComponentA" component={ComponentA} />
	<Route path="xxx/ComponentB" component={ComponentB} />
</BrowserRouter>

<HashRouter>
	<Route path="xxx/ComponentA" component={ComponentA} />
	<Route path="xxx/ComponentB" component={ComponentB} />
</HashRouter>