https://github.com/ReactTrain...

直接使用history的方法history.listen()在切換路由的時(shí)候就會(huì)自動(dòng)觸發(fā)

import createHistory from "history/createBrowserHistory"

const history = createHistory()

// Get the current location.
const location = history.location

// Listen for changes to the current location.
const unlisten = history.listen((location, action) => {
  // location is an object like window.location
  console.log(action, location.pathname, location.state)
})

// Use push, replace, and go to navigate around.
history.push("/home", { some: "state" })

// To stop listening, call the function returned from listen().
unlisten()

我們一般都會(huì)使用一個(gè)state管理器，比如react-redux，其中store中有個(gè)subscriptions就可以監(jiān)聽(tīng)路由的變化。
建議你使用封裝過(guò)的react-redux之dvajs

沒(méi)必要啊，直接用 componentDidUpdate 就可以吧。