react如何监听路由url变化

"componentwillreceiveprops"
"shouldcomponentupdate"
"componentwillupdate"
"render"
"componentdidupdate"

使用这些生命周期钩子可以监听到路由相同，参数不同的变化，但是监听不到完全不相同的url的变化。即使路由不同，componentdidmount组件内容所更新的东西变了，但是代码变了，页面没有变，找到了一种方法。withrouter

参考：https://reacttraining.com/react-router/web/api/withrouter

import react from 'react'
import proptypes from 'prop-types'
import { withrouter } from 'react-router'

// a simple component that shows the pathname of the current location
class showthelocation extends react.component {
  static proptypes = {
    match: proptypes.object.isrequired,
    location: proptypes.object.isrequired,
    history: proptypes.object.isrequired
  }

  render() {
    const { match, location, history } = this.props

    return (
      <div>you are now at {location.pathname}</div>
    )
  }
}


export default withrouter(showthelocation) //组件名称，导出该组件，保证在最外边