"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
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