react --监听路由变化

// 监听路由变化

// 关键词 this.props.history.listen

this.props.history.listen((route) => {

let routeMap = {

"/index/Header": "2",

"/index/Article": "1",

"/index/Dispatch": "0",

};

this.setState({

menuItem: routeMap[route.pathname]

})

});