解决同一页面因路由参数变化而不能重新渲染页面问题

componentDidMount(){
    this.getedata();
}
componentDidUpdate() {
    this.getedata();
}

解决在componentDidUpdate中不断setstate调用自身的死循环
shouldComponentUpdate(nextProps, nextState) {
    return nextProps.match.params.id != this.props.match.params.id || nextState.newsdetails.news_id != this.state.newsdetails.news_id
}

getedata(){
        post('/news/list',{
            "page":1
        }).then(res => {
            this.setState({
                newslist:res.List
            },()=>{
                console.log("新闻列表",this.state.newslist)
            })
            
        })

        post('/news/details',{
            "news_id":this.props.match.params.id*1
        }).then(res => {
            console.log("新闻详情",res)
            this.setState({
                newsdetails:res
            },()=>{
                console.log("新闻详情",this.state.newsdetails)
            })
            
        })
    }

2. 有参数则传参数，无参数则从url中获取

    updata(id){
        console.log("方法",id)
        this.props.history.push(`/dynamic/news/${id}`)
        this.getedata(id)
    }

    getedata(id) {
        post('/news/list', {
            "page": 1
        }).then(res => {
            this.setState({
                newslist: res.List
            })
        })

        post('/news/details', {
                "news_id": id
        }).then(res => {
            // console.log("新闻详情", res)
            this.setState({
                id: res.news_id,
                newsdetails: res,
                detailstime: res.created_at.split(' ')
            })

        })
    }


    // 请求数据
    componentDidMount() {
        this.getedata(this.props.match.params.id * 1);
    }
    
    
    
    {
        this.state.newslist.length > 0 && this.state.newslist.map((obj, index) => {
            // console.log('11', index)
            return <li key={index} className="main-right-show">
                {/* to={`/dynamic/news/${obj.news_id}`} */}
·····················在这里调用updata方法并传参（当前点击对应页面的id）························
                <div key={index}  onClick={this.updata.bind(this,obj.news_id)}>
                    {/* 展示区内部标题栏 */}
                    <div className="main-right-show-title">
                        <span className="main-right-show-title-time">{obj.created_at}</span>
                        <div className="main-right-show-title-line"></div>
                        <span className="main-right-show-title-word">{obj.tittle}</span>
                    </div>
                    {/* 展示区内部新闻 */}
                    <div className="main-right-show-news" dangerouslySetInnerHTML={{ __html: decodeURI(obj.details).replace(/<[^>]+>/g, "") }}>
                    </div>
                </div>
            </li>
        })
    }