我正在尝试实现无限滚动，但遇到了“TypeError：无法读取 null 的属性‘offsetTop’”。我已将我的实现附加在下面。我是 React 的新手，我很乐意听取您的建议，以便更好地实现。

     loadMore = () => {

       this.setState({page: this.state.page + 1})
       this.loadUser();
      };

      handleScroll = () => { 
        var lastLi = document.querySelector("div.container-fluid > div:last-child");
        var lastLiOffset = lastLi.offsetTop + lastLi.clientHeight;
        var pageOffset = window.pageYOffset + window.innerHeight;
      if (pageOffset > lastLiOffset) {
             this.loadMore();
        }
      };

    componentWillMount() {
        this.loadUser();
        this.scrollListener = window.addEventListener("scroll", e => {
            this.handleScroll(e);
          });
     }

    render() {

        if(this.state.dataStatus == false) {
            return (
                <div>
             <Header />   
                <h4>Loading</h4>

            </div>
            );
        } else {
        return(
            <div>
        <Header />   
            <PostContainer posts={this.state.data}/> 

        </div>
        );
        }
    }
}

PostContainer 代码 -> 它遍历数组并调用 Renderpost

class PostContainer extends Component {

constructor(props) {
    super(props);
}

      render() {

           const menu = this.props.posts.map(post => {
            return (

                <RenderPost post={post}/>
            )
            });

          return (
            <div className="container-fluid">
            <div className="row justify-content-center">
               {menu}
            </div>
        </div>
          );
      }

}

RenderPost 代码

 return(

                <div className="post-holder shadow-sm p-3 mb-4 bg-white rounded" key={this.props.post.id}>

            </div>
           );