我正在开发一个 React 应用

当通过无限滚动运行此功能时，我会收到错误

Unhandled Rejection (TypeError): can't access property "country", this.props is undefined

async pageUpdater() {
  let url = `https://newsapi.org/v2/top-headlines?country=${this.props.country}&category=${this.props.category}&apiKey=myapi&page=${this.state.page}&pageSize=${this.props.pageSize}`;
  this.setState({ loading: true })
  await fetch(url).then(response => response.json()).then(data => {
    this.setState({ articles: data.articles, totalResults: data.totalResults, loading: false })
  })
}