Javascript Can'；t访问Facebook Graph Api response-reactJs的数据

我花了一整天的时间试图找到一个如何访问Facebook的解决方案。 我将FB.api与一个嵌套请求一起使用，得到了响应，一切正常

下面是我从Facebook Graph Api获得的响应示例

{
  "insights": {
    "data": [
      {
        "name": "page_fan_adds_unique",
        "period": "month",
        "values": [
          {
            "value": 272,
            "end_time": "2019-10-08T07:00:00+0000"
          },
          {
            "value": 270,
            "end_time": "2019-10-09T07:00:00+0000"
          }
        ],
        "title": null,
        "description": "The number of new people who have liked your Page.",
        "id": "1021596371302281/insights/page_fan_adds_unique/month"
      },
      {
        "name": "page_fan_removes_unique",
        "period": "month",
        "values": [
          {
            "value": 450,
            "end_time": "2019-10-08T07:00:00+0000"
          },
          {
            "value": 453,
            "end_time": "2019-10-09T07:00:00+0000"
          }
        ],
        "title": null,
        "description": "Unlikes of your Page.",
        "id": "1021596371302281/insights/page_fan_removes_unique/month"
      },
      {
        "name": "page_views_total",
        "period": "month",
        "values": [
          {
            "value": 6430,
            "end_time": "2019-10-08T07:00:00+0000"
          },
          {
            "value": 6339,
            "end_time": "2019-10-09T07:00:00+0000"
          }
        ],
        "title": null,
        "description": "The number of times a Page's profile has been viewed by logged in and logged out people.",
        "id": "1021596371302281/insights/page_views_total/month"
      }
    ],

我在用react。我在父组件中进行了APi调用，如下所示：

async componentDidMount() {
    const resI = await axios.get(
      'https://graph.facebook.com/MyID/',
      {
        params: {
          access_token: process.env.REACT_APP_FACEBOOK_ACCESS_TOKEN,
          fields:
            'insights.metric(page_fans, post_engaged_users, post_impressions_unique, page_fan_adds_unique, page_fan_removes_unique, page_views_total, page_fans_gender_age, page_fans_country, page_fans_city, page_fans_locale).period(month)'
        }
      }
    );
    this.setState({insights: resI.data});
    console.log(this.state.insights.insights.data[0].values[1].value); //I Get 270. It working in the parent component
  }

我将从API获得的数据作为道具传递给其他组件

....
<div>
   <GlobalPerf insights={this.state.insights} />
</div>
......

class GlobalPerf extends Component {
  render() {
    const ins = this.props.insights; // I can't go deeper than that.

    console.log(ins.insights);

我无法访问对象中的值。我不能再深入了。道具 当我尝试这个.props.insights.data时，它不起作用。有人能帮我弄清楚吗？Thx

this.setState({insights: resI.data});
console.log(this.state.insights.insights.data[0].values[1].value); //I Get 270. It working in the parent component

上述语句不应该起作用，因为setState是异步的，并且不会同步更新值。可能显示旧的状态值

setState（）不会立即改变this.state，但会创建挂起的状态转换。调用此方法后访问this.state可能会返回现有值。无法保证对setState调用的同步操作，并且可能会对调用进行批处理以提高性能

在axios完成之前，您可能正在尝试访问

props.insights

const ins = this.props.insights; // probably wait for the axios to complete the fetch before trying to access the value! write it as

console.log(ins && ins.insights); //will give insights once the component rerenders after the props change due to the state being updated in the parent after axios returns!

---

谢谢达南贾。我找到了一种方法，在我发出请求的组件中设置我的所有状态，然后将它们作为道具传递给其他组件。很好用。