我如何使用 NetInfo React-Native 专门检查 URL？

Question

这是您当前用于交换和验证连接的代码，我认为它工作正常：

  constructor() {
    super();
    this.state = {
      connection_Status: ""
    }
  }

  componentDidMount() {
    NetInfo.isConnected.addEventListener(
      'connectionChange',
      this._handleConnectivityChange
    );
    NetInfo.isConnected.fetch().done((isConnected) => {
      if (isConnected == true) {
        this.setState({ connection_Status: "Online" })
      }
      else {
        this.setState({ connection_Status: "Offline." })
      }
    });
    SplashScreen.hide();
  }

  componentWillUnmount() {
    NetInfo.isConnected.removeEventListener(
      'connectionChange',
      this._handleConnectivityChange
    );
  }

  _handleConnectivityChange = (isConnected) => {
    if (isConnected == true) {
      this.setState({ connection_Status: "Online" })
    }
    else {
      this.setState({ connection_Status: "Offline." })
    }
  };

如何查看 URL？ 现在想用了，但是实现不了

let req = await fetch('https://www.someurl.com'); let isConnected = req.status === 200;

抱歉，我是 Reacting Native 的新手

Answer 1

获取returns承诺，

因此你可以像这样使用它，

fetch('https://www.someurl.com')
 .then((res) =>{
        this.setState({status:res.status});
     })
    .then((res) => {
      //do somthing with responce
    })
    .catch((error) => {
      console.error(error);
    });