将OneSignal的react-native代码转化为reactjs代码。

在react-native中使用OneSignal的代码与在reactjs中使用OneSignal的代码之间存在一些差异。在react-native中需要导入相应的包并将代码添加到组件的生命周期中，而在reactjs中则不需要导入包。取而代之的是，可以在组件最顶层的App.js中初始化OneSignal。

以下是将OneSignal的react-native代码转化为reactjs代码的示例：

在react-native中的代码：

import OneSignal from 'react-native-onesignal';

class App extends React.Component {
  constructor(properties) {
    super(properties);

    OneSignal.init("YOUR_ONESIGNAL_APP_ID");
    OneSignal.addEventListener('received', this.onReceived);
    OneSignal.addEventListener('opened', this.onOpened);
    OneSignal.addEventListener('ids', this.onIds);
  }

  componentWillUnmount() {
    OneSignal.removeEventListener('received', this.onReceived);
    OneSignal.removeEventListener('opened', this.onOpened);
    OneSignal.removeEventListener('ids', this.onIds);
  }

  onReceived(notification) {
    console.log("Notification received: ", notification);
  }

  onOpened(openResult) {
    console.log('Message: ', openResult.notification.payload.body);
    console.log('Data: ', openResult.notification.payload.additionalData);
    console.log('isActive: ', openResult.notification.isAppInFocus);
    console.log('openResult: ', openResult);
  }

  onIds(device) {
    console.log('Device info: ', device);
  }

  render() {
    return <View />;
  }
}

在reactjs中的代码：

import OneSignal from 'react-onesignal';

class App extends React.Component {
  constructor(props) {
    super(props);

    OneSignal.initialize('YOUR_ONESIGNAL_APP_ID');
    OneSignal.on('notificationReceived', this.onReceived);
    OneSignal.on('opened', this.onOpened);
    OneSignal.on('ids', this.onIds);
  }

  componentWillUnmount() {
    OneSignal.off('notificationReceived', this.onReceived);
    OneSignal.off('opened', this.onOpened);
    OneSignal.off('ids', this.onIds);
  }

  onReceived = notification => {
    console.log("Notification received:", notification);
  };

  onOpened = openResult => {
    console.log('Message:', openResult.notification.payload.body);
    console.log('Data:', openResult.notification.payload.additionalData);
    console.log('isActive:', openResult.notification.isAppInFocus);
    console.log('openResult:', openResult);
  };

  onIds = device => {
    console.log('Device info:', device);
  };

  render() {
    return <div />;
  }
}

需要注意的是，由于OneSignal的react-native和reactjs的API和参数略有不同，因此需要相应地进行更改。例如，在react-native中，需要使用OneSignal.addEventListener()和OneSignal.removeEventListener()来添加和移除事件监听器，而在reactjs中，则需要使用OneSignal.on()和OneSignal.off()。同时，由于react-native中使用的是View组件，而在reactjs中则需要使用div组件。