React|React Native NetInfo判断网络状态

import React, { Component } from 'react'; import { AppRegistry, StyleSheet, View, Text, NetInfo, Toast } from 'react-native'; // import NetWorkTool from './src/Net/NetWorkTool'; class Login extends Component { constructor(props){ super(props); this.state={ isConnected:null, connectionInfo:null } }componentDidMount() { //检测网络是否连接 NetInfo.isConnected.fetch().done((isConnected)=>{ this.setState({isConnected}); }); //检测网络连接信息 NetInfo.fetch().done((connectionInfo)=>{ this.setState({connectionInfo}); }); //检测网络变化事件 NetInfo.addEventListener('change',(networkType)=>{ this.setState({isConnected:networkType}) }) } render() { return ( 当前的网络状态: {this.state.isConnected?'网络在线':'离线'} 当前的网络连接类型: {this.state.connectionInfo} 当前连接的网络是否需要计费: {NetInfo.isConnectionExpensive===true?'需要':'不需要'} ); }} const styles = StyleSheet.create({ container: { flex: 1, paddingTop: 30 }, welcome: { fontSize: 16, textAlign: 'left', margin: 10 } });

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