组件名称：Alert、AlertIOS  具体代码如下    

/*弹出层测试*/import React,{Component} from 'react';import {  StyleSheet,  View,  Image,  Text,  TouchableOpacity,  ScrollView,  Navigator,  Alert, //引入Alert组件  TouchableHighlight,  AlertIOS  //引入AlertIOS组件} from 'react-native';//创建一个组件class CustomButton extends Component {  render() {    return (      
     
        //当前触发时间        
      
       {this.props.text}          );  }}//默认输出组件export default class AlertDemo extends Component {  render() {    return (      
       
                
        
                   弹出框实例                //触发事件        
         
          Alert.alert('温馨提醒','确定退出吗?')}          />        
          
           Alert.alert('温馨提醒','确定退出吗?',[            {text:'取消'},            {text:'确定',}            ])}          />        
           
            AlertIOS.alert('温馨提醒','确定退出吗?',[            {text:'One'},            {text:'Two'},            {text:'Two'},            {text:'Two'},            {text:'Two'},            {text:'Two'},            {text:'Two'},            {text:'Two'},            {text:'Two'},            {text:'Two'},            {text:'Two'},            {text:'Two'},            ])}          />          
            
             AlertIOS.prompt('温馨提醒','确定退出吗?',[              {text:'取消'},              {text:'确定',}              ])}            />          );  }}var styles = StyleSheet.create({  container:{    backgroundColor:"#fff",    flex:1,    marginTop:65,},button: {  margin:5,  backgroundColor: 'white',  padding: 15,  borderBottomWidth: StyleSheet.hairlineWidth,  borderBottomColor: '#cdcdcd',}})