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启动页是图片过渡两秒，componentWillUnmount()
需要清除定时器

'use strict';import React from 'react';import {  Dimensions,  Image,  InteractionManager,  View,  Text,} from 'react-native';import AppMain from './AppMain';var {height, width} = Dimensions.get('window');class Splash extends React.Component {  constructor(props) {    super(props);  }  componentDidMount() {    const {navigator} = this.props;     this.timer=setTimeout(() => {      InteractionManager.runAfterInteractions(() => {        navigator.resetTo({          component: AppMain,          name: 'AppMain'        });      });    }, 2500);  }  componentWillUnmount() {    this.timer && clearTimeout(this.timer);  }  render() {    return (      
         
          
       );  }}export default Splash;

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