index.android.js

/**
 * Sample React Native App
 * https://github.com/facebook/react-native
 * @flow
 * 官网demo-->https://github.com/mobxjs/mobx-react-boilerplate
 */

import React, { Component } from 'react';
import {
  AppRegistry,
  StyleSheet,
  Text,
  View,
  TouchableOpacity
} from 'react-native';

import NewApp from './app';
// import AppState from './appState';

// const appState = new AppState();

import {observable,autorun,computed} from 'mobx';

var appState = observable({
   timer : 0 ,
  //  get zijipao(){
  //     setInterval(()=>{
  //           this.timer += 1;
  //       },1000)
  //  } 

  zijipao : computed(function(){
    setInterval(()=>{this.timer += 1;},1000)
  })
})

import {action} from 'mobx';

appState.resetTimer = action(function reset() {
    appState.timer = 0;
});

// setInterval(action(function tick() {
//     appState.timer += 1;
// }), 1000);

autorun(function() {
    // console.log("Completed %d of %d items",
        appState.zijipao
    // );
});

export default class Proj extends Component {
  render() {
    return (
      <NewApp appState={appState}/>
    );
  }
}


AppRegistry.registerComponent('Proj', () => Proj);



//经验法则：如果你有一个函数应该自动运行，但不会产生一个新的值，请使用autorun。 其余情况都应该使用 computed。