一.React-Native一套代码同时运行在IOS和安卓上面

React-Native我们需要写一套代码同时运行在IOS和安卓上面，为了做到这一点我们把index.ios.js和index.android.js中的代码删除掉，然后新建一个

App.js文件，内容如下：

importReact, {Component}from'react';

import{

StyleSheet,

Text,

View

}from'react-native';

classAppextendsComponent{

render() {

return(

Welcome to React Native!

);

}

}

conststyles=StyleSheet.create({

welcome: {

fontSize:20,

textAlign:'center',

margin:10,

},

});

export defaultApp

第二步，修改index.ios.js和index.android.js

修改如下

importReact, {Component}from'react';

import{

StyleSheet,

AppRegistry,

View,

}from'react-native';

importAppfrom'./App'

AppRegistry.registerComponent('ac', () => App);

运行效果如下：无图,