RN HelloWorld & Lifecycle

HelloWorld：

import React {
  Component,
} from 'react';

import {
  AppRegistry,
  Text,
} from 'react-native';

class helloworld extends Component {
    render() {
        return (
            hello world!
        );
    }
}

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

Lifecycle：

3-3-component-lifecycle.jpg

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