关于React的组件

import React from ‘react‘;

function Welcome() {
  return (
    <div>我是一个组件</div>
  );
}

export default Welcome;

import React, {
  Component
} from ‘react‘;

class Welcome extends Component {
  render() {
    return (
      <div>我是一个组件</div>
    );
  }
}

export default Welcome;

import React from ‘react‘;
import ReactDOM from ‘react-dom‘;
import Welcome from ‘./Welcome‘;

ReactDOM.render(
  <Welcome />,
  document.getElementById(‘root‘)
);

import React from ‘react‘;

function Name(props) {
  return (
    <p>我是{props.name}</p>
  );
}

function Age(props) {
  return (
    <p>我{props.age}岁</p>
  );
}

function Sex(props) {
  return (
    <p>我是一个{props.sex}人</p>
  );
}

function Me() {
  return (
    <div>
      <Name name="海牛大大" />
      <Age age="22" />
      <Sex sex="男" />
    </div>
  );
}


export default Me;

import React from ‘react‘;
import ReactDOM from ‘react-dom‘;
import Me from ‘./Me‘;

ReactDOM.render(
  <Me />,
  document.getElementById(‘root‘)
);