Summersblue的博客

npm install --glocal create-react-app create-react-app first_react_app cd first_react_app npm start visit http://localhost:3000/

src/index.jsimport React from 'react'; import ReactDOM from 'react-dom'; import App from './App'; import ClickCounter from './ClickCounter'; import registerServiceWorker from './registerServiceWorker';

判断一个元素是HTML还是React组件的原则就是看第一个字母是否大写，import React,{Component} from 'react'; class ClickCounter extends Component{ constructor(props){ super(props); this.onClickButton = this.onClickButton.bind