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                ## **虛擬DOM描述**: * React 提供了一些 API 來創建一種 “特別” 的一般 js 對象 ```JavaScript var element = React.createElement('h1', {id:'myTitle'},'hello') ``` > 上面創建的就是一個簡單的虛擬 DOM 對象 * 虛擬 DOM 對象最終都會被 React 轉換為真實的 DOM * 我們編碼時基本只需要操作 react 的虛擬 DOM 相關數據, react 會轉換為真實 DOM 變化而更新界面# ## **真實DOM和虛擬DOM的比較:** ```javascript <!DOCTYPE html> <html> <head> <meta charset="UTF-8" /> <title>Hello React!</title> <script src="https://cdn.staticfile.org/react/16.4.0/umd/react.development.js"></script> <script src="https://cdn.staticfile.org/react-dom/16.4.0/umd/react-dom.development.js"></script> </head> <body> <div id="app"></div> <script> console.dir(React) const vDOM=React.createElement('h1',{id:'title',className:'head'},'Hello React') console.dir(vDOM) ReactDOM.render( vDOM, document.getElementById('app') ); const DOM=document.getElementById('title') console.dir(DOM) </script> </body> </html> ```
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