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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
  <script src="https://cdn.bootcss.com/react/16.4.0/umd/react.production.min.js"></script>
  <script src="https://cdn.bootcss.com/react-dom/16.4.0/umd/react-dom.production.min.js"></script>
  <style>
    .red {color: red;}
    .parent {border: 1px solid #000;}
  </style>
</head>
<body>
  <div id="root"></div>
</body>
</html>
 
let number1 = 0
let number2 = 0
​
let clickAdd1 = () => {
  number1 += 1
  render()
}
let clickAdd2 = () => {
  number1 += 1
  render()
}
​
let clickMinus1 = () => {
  number1 -= 1
  render()
}
let clickMinus2 = () => {
  number2 -= 1
  render()
}
​
​
let Box1 = () => {
  return (
    <div className='parent'>
     <span className='red'>{number1}</span>
     <button onClick={clickAdd1}>+</button>
     <button onClick={clickMinus1}>-</button>
    </div>
  )
}
​
let Box2 = () => {
  return (
    <div className='parent'>
     <span className='red'>{number2}</span>
     <button onClick={clickAdd2}>+</button>
     <button onClick={clickMinus2}>-</button>
    </div>
  )
}
​
render()
​
function render() {
  ReactDOM.render(
   <div>
     <Box1 />
     <Box2 />
   </div>
   ,
   document.querySelector('#root'))
}
​
Output

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Melonxxpro
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