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console 命令行工具 X clear 

                    

                        
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console

            
const { useRef, useState, useEffect } = React
function TestRef() {
  const [str, setStr] = useState(111)

  useEffect(() => {
    console.log('a1', str)
  }, [str])
  useEffect(() => {
    console.log('a2', str)
  }, [str])
 
  const change = () => {
    setStr(222)
    setStr(333)
  }
  return (
    <div>
      <div onClick={change}>change</div>
       <div id="btn">show</div>
    </div>
  )
}

ReactDOM.render(<TestRef />, document.getElementById('app'))

            
<div id="app">

</div>

            

                
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