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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
   <div class="press-wrap">
     <button onClick="dev_onoff()">ON/OFF Test</button>
   </div>
  
  <div class="view"></div>
  
</body>
</html>
 
var view = document.querySelector('.view');
var cnt = 0;
function dev_onoff(){
  if(cnt==0){
    view.classList.add('on');
    cnt++;
  }
  else{
    view.classList.remove('on');
    cnt--;
  }
}
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ferrari219pro
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