Javascript Prevent Page Hot Reload

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document.onkeydown = function() {    
     switch (event.keyCode) { 
         case 116 : //F5 button
             event.returnValue = false;
             event.keyCode = 0;
             return false; 
         case 82 : //R button
             if (event.ctrlKey) { 
                 event.returnValue = false; 
                 event.keyCode = 0;  
                 return false; 
             } 
     }
 }