How to disable F5 key on Web Page

If you want to disable F5 key on web page you can use this
JavaScript to disable it.

  document.onkeydown = function()
        {
        if(window.event && window.event.keyCode == 116)
            { 
                window.event.keyCode = 505;
            }
            if(window.event && window.event.keyCode == 505)        
            {
                return false;        
            }
              if(window.event && window.event.keyCode == 8)        
            {
                window.event.keyCode = 0;       
            }
        }

That’s It.
Enjoy Learning.