<!DOCTYPE html> <html> <body> <form> <input type="text" id="number" value="0"/> <input type="button" onclick="incrementValue()" value="Increase" /> </form> <script> function incrementValue() { var value = parseInt(document.getElementById('number').value, 10); value = isNaN(value) ? 0 : value; value++; document.getElementById('number').value = value; } </script> </body> </html>
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