calculator.html

<html>
    <head>
        <title>calculation</title>
    </head>
    <body>
        <input id="result" type="text"/>
        <input id="btnNumber1" type="button"value="1"/> 
        <input id="btnNumber2" type="button"value="2"/> 
        <input id="btnNumber3" type="button"value="3"/> 
        <input id="btnNumber4" type="button"value="4"/> 
        <input id="btnNumber5" type="button"value="5"/> 
        <input id="btnNumber6" type="button"value="6"/> 
        <input id="btnNumber7" type="button"value="7"/> 
        <input id="btnNumber8" type="button"value="8"/> 
        <input id="btnNumber9" type="button"value="9"/> 
        <input id="btnNumber0" type="button"value="0"/> 
        <input id="btnSumption" type="button"value="+"/> 
        <input id="btnMines" type="button"value="-"/> 
        <input id="btnEqual" type="button"value="="/> 
        <script src="calculator.js"></script>
    </body>
</html>