Immediate Value Acquisition(not .oninput)

HTML

    <p><input type="text" id="data1" name="data1" /></p>
    <p><input type="text" id="data2" name="data2" /></p>
    <p id="result"></p>

JAVASCRIPT

        var result;
        result = document.getElementById("result");
        times = setInterval(process, 1000);
        function process(){
            var data1, data2, resultValue;
            data1 = Number(document.getElementById("data1").value);
            data2 = Number(document.getElementById("data2").value);
            resultValue = data1 * data2;
            result.innerHTML = resultValue;
        }