HTML表單上的多個輸入值以javascript提交

Question

我希望將值乘以2.50，然后加上1.95（value * 2.50）+1.95。 有沒有辦法用javascript做到這一點？

<form action="" id="formcalculate" method="post" name="formcalculate" >
    <p class="DistanceLable">Distance in miles:</p>
    <p style="position: relative; text-align: center; font-size: 11px">
        <input id="ratecalculator" style="text-align: right; width: 50px; font-weight: bold; font-size: 15px" type="text" value="0"/>
    </p>
    <p style="text-align: center; padding-top: 3px">
        <input id="btnTotal" class="art-button"  type="button" value="Calculate"/>
    </p>
    <p id="totalcalculator" class="totalcalculator" >&nbsp;</p>
</form>

Answer 1

修改以下兩行：

<p class="DistanceLable">Distance in miles: <span id="result"></span></p>
<input id="btnTotal" class="art-button"  type="button" value="Calculate" onclick="document.getElementById('result').innerHTML = (2.50*parseFloat(document.getElementById('ratecalculator').value)+1.95).toFixed(2); " />