设置输入字段的值

Question

<script>
function doMath() {
    var labor = parseInt(document.getElementById('prod_price').value);
    var tax = labor * .10;

    document.getElementById('prod_description').value = tax;
}
</script>
<div>Price: <input type="text" id="prod_price" onBlur="doMath();" /></div>
<div>Tax: <input type="text" id="prod_description" readonly="true" /></div>

如何制作这个...如果价格低于100，那么税必须显示为5 如果价格高于100，那么税必须是20

Answer 1

试试这个..

function doMath() {
    var labor = parseInt(document.getElementById('prod_price').value);
    if(labor<100)
    {
        document.getElementById('prod_description').value = "5";
    }
    else if(labor>100)
    {
        document.getElementById('prod_description').value = "20";
    }
}