jQuery的问题，啦啦！！！！！！

Question

如图片公式那样计算

 function votecalculator(price, amount,poundage1){
    price = parseFloat(price) || 0;
    amount = parseFloat(amount) || 0;
    poundage1 = parseFloat(poundage1) || 0;

    var money2 = 0;
    poundage = price*amout*(poundage1/100);
    $("#poundage").val(poundage.toFixed(2));
}




    $("#price").change(function () {
        price = parseFloat($(this).val());
        votecalculator(price, amount,poundage1);
    });
    $("#amount").change(function () {
        amount = parseFloat($(this).val());
        votecalculator(price, amount,poundage1);
    });
    $("#poundage1").change(function () {
        poundage1 = parseFloat($(this).val());
        votecalculator(price, amount,poundage1);
    });



    var price = parseFloat($("#price").val());
    var amount = parseFloat($("#amount").val());
    var poundage1 = parseFloat($("#poundage1").val());

    votecalculator(price, amount,poundage1);

这是我的js 我只是计算了手续费 但是无法计算 不知道怎么回事 还有就是$(document).ready() 就计算不了 必须删除才能计算 还有就是 我想给他 同时计算 填完数量跟价格 金额和手续费都出现 就是在js里先计算手续费 完了手续费有值了也计算 金额 但是要页面要同时出现结果的 用什么 if（）{}吗

Answer 1

<script type="text/javascript" src="http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.11.1.min.js"></script>
<div>
    价格：<input type="text" id="price" />元/份<br />
    数量：<input type="text" id="amount" />份
</div>
计算结果
<hr />
<table id="tbRst">
    <tr><td>&nbsp;</td><td>金额</td><td>手续费</td><td>手续费率</td></tr>
    <tr><td>申购</td><td><input type="text" />元</td><td><input type="text" />元</td><td><input type="text" value="1.5" id="poundage1" />%</td></tr>
    <tr><td>认购</td><td><input type="text" />元</td><td><input type="text" />元</td><td><input type="text" value="1.2" id="poundage2" />%</td></tr>
    <tr><td>赎回</td><td><input type="text" />元</td><td><input type="text" />元</td><td><input type="text" value="0.5" id="poundage3" />%</td></tr>
</table>
<script>
    function votecalculator() {
        var price = parseFloat($('#price').val()) || 0, amount = parseFloat($('#amount').val()) || 0, poundage,percent;
        var ipts, money = price * amount;
        $('#tbRst tr:gt(0)').each(function () {
            ipts = $('input', this);
            percent = parseFloat(ipts.eq(2).val()) || 0;
            poundage = money * percent / 100;
            ipts.eq(0).val((money + poundage).toFixed(2));
            ipts.eq(1).val(poundage.toFixed(2));
        });
    }
    $('#price,#amount,#poundage1,#poundage2,#poundage3').change(votecalculator);
</script>