我想问我如何获得
的小计fullpayment * penalty = answer + fullpayment =小计
和全额付款*折扣=答案-全额付款=小计
或同时执行并自动计算。
我只是编程的新手，希望有人可以帮助我，我有一段代码，但运行得并不理想。预先感谢您的帮助！
代码如下：
<tbody>
<td><input type="text" id='fpay0' name='fullpay[]' class="form-control fpay payment"/></td>
<td><input type="text" id='penalty0' name='penalty[]' class="form-control penalty payment"></td>
<td><input type="text" id='discount0' name='discount[]' class="form-control discount payment"></td>
<td><input type="text" name='subtotal[]' class="form-control numeric_value0 subtotal"></td>
</tbody>
<tfooter>
<td><input type="text" id="total" name="grandtotal" class="form-control"readonly></td>
</tfooter>
<script>
$(document).ready(function(){
var i=1;
$("#add_row").click(function(){
$('#addr'+i).html("<td>"+ (i+1) +"</td><td><select class='form-control show-tick' name='classi[]"+i+"' required><option value=''>-- Please select --</option><option value='Agri'>Agri</option><option value='Resi - Bldg'>Resi - Bldg</option><option value='Resi - Lot'>Resi - Lot</option><option value='Comm'>Comm</option><option value='Indtl'>Indtl</option></select></td><td><select class='form-control show-tick' name='brgy[]"+i+"' required><option value=''>-- Please select --</option><option value='BALLUAY'>BALLUAY</option><option value='BAGONG'>BAGONG</option><option value='BANANGAN'>BANANGAN</option><option value='BANENGBENG'>BANENGBENG</option><option value='BAYABAS'>BAYABAS</option><option value='PAPPA'>PAPPA</option><option value='KAMOG'>KAMOG</option><option value='POBLACION'>POBLACION</option></select></td><td><input name='year[]"+i+"' type='text' class='form-control input-md' required></td><td><input name='nameown[]"+i+"' type='text' class='form-control input-md' required></td><td><input name='location[]"+i+"' type='text' class='form-control input-md'></td><td><input name='taxdecno[]"+i+"' type='text' class='form-control input-md'></td><td><input name='avland[]"+i+"' type='text' class='form-control input-md'></td><td><input name='avtotal[]"+i+"' type='text' class='form-control input-md'></td><td><input name='taxdue[]"+i+"' type='text' class='form-control input-md'></td><td><select class='form-control show-tick' name='insno[]"+i+"' required><option value=''>-- Please select --</option><option value='1st Qtr'>1st Qtr</option><option value='2nd Qtr'>2nd Qtr</option><option value='3rd Qtr'>3rd Qtr</option><option value='4th Qtr'>4th Qtr</option><option value='Ja-June'>Ja-June</option><option value='July-Dec'>July-Dec</option><option value='Annual'>Annual</option></select></td><td><input name='fullpay[]"+i+"' id='fpay"+i+"' type='text' class='form-control input-md fpays paym'></td><td><input name='penalty[]"+i+"' id='penalty"+i+"' type='text' class='form-control input-md penalty paym'></td><td><input name='discount[]"+i+"' id='discount"+i+"' type='text' class='form-control input-md discount paym'></td><td><input name='subtotal[]"+i+"' type='text' class='form-control numeric_value"+i+" subtotal'></td>");
$('#tab_logic').append('<tr id="addr'+(i+1)+'"></tr>');
i++;
$('.numeric_value').keyup(function() {
var sum = 0;
$('.numeric_value').each(function() {
sum += Number($(this).val());
});
sums = sums*2;
$('#total').val(sum.toFixed(2));
$('#tes').val(combines($('#total').val()));
});
$('.paym').change(function() {
var sum = 0;
for(var x=0;x<$('.fpays').length;x++){
var y = Number(x)+1;
var f = $('#fpay'+y).val();
var p = $('#penalty'+y).val();
var d = $('#discount'+y).val();
sum = Number(f) + Number(p) - d;
$('.numeric_value'+y).val(sum.toFixed(2));
}
var sums = 0;
$('.subtotal').each(function() {
sums += Number($(this).val());
});
sums = sums*2;
$('#total').val(sums.toFixed(2));
$('#tes').val(combines($('#total').val()));
});
});
$('.payment').change(function() {
var sum = 0;
var f = $('#fpay0').val();
var p = $('#penalty0').val();
var d = $('#discount0').val();
sum = Number(f) + Number(p) - d;
$('.numeric_value0').val(sum.toFixed(2));
var sums = 0;
$('.subtotal').each(function() {
sums += Number($(this).val());
});
sums = sums*2;
$('#total').val(sums.toFixed(2));
$('#tes').val(combines($('#total').val()));
});
$("#delete_row").click(function(){
if(i>1){
$("#addr"+(i-1)).html('');
i--;
}
});
});
</script>