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我正在使用此代码来计算 2 个字段的乘积并且有很多行，当我只使用一行时，结果将打印在输入字段中。但是当我使用多行输入字段时，结果不会打印到文本框中......我怎么能这样？

代码：

<!DOCTYPE html>
<html>
<head>
<script type="text/javascript">
function updatesum() {
document.input.total.value = (document.input.time.value -0) * (document.input.cost.value -0);
    return false;
}
</script>
</head>
<body>

<form name="input" action="#" method="post" onsubmit="return false;">
Timespent:<input type="text" name="time" value=" ">
Cost:<input type="text" name="cost" value=" ">
Totalcost:<input type="text" name="total" value=" ">
<br>
Timespent:<input type="text" name="time" value=" ">
Cost:<input type="text" name="cost" value=" ">
Totalcost:<input type="text" name="total" value=" ">
<br>
Timespent:<input type="text" name="time" value=" ">
Cost:<input type="text" name="cost" value=" ">
Totalcost:<input type="text" name="total" value=" ">
<br>
Timespent:<input type="text" name="time" value=" ">
Cost:<input type="text" name="cost" value=" ">
Totalcost:<input type="text" name="total" value=" ">
<br>
Timespent:<input type="text" name="time" value=" ">
Cost:<input type="text" name="cost" value=" ">
Totalcost:<input type="text" name="total" value=" ">
<br>
Timespent:<input type="text" name="time" value=" ">
Cost:<input type="text" name="cost" value=" ">
Totalcost:<input type="text" name="total" value=" ">

<input type="submit" value="Submit" onclick="updatesum()">
</form> 

</body>
</html>
4

1 回答 1

1 
function updatesum() {
var totalFields = document.input.time.length;
for(var i=0; i <= totalFields; i++){
    document.input.total[i].value = ( document.input.time[i].value * document.input.cost[i].value);
}
return false; }
于 2013-06-05T10:40:17.187 回答