晕……实在是不明白你的意思。
function add_fun(x1,x2,x3)
{
var sum;
sum = x1 + x2 + x3;
return sum;
}var a=10,b=20,c=30;
var d;
d = add_fun(a,b,c);
function add_fun(x1,x2,x3)
{
var sum;
sum = x1 + x2 + x3;
return sum;
}var a=10,b=20,c=30;
var d;
d = add_fun(a,b,c);
<TABLE>
<tr> <td>a</td><td>b</td><td>c</td><td>result</td>
</tr>
<tr>
<td >
<input type="text" name="a" id="a" size="12" onchange="mul()"></td>
<td >
<input type="text" name="b" id="b" size="12" onchange="mul()">
</td>
<td >
<input type="text" name="c" id="c" size="12" onchange="mul()">
</td>
<td>
<input type="text" name="result" id="result" size="12" ></td>
</tr>
</table>
<script>
function mul(){
r=document.getElementById("a").value*document.getElementById("b").value*document.getElementById("c").value;
document.getElementById("result").value=Math.round(r*10000)/10000;
}
</script>