多个文本框里的数据相加?(0分)

慕

慕荣冰靖

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GUEST, unregistred user!

• 2003-07-17

• #1

function changequatity()
{
var sum=0,i;
for (i=1;i<4;i++)
{
sum+=document.form2.quatity.value*document.form2.prices.value;
}
document.form2.sum.value=sum;
}
我用这段代码求文本框quatity1...3里的数据相加和sum.怎么quatity不会随着 i 循环而相加呢?

 

慕

慕荣冰靖

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GUEST, unregistred user!

• 2003-07-17

• #2

如果我用了:
sum+=document.form2.quatity+"i".value*document.form2.prices+"i".value;
结果document.form2.sum.value=NaN是怎么回事?

 

R

rexchina

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• 2003-07-17

• #3

function changequatity()
{
var sum=0,i;
for (i=1;i<4;i++)
{
quatity = eval(“document.form2.quatity”+i);
prices = eval(“document.form2.prices ”+i);
sum+=quatity.value*prices.value;
}
document.form2.sum.value=sum;
}
这样试试

 

慕

慕荣冰靖

Unregistered / Unconfirmed

GUEST, unregistred user!

• 2003-07-17

• #4

结果一样,都是sum=NaN