3个文本任意填2个第三个都会自动算出值问题？那位高手帮我解决下

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
  <TITLE> New Document </TITLE>
  <META NAME="Generator" CONTENT="EditPlus">
  <META NAME="Author" CONTENT="">
  <META NAME="Keywords" CONTENT="">
  <META NAME="Description" CONTENT=""> <script type="text/javascript">
function calculated_all()
{
//单价和加油量填写金额自动显示，单价金额填写加油量自动显示，任意填写两项第三项一定要有正确的显示。
var money=document.add.money.value;
var price=document.add.price.value;
var oil=document.add.Oil_content.value;

}function moneyvaluechang(value){
var newmoney=value;
arert(newmoney);
return newmoney;
}
function Calculated_money()
{
/*
var money=document.add.money.value;
var price=document.add.price.value;
var oil=document.add.Oil_content.value;
if(money!=0&&price!=0)
{
if(money!=document.add.a.value&&price!=document.add.b.value)
{
document.add.Oil_content.value=(money/price).toFixed(2);
}else{
}
document.add.a.value=money;
document.add.b.value=price;
document.add.c.value=oil;
}else if(money!=0&&oil!=0)
{
if(money!=document.add.a.value&&oil!=document.add.c.value)
{
document.add.price.value=(money/oil).toFixed(2);}else{}
document.add.a.value=money;
document.add.b.value=price;
document.add.c.value=oil;
}else if(price!=0&&oil!=0)
{
if(price!=document.add.b.value&&oil!=document.add.c.value){
document.add.money.value=(price*oil).toFixed(2);}
document.add.a.value=money;
document.add.b.value=price;
document.add.c.value=oil;
}
*/
var money=document.add.money.value;
var price=document.add.price.value;
var oil=document.add.Oil_content.value;

if(money!=a()&&price!=b())
{
document.add.Oil_content.value=(money/price).toFixed(2);
}else if(money!=a()&&oil!=c())
{
document.add.price.value=(money/oil).toFixed(2);
}else if(price!=b()&&oil!=c())
{

document.add.money.value=(price*oil).toFixed(2);
}else if(money!=a()&&price!=b()&&oil!=c())
{

}
/*
if(money!=a())
{
if(price!=b())
{
document.add.Oil_content.value=(money/price).toFixed(2);
}else if(oil!=c())
{
document.add.price.value=(money/oil).toFixed(2);
}
}else if(price!=b())
{
if(money!=a())
{
document.add.Oil_content.value=(money/price).toFixed(2);
}else if(oil!=c())
{
document.add.money.value=(oil*price).toFixed(2);
}
}else if(oil!=c())
{
if(money!=a())
{
document.add.price.value=(money/oil).toFixed(2);
}else if(price!=c())
{
document.add.money.value=(oil*price).toFixed(2);
}
}else{

}
*/
}
function a()
{
return document.add.a.value;
}
function b()
{
return document.add.b.value;
}
function c()
{
return document.add.c.value;
}
</script>
</HEAD> <BODY>
<form action="apps.php?do=oil&ac=insert&tdo=in" method="post" name="add" id="add" >
单价<input name="price" id="price"  type="text" style="width:120px" value="0" maxlength="3" onKeyUp="Calculated_money()" onclick="b()" />元

加油量：<input name="Oil_content" id="Oil_content"  type="text" style="width:120px" value="0" maxlength="3" onKeyUp="Calculated_money()" onclick="c()" />升
金额：<input name="money" id="money"  type="text" value="0" maxlength="4" style="width:120px" onKeyUp="Calculated_money()"  onclick="a()" />元
<br><input name="a" id="a" value="0" />aa<br>
<br><input name="b" id="b" value="0" />bb<br>
<br><input name="c" id="c"  value="0" />cc<br>
</form>
</BODY>
</HTML>

解决方案 »

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input的onClick改为onChange比较好一点，三个input用同一个onChange处理事件，对三个输入值的判断，两个有值就计算第三个。问一下你的需求，如果三个都输入值，你要计算哪一个？
任意添2个文本另外个文本就能算出值
text1*text2=text3
text3/text1=text2
text3/text2=text1
改变1个值的时候不做处理
当改变2个值的时候处理算出值
如果你输入了text1,text2，计算出了text3值，这时改变text3会怎么样？计算text1？计算text2?
我改变text3的时候不做处理
当我再改变text1的时候才处理得到text2 或者改变text2的时候处理得到text1
<input type='text' value='' id="value1" name="value1"/>
<input type='text' value='' id="value2" name="value2"/>
<input type='text' value='' id="value3" name="value3"/>
<script>
var $ = function($){return document.getElementById($)}
var $addEvent = document.all ? function(dom,ev,fn){dom.attachEvent('on'+ev,fn)}:function(dom,ev,fn,tof){dom.addEventListener(ev,fn,tof)}
$addEvent($('value1'),'keydown',function(event){
var fn;
if($('value3').value){
fn = function(){$('value2').value = ($('value3').value+0) / ($('value1').value+0)}
}
else{
fn = function(){$('value3').value = $('value2').value ? ($('value1').value * $('value2').value) : '';}
}
setTimeout(fn,100);
})
$addEvent($('value2'),'keydown',function(event){
var fn ;
if($('value3').value){
fn = function(){$('value1').value = ($('value3').value+0) / ($('value2').value+0)}
}
else{

fn = function(){$('value3').value = $('value1').value ? ($('value1').value * $('value2').value) : '';}
}
setTimeout(fn,100);
},false)
</script>
你填入value1和value2,value3就有值了.再改value3，将不做任何操作，如再改value1，则value2有变化，再改value2，则value1有变化。
你的需求不是这样的吗？
我要的是填入value1和value2，value3就有值了, 当value3改变了，暂时不做操作，如果在改变value1，那么value3/value1 算出value2
改变1个文本值的时候不操作改变2个文本值的时候猜操作
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title> new document </title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="generator" content="editplus" />
<meta name="author" content="JnKc" />
<meta name="keywords" content="" />
<meta name="description" content="" />
<style type="text/css">
*{font-size:12px;}
</style>
<script type="text/javascript">
function Calculated_money(){
var $ = document.all;
var inall = new Array('price','Oil_content','money'),inyes = [],inno = [];
for (var i in inall){
var obj = $(inall[i]);
obj.value = isNaN(obj.value)||obj.value.length==0?0:obj.value;
if (obj.value==0){
inno.push(inall[i]);
} else{
inyes.push(inall[i]);
}
}
switch (inno.length){
case 0:
alert('不能全部填写，请将欲计算项改为“0”');
return false;
case 1:
switch (inno[0]){
case 'price':
$('price').value = ($('money').value/$('Oil_content').value).toFixed(2);
break;
case 'Oil_content':
$('Oil_content').value = ($('money').value/$('price').value).toFixed(2);
break;
case 'money':
$('money').value = ($('price').value*$('Oil_content').value).toFixed(2);
break;
}
break;
default :
return false;
}
}
</script>
</head>
<body>
<form action="apps.php?do=oil&ac=insert&tdo=in" method="post" name="add" id="add">
单价：<input name="price" id="price"  type="text" style="width:120px" value="0" maxlength="3" onChange="Calculated_money()" />元，
加油量：<input name="Oil_content" id="Oil_content"  type="text" style="width:120px" value="0" maxlength="3" onChange="Calculated_money()" />升，
金额：<input name="money" id="money"  type="text" value="0" maxlength="4" style="width:120px" onChange="Calculated_money()" />元
</form>
</body>
</html>
ps   既然你是要得到金额，为啥不将金额的文本框设定为只读呢，这样不是省很多麻烦，只要value1和value2变动才会变动
<input type='text' value='' id="value1" name="value1" class='nor'/> *
<input type='text' value='' id="value2" name="value2" class='nor'/>  =
<input type='text' value='' id="value3" name="value3" class='nor'/>
<style>
.fcs{
border:1px solid red;
}
.nor{
border:1px solid black;
}
.res{
border:1px solid green;
}
</style>
<script>
var $ = function($){return document.getElementById($)}
var $addEvent = document.all ? function(dom,ev,fn){dom.attachEvent('on'+ev,fn)}:function(dom,ev,fn,tof){dom.addEventListener(ev,fn,tof)}
var c = [];
$addEvent($('value1'),'keydown',function(event){
    var fn;
$('value1').className = 'fcs';
if(c[0] != 'value1')
{
c.push('value1');
if(c.length >= 2){
if(c[0] == 'value3'){
tmp = $('value2');
fn = function(){$('value2').value = ($('value3').value+0) / ($('value1').value+0)}

}
else{
tmp = $('value3');
fn = function(){$('value3').value = $('value2').value ? ($('value1').value * $('value2').value) : '';}
}
setTimeout(fn,100);
tmp.className = 'res';
c=[];
}
}
//if(c.length >=2) c=[];})
$addEvent($('value2'),'keydown',function(event){
    var fn;
$('value2').className = 'fcs';
if(c[0] != 'value2' )
{
c.push('value2');
if(c.length >= 2){
if(c[0] == 'value3'){
tmp = $('value1');
fn = function(){$('value1').value = ($('value3').value+0) / ($('value2').value+0)}
}
else{
tmp = $('value3');
fn = function(){$('value3').value = $('value1').value ? ($('value1').value * $('value2').value) : '';}
}
setTimeout(fn,100);
tmp.className = 'res';
c=[];
}
}
},false)$addEvent($('value3'),'keydown',function(event){
var fn;
$('value3').className = 'fcs';
if(c[0] != 'value3' )
{
c.push('value3');
if(c.length >=2){
if(c[0] == 'value2'){
tmp = $('value1');
fn = function(){$('value1').value = ($('value3').value+0) / ($('value2').value+0)}
}
else{
tmp = $('value2');
fn = function(){$('value2').value = ($('value3').value+0) / ($('value1').value+0)}
}
setTimeout(fn,100);
tmp.className = 'res';
c=[];
}
}},false)</script>