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<script language="javascript">
function calc(){
document.forms[0].sy.value = document.forms[0].kc.value - document.forms[0].xs.value;
}
</script>
<form name="form" method="post" action="">
ÏúÊÛ£º <input name="ÏúÊÛ" type="text" id="xs" onBlur="calc();" >¿â´æ£º <input name="¿â´æ" type="text" id="kc" onBlur="calc();" value="50" >
Ê£Óࣺ <input name="Ê£Óà" type="text" id="sy" >
</form>

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JScript code:

function calc(){
var n1,n2,n3;
n1=parseInt(document.forms[0].kc.value,10);
n2=parseInt(document.forms[0].xs.value);
n3=n1-n2
if(n3<0) then n3=0;
document.forms[0].sy.value = n3 ;
}



n2=parseInt(document.forms[0].xs.value,10);


ʹÓà Math.max(num1, num2)·½·¨

document.forms[0].sy.value = Math.max(document.forms[0].kc.value - document.forms[0].xs.value, 0);


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<%option explicit%>
<html>
<head> <title>xxx </title> </head>
<script language=vbs>
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