<input id="T1" onchange="eval('T3.value=1*T1.value+1*T2.value')" onKeyPress="if(event.keyCode<45||event.keyCode>57){event.returnValue=false;}">
<input id="T2" onchange="eval('T3.value=1*T1.value+1*T2.value')" onKeyPress="if(event.keyCode<45||event.keyCode>57){event.returnValue=false;}">
<input id="T3">
应该差不多.
<input id="T2" onchange="eval('T3.value=1*T1.value+1*T2.value')" onKeyPress="if(event.keyCode<45||event.keyCode>57){event.returnValue=false;}">
<input id="T3">
应该差不多.
<!--
function cal(p1,p2,p3){
_p1=isNaN(p1.value)?0:Number(p1.value)
_p2=isNaN(p2.value)?0:Number(p2.value)
p3.value=_p1+_p2
}
//-->
</script>
<form method=post action="">
<input name=a onblur="cal(this,b,c)">
<input name=b onblur="cal(a,this,c)">
<input name=c>
</form>