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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<script language="javascript">
<!--
function getResult()
{
var contdition = document.getElementById('E').value;
var strA = document.getElementById('A').value;
var strB = document.getElementById('B').value;
var strC = document.getElementById('C').value;
eval('var strResult=' +contdition.replace('A',strA).replace('B',strB).replace('C',strC));
document.getElementById('S').value = strResult;
}
// -->
</script>
</HEAD>
<BODY>
A:<input id="A" type="text" name="A" /></br>
B:<input id="B" type="text" name="B" /></br>
C:<input id="C" type="text" name="C" /></br>
表达式:<input id="E" type="text" name="E" /></br>
总数:<input id="S" type="text" name="S" onfocus="getResult();" /></br>
</BODY>
</HTML>