<!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>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
</head>
<body >
<table width="356" height="140" border="1">
<tr>
<td width="168" align="center" valign="middle">产品</td>
<td width="172" align="center" valign="middle">单价</td>
</tr>
<tr>
<td align="center" valign="middle">铅笔</td>
<td id='product1' align="center" valign="middle">100</td>
</tr>
<tr>
<td align="center" valign="middle">橡皮擦</td>
<td id='product2' align="center" valign="middle">200</td>
</tr>
<tr>
<td align="center" valign="middle">合计</td>
<td id='sum' align="center" valign="middle" onclick="sum()"></td>
</tr>
</table>
</body>
</html>
<script type="text/javascript">
function sum(){
var product1 = document.getElementById('product1').innerText;
var product2 = document.getElementById('product2').innerText;
//alert(product1+' '+product2)
var sum = parseInt(product1) + parseInt(product2);
document.getElementById('sum').innerText = sum;
}
window.onload = sum
</script>
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