<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>025</title>
</head>
<body>
<div id="content-">
<table id="table-">
<tr>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>2</td>
<td>2</td>
</tr>
<tr>
<td>3</td>
<td>3</td>
</tr>
<tr>
<td>4</td>
<td>4</td>
</tr>
<tr>
<td>5</td>
<td>5</td>
</tr>
<tr>
<td>6</td>
<td>6</td>
</tr>
</table>
</div>
<div id="sum"></div>
</body>
<script type="text/javascript">
var sum = 0;
var cells = document.querySelectorAll("td + td");
[].forEach.call(cells,function(cell){
sum+=parseFloat(cell.firstChild.data);
});
console.log(sum);
document.getElementById('sum').innerHTML='sum=' + sum;
</script>
</html>
