<!DOCTYPE html>
<html lang="zh">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta http-equiv="X-UA-Compatible" content="ie=edge" />
<title>Document</title>
</head>
<body>
<table>
<tr>
<td class="feeFormat">
95.121001
</td>
<td class="feeFormat">
93.543001
</td>
<td class="feeFormat">
22.45345
</td>
<td class="feeFormat">
54543.545
</td>
</tr>
</table>
<script src="jquery.min.js"></script>
<script>
$("table:eq(0) tr").each(function(index, element) {
var a = $(element).children(); //$(element)代表每行tr，后面的children代表tr下面的td，a即这一行所有td的集合
for(var i = 0; i < a.length; i++) {
console.log(a.eq(i).text()); // 取得index为 i的td里面的文本
var num = parseFloat(a.eq(i).text());
var newNum = num.toFixed(2);
a.eq(i).text(newNum);
}
});
</script>
</body>
</html>
原文：http://www.cnblogs.com/TigerZhang-home/p/7459597.html