正则表达式判定保留2位小数的实现代码

!DOCTYPE html>
html>
head>
meta charset="UTF-8">
title>/title>
script type="text/javascript" src="js/jquery.min.js" >/script>
/head>
body>
li>a class="ba">6.88888888/a>/li>
script>
var b=$('.ba').html();
onload = function(){   
var a = b;
  var aNew;
  var re = /([0-9]+\.[0-9]{2})[0-9]*/;
  aNew = a.replace(re,"$1");
  $(".ba").html(aNew)
 } 
/script>
/body>
/html>