问个关于在keypress中保留两位小数问题

看看，对你有没有作用吧
<!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=gb2312" />
<title>无标题文档</title>
</head><body>
<button onclick="fun()">start</button>
<script type="text/javascript">
function fun()
{
var num = ["-12.12345","4.3456","0.1234"];
for(var i=0;i<num.length;i++)
alert( parseFloat(num[i]).toFixed(2) );

//方法二
for(var i=0;i<num.length;i++)
alert( num[i].replace( /(^-?\d+(?:\.\d{1,2})?).*$/g,"$1" ) );
}
</script>
</body>
</html>