EL表达式jsp页面double小数点后保留几位,<fmt:formatNumber>标签

http://blog.youkuaiyun.com/itchiang/article/details/7749081

http://www.runoob.com/jsp/jstl-format-formatnumber-tag.html

<fmt:formatNumber>标签

引入 

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

 <%@ taglib prefix="fmt" uri="http://java.sun.com/jstl/fmt" %>

<fmt:formatNumber type="number" value="${member.loginBonusAmount } " maxFractionDigits="要保留几位"/>

maxFractionDigits：保留几位小数（四舍五入）