El表達式

1.判斷字符串前兩位部位''
<c:if test="${productresult.productIUCodeN != ''}"></c:if>


2.判斷字符串是否爲null 而且不爲''
<c:if test="${not empty productresult.dynamicAttr.material && productresult.dynamicAttr.material != ''}">
	<dd><span>材質</span><b>${productresult.dynamicAttr.material}</b></dd>
</c:if>


2.截取字符串前兩位,判斷是否等於11
<c:if test="${fn:substring(productresult.productIUCodeN, 0, 2) == '11'}"></c:if>