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https://blog.csdn.net/zhaofuqiangmycomm/article/details/79442730
EL表達(dá)式判斷是否為空，判斷是否為空字符串
El表達(dá)式判斷是否為空字符串 ${empty 值} 返回true ,表示為空字符串;
<c:if test=" ${empty basicTree.phone} "> <td>wwww </td> </c:if>
El表達(dá)式判斷是否為空 ${值 eq null } 返回true 的話，表示為空 <c:if test="${basicTree.phone eq null }"> <td>mmmm</td> </c:if> 雙保險(xiǎn)判斷不為空 <c:if test="${not empty basicTree.phone && !(basicTree.phone eq null) }"> |
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