JSP中使用<c:if>使用后台参数

1)返回list对象中某个对象buyCard某个属性clientState

<c:if test="${buyCard.clientState == null || buyCard.clientState==""}">
	<input readonly="readonly" value="" class="input_text">
</c:if>
<c:if test="${buyCard.dataStatus == 0}">
	<input readonly="readonly" value="否" class="input_text">
</c:if>

2)获取后台request中的参数(request.setAttribute("isComm", isComm);)
<c:if test="${requestScope.isComm}">
    <button class="btn_red" id="save">保存</button> 
</c:if>

这样也可以

	<c:if test="${ messageCounts == 0 }">

3)jsp页面获取request的参数

用小脚本写java代码
<%
request.setCharacterEncoding("UTF-8");
String name = request.getParameter("txt1");
%>
html: 得到值 <%=name %>

4)js引用:

<script>

var  x = "<%=name%>;

alert(x);

</script>

5)js引用request传递过来的集合

alert("${otherBuyCards.size()}");

	var size ="${otherBuyCards.size()}";
	alert(size);

#取不到值，清缓存