一.js
a.'${pageContext.request.contextPath}'//結果:/projectName
b.'<%=request.getContextPath()%>'//結果:/projectName
用法：
<script>
function searchData(dom){
   $(dom).attr('disabled', true);
   var url = '${pageContext.request.contextPath}/OrderController/getOrders.mmx?'+$('#orderForm').serialize();
   var url = '<%=request.getContextPath()%>'+'/OrderController/getOrders.mmx?'+$('#orderForm').serialize();
   $('#dataDiv').html('資料載入中...').load(url, function(){
      $(dom).attr('disabled', false);
   });
}
<script>
 

二.jsp
a.<%=request.getContextPath()%>//結果:/projectName
b.${pageContext.request.contextPath}//結果:/projectName
用法：
<link rel="stylesheet" type="text/css" href="${pageContext.request.contextPath}/order/css/OrderCss.css" /> 
<link rel="stylesheet" type="text/css" href=<%=request.getContextPath()%>+"/order/css/OrderCss.css" />