EL表达式可以直接放在url的“ ”里面

<div class="hc-prm-search search flr">
<form action="/userCenter/projectInfo_4_1.jspx?flag=${flag}" method="post">
[#if flag=="1"]
<input type="text" id="keyword"
name="search_CONTAIN_pname" value="${search_CONTAIN_pname}" />
[#else]
<input type="text" id="keyword"
name="search_CONTAIN_achievement.pname" value="${search_CONTAIN_achievement.pname}" />
[/#if]
<button></button>
</form>
</div>