freemaker的函数使用

如下：
<html>
   <body>
      <div class="container">
      <h4>修改用户角色</h4>
<#function contain userList roleTypeId>
	<#local num=0>
	<#list userList as userList>
		<#if userList.roleTypeId ==roleTypeId>
			<#local num = num +1 >
		</#if>
	</#list>
	<#return num>
</#function>
    <form role="form" method="post" action="/userManage/userRoleSave" enctype="multipart/form-data">
        <label class="label-tips" for="u">账号:</label>
        <span >${(userinfo.username)!''}</span><p>
        
        <label class="label-tips" for="nickname">昵称:</label>
        <span >${(userinfo.nickname)!''}</span><p>
                
        <label class="label-tips" for="roles">已有角色:</label><p>
        <#list userinfo.roles as userRoleList>
        <tr>
        	<td>
        		<span >${(userRoleList.roleTypeId)!''}.${(userRoleList.roleName)!''}&nbsp&nbsp&nbsp&nbsp</span>
        	</td>
        </tr>
        </#list><p>
		<label class="label-tips" for="u">修改角色: </label><p>
        <#list roles as rolesList>
        	<input type="checkbox" name="roleTypeIdList"  </#if>>${(rolesList.roleTypeId)!''}.${(rolesList.roleName)!''}&nbsp&nbsp&nbsp&nbsp  			
  	</#list>
        	<input hidden type="text" name="userid" value="${(userinfo.userid)!''}"><p>
        　　　　　<input type="submit" name="修改"/>${(msg?if_exists)!''}
    </form>
    
</div>

</body>
</html>