JAVA点击按钮 将Form窗体的hidden属性的true值改为false?

Question

<

 button type="button">管理员登陆</button>
点击管理员登陆这个按钮，将下面的Form窗体的hidden属性值如何变为false
<form action="${ctx}/login.action" id="loginForm" method="post" hidden="true">
                <input type="text" autocomplete="off" id="lname" name="lname" placeholder="用户名"
                    required="required" /> <input type="password" id="pwd" name="pwd"
                    placeholder="密码" required="required" /> <input autocomplete="off" type="text" id="cc"
                    name="cc" placeholder="验证码" required="required" /> 
                    <img src="${ctx}/cc.action" id="img_cc" title="点击更换" style="cursor: pointer;"/>
                <button type="submit" onclick="ss" data-toggle="modal" data-target=".bs-example-modal-lg" class="lo">登录</button>
                <div id="msg">${msg}</div>
                <c:remove var="msg" scope="session"/>
                </form>

Answer 1

 <button type="button" onclick="document.getElementById('loginForm').setAttribute('hidden',false)">管理员登陆</button>