我找到了这个问题的解决方案
add_action( \'login_footer\',array($this, \'add_forum_menu\'), 50, 2 );
function add_forum_menu() {
require \'templates/popup.php\';
}
在弹出窗口中。php
<script>
document.getElementById("nav").insertAdjacentHTML("afterbegin","<a href =\'javascript:void(0)\' onclick = clickpop()>custom signup</a>|");
function clickpop()
{
window.open(\'register.php\',\'name\',\'height=500,width=500,toolbar=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=no\'); return false;
}