jquery 按下回车键触发按钮点击

<div class="btnbox">
  <div class="cg-Btn big" id="btnlogin" set-i18n="Home-Login:text">登&nbsp;&nbsp;录</div>
</div>
//回车键
  document.onkeydown = function (e) {
    if (!e) e = window.event;
    if (((e.keyCode || e.which) == 13)) {
      if ($('.CPWArea').is(':hidden') === true) {
        $('#btnlogin').trigger('click');
      } else {
        $('#btnChangePW').trigger('click');
      }
    }
  };