<nav class="main_nav"> 
  <ul> 
    <li><a class="cd-signin" href="#0">登錄</a></li> 
    <li><a class="cd-signup" href="#0">注冊(cè)</a></li> 
  </ul> 
</nav> 

 
<div class="cd-user-modal"> 
  <div class="cd-user-modal-container"> 
    <ul class="cd-switcher"> 
      <li><a href="#0">用戶(hù)登錄</a></li> 
      <li><a href="#0">注冊(cè)新用戶(hù)</a></li> 
    </ul> 
 
    <div id="cd-login"> 
      <form class="cd-form"> 
        <!-- 登錄表單 --> 
      </form> 
    </div> 
 
    <div id="cd-signup"> 
      <form class="cd-form"> 
        <!-- 注冊(cè)表單 --> 
      </form> 
    </div>     
  </div> 
</div> 

 
.cd-user-modal { 
 position: fixed; 
 top: 0; 
 left: 0; 
 width: 100%; 
 height: 100%; 
 background: rgba(52, 54, 66, 0.9); 
 z-index: 3; 
 overflow-y: auto; 
 cursor: pointer; 
 visibility: hidden; 
 opacity: 0; 
 -webkit-transition: opacity 0.3s 0, visibility 0 0.3s; 
 -moz-transition: opacity 0.3s 0, visibility 0 0.3s; 
 transition: opacity 0.3s 0, visibility 0 0.3s; 
} 
.cd-user-modal.is-visible { 
 visibility: visible; 
 opacity: 1; 
 -webkit-transition: opacity 0.3s 0, visibility 0 0; 
 -moz-transition: opacity 0.3s 0, visibility 0 0; 
 transition: opacity 0.3s 0, visibility 0 0; 
} 
.cd-user-modal.is-visible .cd-user-modal-container { 
 -webkit-transform: translateY(0); 
 -moz-transform: translateY(0); 
 -ms-transform: translateY(0); 
 -o-transform: translateY(0); 
 transform: translateY(0); 
} 
 
.cd-user-modal-container { 
 position: relative; 
 width: 90%; 
 max-width: 600px; 
 background: #FFF; 
 margin: 3em auto 4em; 
 cursor: auto; 
 border-radius: 0.25em; 
 -webkit-transform: translateY(-30px); 
 -moz-transform: translateY(-30px); 
 -ms-transform: translateY(-30px); 
 -o-transform: translateY(-30px); 
 transform: translateY(-30px); 
 -webkit-transition-property: -webkit-transform; 
 -moz-transition-property: -moz-transform; 
 transition-property: transform; 
 -webkit-transition-duration: 0.3s; 
 -moz-transition-duration: 0.3s; 
 transition-duration: 0.3s; 
} 
.cd-user-modal-container .cd-switcher:after { 
 content: ""; 
 display: table; 
 clear: both; 
} 
.cd-user-modal-container .cd-switcher li { 
 width: 50%; 
 float: left; 
 text-align: center; 
} 
.cd-user-modal-container .cd-switcher li:first-child a { 
 border-radius: .25em 0 0 0; 
} 
.cd-user-modal-container .cd-switcher li:last-child a { 
 border-radius: 0 .25em 0 0; 
} 
.cd-user-modal-container .cd-switcher a { 
 display: block; 
 width: 100%; 
 height: 50px; 
 line-height: 50px; 
 background: #d2d8d8; 
 color: #809191; 
} 
.cd-user-modal-container .cd-switcher a.selected { 
 background: #FFF; 
 color: #505260; 
} 
 
#cd-login, #cd-signup { 
 display: none; 
} 
 
#cd-login.is-selected, #cd-signup.is-selected{ 
 display: block; 
} 

jQuery(document).ready(function($){ 
  var $form_modal = $('.cd-user-modal'), 
    $form_login = $form_modal.find('#cd-login'), 
    $form_signup = $form_modal.find('#cd-signup'), 
    $form_modal_tab = $('.cd-switcher'), 
    $tab_login = $form_modal_tab.children('li').eq(0).children('a'), 
    $tab_signup = $form_modal_tab.children('li').eq(1).children('a'), 
    $main_nav = $('.main_nav'); 
 
  //彈出窗口 
  $main_nav.on('click', function(event){ 
 
    if( $(event.target).is($main_nav) ) { 
      // on mobile open the submenu 
      $(this).children('ul').toggleClass('is-visible'); 
    } else { 
      // on mobile close submenu 
      $main_nav.children('ul').removeClass('is-visible'); 
      //show modal layer 
      $form_modal.addClass('is-visible');   
      //show the selected form 
      ( $(event.target).is('.cd-signup') ) ? signup_selected() : login_selected(); 
    } 
 
  }); 
 
  //關(guān)閉彈出窗口 
  $('.cd-user-modal').on('click', function(event){ 
    if( $(event.target).is($form_modal) || $(event.target).is('.cd-close-form') ) { 
      $form_modal.removeClass('is-visible'); 
    }   
  }); 
  //使用Esc鍵關(guān)閉彈出窗口 
  $(document).keyup(function(event){ 
    if(event.which=='27'){ 
      $form_modal.removeClass('is-visible'); 
    } 
  }); 
 
  //切換表單 
  $form_modal_tab.on('click', function(event) { 
    event.preventDefault(); 
    ( $(event.target).is( $tab_login ) ) ? login_selected() : signup_selected(); 
  }); 
 
  function login_selected(){ 
    $form_login.addClass('is-selected'); 
    $form_signup.removeClass('is-selected'); 
    $form_forgot_password.removeClass('is-selected'); 
    $tab_login.addClass('selected'); 
    $tab_signup.removeClass('selected'); 
  } 
 
  function signup_selected(){ 
    $form_login.removeClass('is-selected'); 
    $form_signup.addClass('is-selected'); 
    $form_forgot_password.removeClass('is-selected'); 
    $tab_login.removeClass('selected'); 
    $tab_signup.addClass('selected'); 
  } 
 
});