课时8—弹窗modal

首先弹窗的实现效果如下：

主要实现的代码如下：

CSS：

.header,.footer,.wrap-page{
  position:absolute;
  left:0;
  right:0;
  background-color: #fff;
}
.header,.footer{
  height:44px;
  background-color: #fff;
  text-align: center;
  z-index:900;
  line-height:44px;
}
.header{
  top: 0;
  border-bottom: 1px solid #f00;
}
.footer{
  bottom: 0;
  border-top: 1px solid #f00;
}
.page-title{
  line-height:44px;
}
.fl{
  float:left;
}
.fr{
  float: right;
}
.wrap-page{
  top: 44px;
  bottom: 0;
  overflow-y:auto;
  -webkit-overflow-scrolling: touch;
}
.page{
    position: relative;
    padding: 10px;
}
.page p{
    margin-bottom: 10px;
}
.modal-link{
  background-color: #f00;
  color:#fff;
  padding: 10px;
  border-radius:3px;
  display: inline-block;
  cursor: pointer;
}
/* overlay */
.overlay,
.modal .modal-ft {
  display: -webkit-box;
  display: -ms-flexbox;
  display: -webkit-flex;
  display: flex;
}
.overlay {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: -1;
  background-color: rgba(0, 0, 0, 0.8);
  -webkit-box-pack: center;
  -ms-flex-pack: center;
  -webkit-justify-content: center;
  justify-content: center;
  -webkit-box-align: center;
  -ms-flex-align: center;
  -webkit-align-items: center;
  align-items: center;
}
.overlay.active {
  z-index: 980;
}
.modal {
  -webkit-transition: all 0.3s ease-in-out;
  transition: all 0.3s ease-in-out;
}
.modal {
  background-color: #fff;
  border-radius: 5px;
  margin: 0 10px;
  overflow: hidden;
  opacity: 0;
  -webkit-transform: translate3d(0, 0, 0) scale(0.815);
  transform: translate3d(0, 0, 0) scale(0.815);
  -webkit-transition-property: -webkit-transform, opacity;
  transition-property: transform, opacity;
}
.modal.modal-in {
  opacity: 1;
  -webkit-transform: translate3d(0, 0, 0) scale(1);
  transform: translate3d(0, 0, 0) scale(1);
}
.modal .modal-hd {
  text-align: center;
  line-height: 40px;
  background-color: #0078e7;
  color: #fff;
}
.modal .modal-bd {
  padding: 15px;
}
.modal .modal-ft {
  border-top: 1px solid #cccccc;
}
.modal .modal-ft .btn-modal {
  -webkit-box-flex: 1;
  -ms-flex: 1;
  -webkit-flex: 1;
  flex: 1;
  background-color: #fefefe;
  text-align: center;
  line-height: 40px;
  color: #0078e7;
}
.modal .modal-ft .btn-modal:first-child {
  border-right: 1px solid #cccccc;
}
.modal .modal-ft .btn-modal:last-child {
  border-right: none;
}
.modal .modal-ft .btn-modal:hover, .modal .modal-ft .btn-modal:active {
  background-color: #d9d9d9;
}

HTML：

<header id="header" class="header">
        <h1 class="page-title">modal 测试</h1>
    </header>
    <div id="main" class="wrap-page">
        <section class="page">
          <p><span class="modal-link" data-modal="modal-test">点击测试 modal</span></p>    
                   <p>君子曰：学不可以已。</p>
        </section>
    </div>
  <div class="overlay" id="overlay">
    <section class="modal modal-test" style="display:none;">
      <div class="modal-hd">标题</div>
      <div class="modal-bd">
        <p>1青，取之于蓝，而青于蓝；冰，水为之，而寒于水。故木受绳则直，金就砺则利，君子博学而日参省乎己，则知明而行无过矣。</p>
        <p>2青，取之于蓝，而青于蓝；冰，水为之，而寒于水。故木受绳则直，金就砺则利，君子博学而日参省乎己，则知明而行无过矣。</p>
        <p>3青，取之于蓝，而青于蓝；冰，水为之，而寒于水。故木受绳则直，金就砺则利，君子博学而日参省乎己，则知明而行无过矣。</p>
      </div>
      <div class="modal-ft">
        <span class="btn-modal">确认</span><span class="btn-modal">取消</span>
      </div>
    </section>        
  </div>

JavaScript：

$(function(){
  var $overlay = $('#overlay');

  function modalHidden($ele) {
    $ele.removeClass('modal-in');
    $ele.one('transitionend',function(){
      $ele.css({"display": "none"});
      $overlay.removeClass('active');
    });
  }

  $('.modal-link').tap(function(){
    var $that = $(this);
    $overlay.addClass('active');
    var $whichModal = $('.'+$(this).data('modal'));
    $whichModal.animate({"display":"block"},100,function(){
      $(this).addClass('modal-in');
    });

    $('.btn-modal').tap(function(e){
      modalHidden($whichModal);
      e.stopPropagation();
    });
    $overlay.tap(function(e){
     if(e.target.classList.contains('overlay')){
        modalHidden($whichModal);
      }
    });
  });  
});

总结：

移动端背景透明度使用rgba，遮盖层和弹出层可以设计成嵌套模式。