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    弹出层和弹窗相似但是并不相同；弹窗和弹出层都是由用户触发的显示提示信息的弹出面板；但是弹窗只是显示一些信息，没有太多的复杂的交互事件；而弹层类似一个整个页面，可以实现页面的所有功能；

    现在前端弹层使用的很频繁，如支付宝支付弹层等…所以掌握弹层是一个很重要的技能。如果只是简单的隐藏和切换，当然就不必说，我要说的html+animate+es6实现弹层；


    html弹层结构：

    <main class="main">
 <header class="head flex-center gray-theme">This is Header</header>
 <section class="body flex-center">
  <ul class="btn-list flex-center btn-group">
  <li class="btn-box"><span class="btn inline-flex-center" data-position="top">上弹层</span></li>
  <li class="btn-box"><span class="btn inline-flex-center" data-position="right">右弹层</span></li>
  <li class="btn-box"><span class="btn inline-flex-center" data-position="bottom">下弹层</span></li>
  <li class="btn-box"><span class="btn inline-flex-center" data-position="left">左弹层</span></li>
  </ul>
 </section>
 <footer class="foot flex-center gray-theme">This is Footer</footer>
 <!-- popup -->
 <section class="popup flex-center hide hidden">
  <section class="popup-bg"></section>
  <section class="popup-wrapper">
  <header class="title head flex-center"></header>
  <section class="container body flex-center"></section>
  <footer class="btn-wrapper foot flex-center">
   <ul class="btn-list flex-center">
   <li class="btn-box"><span class="btn cancel inline-flex-center">取消</span></li>
   <li class="btn-box"><span class="btn confirm inline-flex-center">确认</span></li>
   </ul>
  </footer>
  </section>
 </section>
</main>

    css代码：

    @mixin slide-top{
 0%{
 -webkit-transform: translate3d(0, -400%, 0);
 -moz-transform: translate3d(0, -400%, 0);
 -ms-transform: translate3d(0, -400%, 0);
 -o-transform: translate3d(0, -400%, 0);
 transform: translate3d(0, -400%, 0);
 }
 100%{
 -webkit-transform: translate3d(0, 0, 0);
 -moz-transform: translate3d(0, 0, 0);
 -ms-transform: translate3d(0, 0, 0);
 -o-transform: translate3d(0, 0, 0);
 transform: translate3d(0, 0, 0);
 }
}

@keyframes slideTop{
 @include slide-top;
}

@-webkit-keyframes slideTop{
 @include slide-top;
}

@mixin slide-top-hide{
 0%{
 -webkit-transform: translate3d(0, 0, 0);
 -moz-transform: translate3d(0, 0, 0);
 -ms-transform: translate3d(0, 0, 0);
 -o-transform: translate3d(0, 0, 0);
 transform: translate3d(0, 0, 0);
 }
 100%{
 -webkit-transform: translate3d(0, -400%, 0);
 -moz-transform: translate3d(0, -400%, 0);
 -ms-transform: translate3d(0, -400%, 0);
 -o-transform: translate3d(0, -400%, 0);
 transform: translate3d(0, -400%, 0);
 }
}

@keyframes slideTopHide{
 @include slide-top-hide;
}

@-webkit-keyframes slideTopHide{
 @include slide-top-hide;
}

@mixin slide-right{
 0%{
 -webkit-transform: translate3d(400%, 0, 0);
 -moz-transform: translate3d(400%, 0, 0);
 -ms-transform: translate3d(400%, 0, 0);
 -o-transform: translate3d(400%, 0, 0);
 transform: translate3d(400%, 0, 0);
 }
 100%{
 -webkit-transform: translate3d(0, 0, 0);
 -moz-transform: translate3d(0, 0, 0);
 -ms-transform: translate3d(0, 0, 0);
 -o-transform: translate3d(0, 0, 0);
 transform: translate3d(0, 0, 0);
 }
}

@keyframes slideRight{
 @include slide-right;
}

@-webkit-keyframes slideRight{
 @include slide-right;
}

@mixin slide-right-hide{
 0%{
 -webkit-transform: translate3d(0, 0, 0);
 -moz-transform: translate3d(0, 0, 0);
 -ms-transform: translate3d(0, 0, 0);
 -o-transform: translate3d(0, 0, 0);
 transform: translate3d(0, 0, 0);
 }
 100%{
 -webkit-transform: translate3d(400%, 0, 0);
 -moz-transform: translate3d(400%, 0, 0);
 -ms-transform: translate3d(400%, 0, 0);
 -o-transform: translate3d(400%, 0, 0);
 transform: translate3d(400%, 0, 0);
 }
}

@keyframes slideRightHide{
 @include slide-right-hide;
}

@-webkit-keyframes slideRightHide{
 @include slide-right-hide;
}

@mixin slide-bottom{
 0%{
 -webkit-transform: translate3d(0, 400%, 0);
 -moz-transform: translate3d(0, 400%, 0);
 -ms-transform: translate3d(0, 400%, 0);
 -o-transform: translate3d(0, 400%, 0);
 transform: translate3d(0, 400%, 0);
 }
 100%{
 -webkit-transform: translate3d(0, 0, 0);
 -moz-transform: translate3d(0, 0, 0);
 -ms-transform: translate3d(0, 0, 0);
 -o-transform: translate3d(0, 0, 0);
 transform: translate3d(0, 0, 0);
 }
}

@keyframes slideBottom{
 @include slide-bottom;
}

@-webkit-keyframes slideBottom{
 @include slide-bottom;
}

@mixin slide-bottom-hide{
 0%{
 -webkit-transform: translate3d(0, 0, 0);
 -moz-transform: translate3d(0, 0, 0);
 -ms-transform: translate3d(0, 0, 0);
 -o-transform: translate3d(0, 0, 0);
 transform: translate3d(0, 0, 0);
 }
 100%{
 -webkit-transform: translate3d(0, 400%, 0);
 -moz-transform: translate3d(0, 400%, 0);
 -ms-transform: translate3d(0, 400%, 0);
 -o-transform: translate3d(0, 400%, 0);
 transform: translate3d(0, 400%, 0);
 }
}

@keyframes slideBottomHide{
 @include slide-bottom-hide;
}

@-webkit-keyframes slideBottomHide{
 @include slide-bottom-hide;
}

@mixin slide-left{
 0%{
 -webkit-transform: translate3d(-400%, 0, 0);
 -moz-transform: translate3d(-400%, 0, 0);
 -ms-transform: translate3d(-400%, 0, 0);
 -o-transform: translate3d(-400%, 0, 0);
 transform: translate3d(-400%, 0, 0);
 }
 100%{
 -webkit-transform: translate3d(0, 0, 0);
 -moz-transform: translate3d(0, 0, 0);
 -ms-transform: translate3d(0, 0, 0);
 -o-transform: translate3d(0, 0, 0);
 transform: translate3d(0, 0, 0);
 }
}

@keyframes slideLeft{
 @include slide-left;
}

@-webkit-keyframes slideLeft{
 @include slide-left;
}

@mixin slide-left-hide{
 0%{
 -webkit-transform: translate3d(0, 0, 0);
 -moz-transform: translate3d(0, 0, 0);
 -ms-transform: translate3d(0, 0, 0);
 -o-transform: translate3d(0, 0, 0);
 transform: translate3d(0, 0, 0);
 }
 100%{
 -webkit-transform: translate3d(-400%, 0, 0);
 -moz-transform: translate3d(-400%, 0, 0);
 -ms-transform: translate3d(-400%, 0, 0);
 -o-transform: translate3d(-400%, 0, 0);
 transform: translate3d(-400%, 0, 0);
 }
}

@keyframes slideLeftHide{
 @include slide-left-hide;
}

@-webkit-keyframes slideLeftHide{
 @include slide-left-hide;
}

@mixin popup-hide{
 0%{
 z-index: 99999;
 opacity: 1;
 }
 100%{
 z-index: -1;
 opacity: 0;
 }
}

@keyframes popupHide{
 @include popup-hide;
}

@-webkit-keyframes popupHide{
 @include popup-hide;
}

.popup{
 position: fixed;
 top: 0;
 left: 0;
 width: 100%;
 height: 100%;
 z-index: -1;
 opacity: 0;
 .popup-bg{
 position: absolute;
 top: 0;
 left: 0;
 background: rgba(0,0,0, 0.5);
 width: 100%;
 height: 100%;
 z-index: 1;
 }
 .popup-wrapper{
 position: relative;
 width: 70%;
 height: 70%;
 margin: auto;
 background: #fff;
 border-radius: 5%;
 z-index: 100;
 }
 &.hidden{
 display: none;
 }
 &.show{
 z-index: 99999;
 opacity: 1;
 &.top{
  .popup-wrapper{
  -webkit-animation: slideTop 0.6s linear forwards;
  -moz-animation: slideTop 0.6s linear forwards;
  -ms-animation: slideTop 0.6s linear forwards;
  -o-animation: slideTop 0.6s linear forwards;
  animation: slideTop 0.6s linear forwards;
  }
 }
 &.right{
  .popup-wrapper{
  -webkit-animation: slideRight 0.6s linear forwards;
  -moz-animation: slideRight 0.6s linear forwards;
  -ms-animation: slideRight 0.6s linear forwards;
  -o-animation: slideRight 0.6s linear forwards;
  animation: slideRight 0.6s linear forwards;
  }
 }
 &.bottom{
  .popup-wrapper{
  -webkit-animation: slideBottom 0.6s linear forwards;
  -moz-animation: slideBottom 0.6s linear forwards;
  -ms-animation: slideBottom 0.6s linear forwards;
  -o-animation: slideBottom 0.6s linear forwards;
  animation: slideBottom 0.6s linear forwards;
  }
 }
 &.left{
  .popup-wrapper{
  -webkit-animation: slideLeft 0.6s linear forwards;
  -moz-animation: slideLeft 0.6s linear forwards;
  -ms-animation: slideLeft 0.6s linear forwards;
  -o-animation: slideLeft 0.6s linear forwards;
  animation: slideLeft 0.6s linear forwards;
  }
 }
 }
 &.hide{
 -webkit-animation: popupHide 0.7s linear forwards;
 -moz-animation: popupHide 0.7s linear forwards;
 -ms-animation: popupHide 0.7s linear forwards;
 -o-animation: popupHide 0.7s linear forwards;
 animation: popupHide 0.7s linear forwards;
 &.top{
  .popup-wrapper{
  -webkit-animation: slideTopHide 0.6s linear forwards;
  -moz-animation: slideTopHide 0.6s linear forwards;
  -ms-animation: slideTopHide 0.6s linear forwards;
  -o-animation: slideTopHide 0.6s linear forwards;
  animation: slideTopHide 0.6s linear forwards;
  }
 }
 &.right{
  .popup-wrapper{
  -webkit-animation: slideRightHide 0.6s linear forwards;
  -moz-animation: slideRightHide 0.6s linear forwards;
  -ms-animation: slideRightHide 0.6s linear forwards;
  -o-animation: slideRightHide 0.6s linear forwards;
  animation: slideRightHide 0.6s linear forwards;
  }
 }
 &.bottom{
  .popup-wrapper{
  -webkit-animation: slideBottomHide 0.6s linear forwards;
  -moz-animation: slideBottomHide 0.6s linear forwards;
  -ms-animation: slideBottomHide 0.6s linear forwards;
  -o-animation: slideBottomHide 0.6s linear forwards;
  animation: slideBottomHide 0.6s linear forwards;
  }
 }
 &.left{
  .popup-wrapper{
  -webkit-animation: slideLeftHide 0.6s linear forwards;
  -moz-animation: slideLeftHide 0.6s linear forwards;
  -ms-animation: slideLeftHide 0.6s linear forwards;
  -o-animation: slideLeftHide 0.6s linear forwards;
  animation: slideLeftHide 0.6s linear forwards;
  }
 }
 }

}

html,
body,
.main{
 width: 100%;
 height: 100%;
 overflow: hidden;
}

.head,
.body,
.foot{
 width: 100%;
}

.head,
.foot{
 height: 15%;
}

.body{
 height: 70%;
}

.gray-theme{
 background: #333;
 color: #fff;
}

.btn-list{
 width: 40%;
 min-width: 270px;
 height: 38px;
 .btn-box{
 width: 22%;
 height: 100%;
 padding-right: 4%;
 &:last-child{
  padding-right: 0;
 }
 }
}

.btn{
 line-height: 1em;
 width: 100%;
 height: 100%;
 border-radius: 10%;
 font-size: 16px;
 background: green;
 color: #ff0;
 text-align: center;
 vertical-align: middle;
 cursor: pointer;
}

    js代码：

    class PopupComponent {
 constructor() {
  this.btnGroupEl = document.getElementsByClassName("btn-group")[0];
  this.popupEl = document.getElementsByClassName("popup")[0];
  this.popupBGEl = this.popupEl.querySelector(".popup-bg");
  this.popupTitleEl = this.popupEl.querySelector(".popup-wrapper .title");
  this.popupBodyEl = this.popupEl.querySelector(".popup-wrapper .body");
  this.cancelBtnEl = this.popupEl.querySelector(".popup-wrapper .btn.cancel");
  this.confirmBtnEl = this.popupEl.querySelector(".popup-wrapper .btn.confirm");
  this.popupElClasslist = this.popupEl.classList;
  this.LEGVALS = ["top", "right", "bottom", "left"];
  this.detaultPosition = "";
  this.position = "";
  this.SHOWCLASSNAME = "show";
  this.HIDECLASSNAME = "hide";
  this.HIDDENCLASSNAME = "hidden";
 }

 /**
  * 给弹窗的标题和主体添加内容
  * @param Object contentObj 传递的对象
  */
 setContentForPopup(contentObj = {'title':'title', 'body': 'body'}) {
  try{
  if (!TB.isObject(contentObj)) {
   throw new Error("The param of setContentForPopup function error!");
  }
  let value;
  for (let prop in contentObj) {
   if (!contentObj.hasOwnProperty(prop)) {
   continue;
   }

   if (prop === 'title') {
   value = contentObj[prop];
   this.popupTitleEl.innerText = value;
   }

   if (prop === 'body') {
   value = contentObj[prop];
   this.popupBodyEl.innerText = value;
   }
  }
  } catch (e) {
  console.log("Popup element is not exist!");
  console.error(e);
  }
 }

 /**
  * 删除弹窗的类名
  * @return void
  */
 deletePopupPreviousClassName() {
  if (this.HIDDENCLASSNAME && KB.checkType.isString(this.HIDDENCLASSNAME)) {
  this.popupElClasslist.remove(this.HIDDENCLASSNAME);
  }

  if (this.detaultPosition && KB.checkType.isString(this.detaultPosition)) {
  this.popupElClasslist.remove(this.detaultPosition);
  }

  this.detaultPosition = this.position;
 }

 /**
  * 弹窗隐藏
  * @return void
  */
 popupHide() {
  if (this.popupElClasslist.contains(this.SHOWCLASSNAME)) {
  this.popupElClasslist.remove(this.SHOWCLASSNAME);
  this.popupElClasslist.add(this.HIDECLASSNAME);
  }
 }

 /**
  * 弹窗显示
  * @return void
  */
 popupShow() {
  this.deletePopupPreviousClassName();  
  if (this.popupElClasslist.contains(this.HIDECLASSNAME)) {
  this.popupElClasslist.remove(this.HIDECLASSNAME);
  this.popupElClasslist.add(this.SHOWCLASSNAME);
  this.popupElClasslist.add(this.position);
  }

  this.setContentForPopup({
  'title': this.position + ' title',
  'body': this.position + ' body',
  });
 }

 /**
  * 按钮容器的点击事件
  * @param Object e 点击的事件event
  * @return void
  */
 btnGroupClickEvent(e) {
  let btnEl = e.target || e.srcElement;
  if (!TB.isElement(btnEl)) {
  throw new Error("Get btn element error!");
  }
  this.position = btnEl.getAttribute("data-position");
  if (!TB.isString(this.position) || (this.LEGVALS.indexOf(this.position) < 0)) {
  throw new Error("Can not get position value from btn element!");
  }
  this.popupShow();

 }

 /**
  * 给DOM元素添加点击事件
  * @param Object elem 添加点击事件的dom元素 
  * @param Function fn  触发事件调用的回调函数
  */
 addClickEventFormElem(elem, fn) {
  TB.addHandler.call(this, elem, 'click', fn, false);
 }

 /**
  * 初始化函数
  * @return void
  */
 init() {
  this.addClickEventFormElem(this.btnGroupEl, this.btnGroupClickEvent);
  this.addClickEventFormElem(this.cancelBtnEl, this.popupHide);
  this.addClickEventFormElem(this.confirmBtnEl, this.popupHide);
 }
 }

 let popupComponent = new PopupComponent();
 popupComponent.init();

    TB.addHandler：

    /*
* 给DOM元素添加事件
* @param void
* @return callback function 回调函数
* */
function addHandler(elem, type, callback, useCapture) {
 var checkType = checkArgumentType(),
 _document = document,
 _callback = checkType.isFunction(callback)? callback:function(){},
 _self = this;

 if (!checkType.isElement(elem) || !checkType.isString(type)) {
 return;
 }

 if (_document.addEventListener) {
 addHandler = function(elem, type, callback, useCapture) {
  elem.addEventListener(type, function(e) {
  _callback.call(_self, e);
  }, useCapture || false); 
 }
 } else if (_document.attachEvent) {
 addHandler = function(elem, type, callback, useCapture) {
  elem.attachEvent("on" + type, function(e){
  _callback.apply(_self, [e]);
  }); 
 }
 } else {
 addHandler = function(elem, type, callback, useCapture) {
  elem["on" + type] = function(e) {
  _callback.call(_self, e);
  };
 }
 }
 addHandler(elem, type, callback, useCapture);
}

    首先说一下弹窗的DOM结构：
    在外层一般是绝对定位，并使用flex布局使得内容居中；它的直接子元素一般有两个，黑色背景层和内容容器；如图所示：

    样式的动画相信前端的同学一般都知道怎么做；但是有一点要注意，不要试图使用display来实现动画；
    我使用的解决的办法是首先

    动画的显示隐藏使用的z-index和opacity；但是这样存在开始时，弹窗会缓缓隐藏，那么我们可以用一个类表示display: none;点击显示弹层时，移除该类即可；

    对于js没什么好说的，无非是操作类名；但是有一点要注意事件注册和this的指向;
    注意我的addHandler函数，该函数只会判断一次浏览器的环境，不需要反复的判断浏览器的环境；
    在btnGroupClickEvent函数中this是指向PopupComponent类，而不是事件的event;所以addHandler函数中首先保存this的指向，然后使用call或者apply改变this的指向

    以上就是【javascript实现弹出层效果】的全部内容了,欢迎留言评论进行交流!

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