原生js创建模态框（摘自：东窗凝残月链接：https://www.cnblogs.com/dcncy/p/9076937.html）


<!DOCTYPE html>
<html>
<head>
 <meta charset="UTF-8">
 <title>Test</title>
 <style>
 #pageMask {
 visibility: hidden; //使pageMask元素不可见
 position: absolute; //定位pageMask元素
 left: 0px; //定位pageMask元素
 top: 0px; //定位pageMask元素
 width:100%;
 height:100%;
 text-align: center; //文本对其方式
 z-index: 1100; //指定一个元素的堆叠顺序
 ">#333;//设置背景色
 opacity: 0.6; //设置元素的透明度级别
 }
 #ModalBody{
 background: white; //设置背景
 width: 50% !important;
 height: 50% !important;
 position:absolute; //定位ModalBody元素
 left: 25%;
 top: 25%;
 z-index: 1101; //指定元素的堆叠顺序
 border: 1px solid; //边框1px的实线
 display: none; //不可见
 }
 #closeModalBtn{
 position: static; //静态定位的元素不会受到top,bottom,left,right影响
 margin-top: 5px; //设置closeModalBtn元素的上部边距
 margin-right: 1%; //右部边距
 float: right; //右侧移动
 font-size: 14px; //字体大小
 background: #ccc000;
 cursor: pointer; //设置光标形态，pointer光标呈现为指示链接的指针（一只手）
 }
 </style>
</head>
<body>
<div class="content">
 <h1>Test Modal</h1>
 <div id="pageMask"></div> <!--遮盖层-->
 <button class="showModalBtn" id="showModalBtn">Btn</button>
 <div> <!--主页面-->
 Page Content...
 </div>
</div>

<div id="ModalBody"> <!--模态框-->
 <button id="closeModalBtn" style="display: none;">Close</button>
 <div>Test Modal Body...</div>
</div>

<script>
 window.onload = function(){
 expandIframe();
 }
 function expandIframe(){
 var mask = document.getElementById("pageMask");
 var modal = document.getElementById("ModalBody");
 var closeBtn = document.getElementById("closeModalBtn");
 var btn = document.getElementById("showModalBtn"); btn.onclick = function(){ modal.style.display = (modal.style.display == "block")? "none" : "block"; closeBtn.style.display = (closeBtn.style.display == "block")? "none" : "block"; mask.style.visibility = (mask.style.visibility == "visible")? "hidden" : "visible"; } closeBtn.onclick = function(){ modal.style.display = (modal.style.display == "block")? "none" : "block"; closeBtn.style.display = (closeBtn.style.display == "block")? "none" : "block"; mask.style.visibility = (mask.style.visibility == "visible")? "hidden" : "visible"; } }</script></body></html>

原生js创建模态框（摘自：东窗凝残月 链接：https://www.cnblogs.com/dcncy/p/9076937.html）

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原生js创建模态框（摘自：东窗凝残月链接：https://www.cnblogs.com/dcncy/p/9076937.html）