1.首先写一个遮罩层div，然后再写一个弹窗的div
<!-- 遮罩层 --><div id="cover" style="background: #000; position: absolute; left: 0px; top: 0px; width: 100%; ?filter: alpha(opacity=30); opacity: 0.3; display: none; z-index: 2 "> ???</div><!-- 弹窗 --><div id="showdiv" style="width: 80%; margin: 0 auto; height: 9.5rem; border: 1px solid #999; display: none; position: absolute; top: 40%; left: 10%; z-index: 3; background: #fff"> ???<!-- 标题 --> ???<div style="background: #F8F7F7; width: 100%; height: 2rem; font-size: 0.65rem; line-height: 2rem; border: 1px solid #999; text-align: center;" > ???????提示 ???</div> ???<!-- 内容 --> ???<div style="text-indent: 50px; height: 4rem; font-size: 0.5rem; padding: 0.5rem; line-height: 1rem; "> ???????js弹窗 js弹出DIV,并使整个页面背景变暗</div> ???<!-- 按钮 --> ???<div style="background: #418BCA; width: 80%; margin: 0 auto; height: 1.5rem; line-height: 1.5rem; text-align: center;color: #fff;margin-top: 1rem; -moz-border-radius: .128rem; -webkit-border-radius: .128rem; border-radius: .128rem;font-size: .59733rem;" onclick="closeWindow()"> ???????确 定 ???</div></div>
js代码：（把jq引进来）
<script type="text/javascript"> ???// 弹窗 ???function showWindow() { ???????$(‘#showdiv‘).show(); ??//显示弹窗 ???????$(‘#cover‘).css(‘display‘,‘block‘); //显示遮罩层 ???????$(‘#cover‘).css(‘height‘,document.body.clientHeight+‘px‘); ?//设置遮罩层的高度为当前页面高度 ???} ???// 关闭弹窗 ???function closeWindow() { ???????$(‘#showdiv‘).hide(); ??//隐藏弹窗 ???????$(‘#cover‘).css(‘display‘,‘none‘); ????//显示遮罩层 ???}</script>效果：
js弹窗 js弹出DIV,并使整个页面背景变暗
原文地址：https://www.cnblogs.com/zxf100/p/8900787.html