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<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1" />
<title> 页面名称 </title>
<style type="text/css">
#a {
position: relative;
background-color: #9ff;
width: 200px;
height: 30px;
}
#popup {
position: absolute;
left: 0;
top: 100%;
background-color: #f66;
width: 100%;
height: 300px;
display: none;
}
</style>
</head>
<body>
<div id="a">
按钮
<div id="popup"></div>
</div>
<script type="text/javascript">
document.getElementById("a").onclick = function () {
document.getElementById("popup").style.display = "block";
}
</script>
</body>
</html>