下面这个弹出框，想实现如下效果：
1、点击弹出框右上角的叉时，弹出框关闭；
2、点击弹出框本身以外的地方时，弹出框关闭；
3、点击弹出框本身，弹出框不关闭（那个叉除外）；
Html：
<!DOCTYPE html>
<html lang="zh-cn">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta http-equiv="x-ua-compatible" content="ie=edge">
<link href="https://cdn.bootcss.com/bootstrap/4.0.0-alpha.2/css/bootstrap.min.css" rel="stylesheet">
<style>
#card1 {
width: 40rem;
position: absolute;
display: none;
right: 0;
left: auto;
top: 100%;
z-index: 1000;
float: left;
min-width: 160px;
padding: 5px 0;
margin: 2px 0 0;
font-size: 1rem;
color: #373a3c;
text-align: left;
list-style: none;
background-color: #fff;
-webkit-background-clip: padding-box;
background-clip: padding-box;
border: 1px solid rgba(0, 0, 0, .15);
border-radius: .25rem;
}
</style>
</head>
<body>
<p class="col-lg-6">
<p class="input-group">
<input type="text" class="form-control" aria-label="Text input with dropdown button">
<p class="input-group-btn">
<button id="button1" type="button" class="btn btn-secondary dropdown-toggle"
aria-haspopup="true" aria-expanded="false">
</button>
<p class="card dropdown-menu-right" id="card1">
<p class="card-header">
弹出框
<button type="button" class="close" aria-label="Close">
<span aria-hidden="true">×</span>
<span class="sr-only">Close</span>
</button>
</p>
<p class="card-block">
<h4 class="card-title">Special title treatment</h4>
<p class="card-text">With supporting text below as a natural lead-in to additional content.</p>
<a href="#" class="btn btn-primary">Go somewhere</a>
</p>
</p>
</p>
</p>
</p>
<script src="https://cdn.bootcss.com/jquery/2.2.1/jquery.min.js"></script>
<script src="https://cdn.bootcss.com/tether/1.1.1/js/tether.min.js"></script>
<script src="https://cdn.bootcss.com/bootstrap/4.0.0-alpha.2/js/bootstrap.min.js"></script>
</body>
</html>
Javascript:
<script>
$('#button1').click(function () {
var menu = $('#card1');
if (menu.is(":hidden")) {
menu.show();
} else {
menu.hide();
}
});
</script>
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
我的想法是，首先阻止弹出框点击事件的冒泡，然后再给document绑定关闭弹出框的事件。
这样点击弹出框内，由于阻止了事件冒泡就不会冒到document。而点击页面其余部分可关闭该弹框。
<script type="text/javascript">
$(function(){
})
</script>