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<html>
<head>
<meta charset="utf-8">
<title></title>
<style type="text/css">
#a{
width: 300px;
height: 300px;
border: solid;
background-color: #00FFFF;
}
.b{
width: 100px;
height: 100px;
border: solid;
background-color: #A9A9A9;
}
</style>
<script src="js/jquery-3.3.1.js" type="text/javascript" charset="utf-8"></script>
<script type="text/javascript">
$(function(){
$("#a").click(function(){
$("#a").append($(".b").eq(0))
})
})
</script>
</head>
<body>
<div id="a">
a
</div>
<div id="b1" class="b">
b1
</div>
<div id="b1" class="b">
b2
</div>
</body>
</html>