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<!DOCTYPE html>
<html lang="zh-Hant-TW">
<head>
<title>Learing Javascript</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1" />
<style type="text/css">
#circle{
width: 200px;
height: 200px;
background-color: blue;
border-radius: 50%;
}
</style>
</head>
<body>
<div id="circle"></div>
<script type="text/javascript">
document.getElementById("circle").onclick = function(){
document.getElementById("circle").style.display = "none";
}
</script>
</body>
</html>
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