<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<script src="../js/jquery.js" type="text/javascript" charset="utf-8"></script>
<script type="text/javascript">
$(function() {
$('button').click(function() {
alert(123);
$(this).off('click');
})
})
</script>
</head>
<body>
<button type="button">按钮</button>
</body>
</html>
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