<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
</head>
<body>
<div id="panel"><h5 class="head">什么是jquery?</h5><div class="content" style="display:none">是一個JS庫沒什么好看的...</div>
</div>
<script src="https://cdn.bootcss.com/jquery/3.4.1/jquery.js"></script>
<script>
$('#panel h5.head').bind('click',function(){if($(this).next().is(':visible')){$(this).next().hide();}else{$(this).next().show()}
})</script>
</body>
</html>
參考《鋒利的jQuery》 P102~P103
說明)
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實現萬年歷)
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