<!DOCTYPE html>
<html>
<head>
<script src="https://libs.baidu.com/jquery/2.1.4/jquery.min.js"></script>
<script>
$(document).ready(function(){ $("p").on("click", function(){ $(this).css("background-color", "pink"); });
$("button").click(function(){ $("p").off("click"); });
});
</script>
</head>
<body>
<p>Click this paragraph to change its background color.</p>
<p>Click the button below and then click on this paragraph (the click event is removed).</p>
<button>Remove the click event handler</button>
</body>
</html>