<html>
<head>
<script src="https://libs.baidu.com/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("div").on("click","button",function(event){
$(event.delegateTarget).css("background-color", "pink");
});
});
</script>
</head>
<body>
<div style="background-color:yellow">
<p>Click the button to change the background color of this div.</p>
<button>Click me!</button>
</div>
<div style="background-color:yellow">
<p>Click the button to change the background color of this div.</p>
<button>Click me!</button>
</div>
</body>
</html>