在线运行代码 - 菜鸟教程

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"> 
<title>菜鸟教程(cainiaoplay.com)</title>
<script src="https://cdn.staticfile.org/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
  $("body").on("click", "button", function(event){
    alert("delegateTarget 返回: " + event.delegateTarget.nodeName +
    "\ncurrentTarget 返回: " + event.currentTarget.nodeName);
  });
});
</script>
</head>
<body>

<button>在委托事件发生后显示 delegateTarget 和 currentTarget 的区别。</button>

</body>
</html>
源代码

动行结果
