mouseover事件与mouseenter事件的差异

mouseover事件与mouseenter事件的区别
<!doctype html>
<html lang="en">
 <head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="Generator" content="EditPlus®">
  <meta name="Author" content="">
  <meta name="Keywords" content="">
  <meta name="Description" content="">
  <title>mouseover事件与mouseenter事件的区别</title>
  <script type="text/javascript" src="js/jquery-1.11.1.js"></script>  
  <script type="text/javascript">  
		x=0;  
		y=0;  
		$(document).ready(function(){  
		  $("div.over").mouseover(function(){  
			$(".over span").text(x+=1);  
		  });  
		  $("div.enter").mouseenter(function(){  
			$(".enter span").text(y+=1);  
		  });  
		});  
  </script> 
 </head>
 <body>
	<p>不论鼠标指针穿过被选元素或其子元素,都会触发 mouseover 事件。</p>  
	<p>只有在鼠标指针穿过被选元素时,才会触发 mouseenter 事件。</p>  
	<div class="over" style="background-color:lightgray;padding:20px;width:40%;float:left">  
		<h2 style="background-color:white;">被触发的 Mouseover 事件:<span></span></h2>  
	</div>  
	<div class="enter" style="background-color:lightgray;padding:20px;width:40%;float:right">  
		<h2 style="background-color:white;">被触发的 Mouseenter 事件:<span></span></h2>  
	</div>  
 </body>
</html>