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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>无标题文档</title> </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> <script> var x = 0,y = 0; var div1 = document.getElementsByClassName("over")[0]; div1.addEventListener("mouseover",function(){ var span = this.getElementsByTagName("span")[0] span.innerText = (x +=1); span.style.cssText = "border:2px red solid;"; },false); var div2 = document.getElementsByClassName("enter")[0]; div2.addEventListener("mouseenter",function(){ var span = this.getElementsByTagName("span")[0] span.innerText = (y +=1); span.style.cssText = "border:2px red solid;"; },false); </script> </body> </html>
mouseenter和mouseover的区别是mouseenter事件只会触发一次，触发对象可以是作为父元素的本身也可以是子元素。但是mouseover事件可以被触发多次，触发对象是父元素或者子元素。
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原文地址：http://www.cnblogs.com/pmx-pmx/p/5207137.html
