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mouseenter事件只会触发一次，触发对象是注册对象或者注册对象的子元素
mouseover事件可以触发多次，触发对象是注册对象或者注册对象的子元素
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</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>
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原文地址：http://www.cnblogs.com/bibiafa/p/5865566.html
