JavaScript

超轻量级php框架startmvc

简单实现js鼠标跟随效果

更新时间:2020-05-26 17:54:01 作者:startmvc
本文实例为大家分享了js鼠标跟随效果展示的具体代码,供大家参考,具体内容如下<!DOCTY

本文实例为大家分享了js鼠标跟随效果展示的具体代码,供大家参考,具体内容如下


<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>Document</title>
 <style>
 body,div{
 margin:0;
 padding:0;

 }
 #box{
 position:relative;
 margin:20px auto;
 width:300px;
 height:300px;
 background:#008000;
 }
 #mark{
 position:absolute;
 top:0;
 left:0;
 width:100px;
 height:100px;
 background:red;
 }
 </style>
</head>
<body>
 <div id='box'>
 
 </div>
 <script>
 var box = document.getElementById('box');

 box.onmouseover = function(e){
 e = e || window.event;
 var mark = document.createElement('div');
 mark.id = "mark";
 this.appendChild(mark);
 mark.style.left = e.clientX - this.offsetLeft + 5 + "px";
 mark.style.top = e.clientY - this.offsetTop + 5 + "px";
 //阻止mark盒子的onmouseover事件的冒泡传播
 mark.onmouseover = function(e){
 e = e || window.event;
 e.stopPropagation ? e.stopPropagation():e.cancelBubble = true;
 }
 mark.onmouseout = function(e){
 e = e || window.event;
 e.stopPropagation ? e.stopPropagation():e.cancelBubble = true;
 }
 }
 //以下代码会出现一个问题,当鼠标移动过快的时候,鼠标会进入到mark这个盒子,会触发它的mouseover行为,由于事件的冒泡传播机制,导致box的mouseover会重新被触发,导致红色盒子一直在不断的创建
 box.onmousemove = function(e){
 e = e || window.event;
 var mark = document.getElementById('mark');
 if(mark){
 mark.style.left = e.clientX - this.offsetLeft + 5 + "px";
 mark.style.top = e.clientY - this.offsetTop + 5 + "px";
 }

 }
 //依然有问题:鼠标快速移动,首先会到mark上,此时浏览器在计算mark的位置,计算完成,mark到达指定的位置,此时鼠标又重新回到box上,触发了box的mouseover,也触发了mark的mouseout,也会传播到box的mouseout上,会把mark先删除,然后在创建
 box.onmouseout = function(e){
 e = e || window.event;
 var mark = document.getElementById('mark');
 if(mark){
 this.removeChild(mark);
 }

 }

 //上面代码也可以通过将over和out事件分别改为enter和leave 
 //onmouseenter和onmouseover都是鼠标滑上去的行为,但是onmouseenter浏览器默认阻止了它的冒泡传播(mark的onmouseenter行为触发,不会传播到box);而onmouseover是存在冒泡传播的,想要阻止的话需要手动阻止
 </script>
</body>
</html>

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持脚本之家。

js 鼠标跟随