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鼠标滚轮编程

时间：2021-07-01 10:21:17 帮助过：31人阅读

以前没有注意到这个滚轮，看到这里有一篇说这个的：http://www.javascriptsearch.com/guides/Advanced/articles/JSMouseScrolling.html

我把它转过来了。如果是在实际应用中，有的时候还是蛮有用的。主要是得到滚轮是向上滚还是向下滚。

注释的代码

function handle(delta) {
if (delta < 0)
…;
else
…;
}

/** 事件句柄
*/
function wheel(event){
var delta = 0;
if (!event) /* For IE. */
event = window.event;
if (event.wheelDelta) { /* IE或者Opera. */
delta = event.wheelDelta/120;
/** 在Opera9中，事件处理不同于IE
*/
if (window.opera)
delta = -delta;
} else if (event.detail) { /** 兼容Mozilla. */
/** In Mozilla, sign of delta is different than in IE.
* Also, delta is multiple of 3.
*/
delta = -event.detail/3;
}
/** 如果增量不等于0则触发
* 主要功能为测试滚轮向上滚或者是向下
*/
if (delta)
handle(delta);
}

/** 初始化 */
if (window.addEventListener)
/** Mozilla的基于DOM的滚轮事件 **/
window.addEventListener('DOMMouseScroll', wheel, false);
/** IE/Opera. */
window.onmousewheel = document.onmousewheel = wheel;
在上面的代码中,handler函数里的代码就是你要写的，它有一个参数-delta，事实上，它只是代码鼠标此刻是向上滚或者是向下滚。如下所示，
uploads/200608/02_013450_deltas.gif

<?xml version="1.0" encoding="UTF-8"?>  
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/tr/html4/strict.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml"> 
<head> 
  <title> mousewheel delta  - http://www.never-online.net </title> 
  <meta http-equiv="ImageToolbar" content="no" /> 
  <meta name="author" content="never-online, BlueDestiny"/> 
  <meta name="keywords" content="never modules, Mozilla CSS, C#, .net, Refercence, BlueDestiny, never-online"/> 
  <meta name="description" content="BlueDestiny, never-online"/> 
  <meta name="title" content=" - http://www.never-online.net" /> 
  <meta name="creator.name" content="never-online, BlueDestiny" /> 
  <style type="text/css" media="all" title="Default">

</style> 
  <script type="text/javascript"> 
  //<![CDATA[ 
function handle(delta) { 
    var s = delta + ": "; 
    if (delta < 0) 
        s += "down"; 
    else 
        s += "up"; 
    document.getElementById('delta').innerHTML = s; 
}

/* Initialization code. */ 
if (window.addEventListener) 
    window.addEventListener('DOMMouseScroll', wheel, false); 
window.onmousewheel = document.onmousewheel = wheel;

//]]> 
  </script> 
  <body id="www.never-online.net"> 
Scroll mouse wheel to see delta here. 
  </body> 
</html>

[Ctrl+A 全选注:如需引入外部Js需刷新才能执行]

鼠标滚轮编程

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