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Firefox使用DOMMouseScroll，其他的浏览器使用mousewheel。滚动事件触发时Firefox使用detail属性捕捉滚轮信息，其他的浏览器使用wheelDelta。不知道为何在该问题上其他厂商和微软的如此一致。Firefox可以使用<code>addEventListener</code>方法绑定DomMouseScroll事件。
<pre class="brush:javascript">elem.addEventListener('DOMMouseScroll', func, false);</pre>
IE和其他的主流浏览器可以使用传统的事件绑定模型。但不要使用IE专有的<code>attachEvent</code>方法，其他主流浏览器并不识别微软的这个方法。下面先测试一下。
<div id="mouseWheel" style="height: 40px; background-color: #ffffcc; text-align: center; line-height: 40px; font-size: 14px; border: 1px solid #dcdcdc;">120</div><script type="text/javascript">// <![CDATA[
var mouseWheel = document.getElementById('mouseWheel'); if (mouseWheel.addEventListener) { mouseWheel.addEventListener('DOMMouseScroll', function(event) { event.target.innerHTML = event.detail; event.stopPropagation(); event.preventDefault(); }, false); } mouseWheel.onmousewheel = function(event) { event = event || window.event; mouseWheel.innerHTML = event.wheelDelta; event.returnValue = false; }
// ]]></script><pre class="brush: javascript; gutter: true"><script type="text/javascript">
// <![CDATA[
var mouseWheel = document.getElementById('mouseWheel');
if (mouseWheel.addEventListener) {
mouseWheel.addEventListener('DOMMouseScroll', function(event) {
event.target.innerHTML = event.detail;
event.stopPropagation();
event.preventDefault();
}, false);
}
mouseWheel.onmousewheel = function(event) {
event = event || window.event;
mouseWheel.innerHTML = event.wheelDelta;
event.returnValue = false;
}
// ]]>
</script></pre>
测试之后得到如下的结论。
<pre> Firefox
鼠标滚轮向上滚动是-3，向下滚动是3
<pre><code>IE
鼠标滚轮向上滚动是120，向下滚动是-120
Safari
鼠标滚轮向上滚动是360，向下滚动是-360
Opera
鼠标滚轮向上滚动是120，向下滚动是-120
Chrome
鼠标滚轮向上滚动是120，向下滚动是-120</pre>
</code></pre>
<p>有人在Safari下做了一些测试：”只是滚动一圈的话，值为+-0.1，如果滚动地稍微快点的话（多滚动几圈），这个值也会变大。 这是因为Mac OS下有鼠标滚轮加速功能。滚动一次，浏览器滚动1像素，滚动3次，浏览器却滚动30像素”。同时他也对Camino（基于Gecko的内核引擎）进行研究：“与Safari相似（+- 0.3 to +-Infinity），虽然使用了与firefox相同的内核引擎，但结果这个delta值却只在+-2.666666里浮动，无论滚动速度如何。”<br></content></p>
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