事件型別
事件物件
是否標準化
相容性mousewheel
mousewheelevent
非標準化
只有firefox不支援
dommousescroll
mousescrollevent
非標準化
只有firefox支援
wheel
wheelevent
dom level 3
firefox 17+/ie9+
wheel事件詳細內容：wheel事件
瀏覽器型別
evt.wheeldelta
evt.detail
safari v5/win7
1200
safari v5/os x
1200
safari v7/os x120
chrome v11/win7
1200
chrome v37/win7
1200
chrome v11/os x
3(!)
0(possibly wrong)
chrome v37/os x
1200
ie9/win7
120undefined
opera v11/os x
40-1
opera v24/os x
1200
opera v11/win7
120-3
firefox v4/win7
undefined
-3firefox v4/os x
undefined
-1firefox v30/os x
undefined
-1
'use strict';
var useragent_deprecated = require('useragent_deprecated');
var iseventsupported = require('iseventsupported');
// reasonable defaults
var pixel_step = 10;
var line_height = 40;
var page_height = 800;
function normalizewheel(event)
if ('wheeldelta' in event)
if ('wheeldeltay' in event)
if ('wheeldeltax' in event)
// side scrolling on ff with dommousescroll
if ( 'axis' in event && event.axis === event.horizontal_axis )
px = sx * pixel_step;
py = sy * pixel_step;
if ('deltay' in event)
if ('deltax' in event)
if ((px || py) && event.deltamode) else
} // fall-back if spin cannot be determined
if (px && !sx)
if (py && !sy)
return ;
}/*spinx + spiny標準化的最佳組合。 它支援舊的dommousescroll for firefox，因為ff不包含帶有'wheel'事件的wheeldelta，因此無法確定旋轉速度。*/
normalizewheel.geteventtype = function() /*string*/ ;
module.exports = normalizewheel;
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