js滾輪事件

目前不同瀏覽器的滾輪事件如下：

事件瀏覽器

wheel	Chrome(31+), FF(17+), IE(9+)
mousewheel	Chrome, IE(6+), Opera, Safari
MozMousePixelScroll	FF(3.5 only!) (2010-2013)
DOMMouseScroll	FF(0.9.7+) since 2003

因此通用的滾輪事件有3個：wheel/mousewheel/DOMMouseScroll
為此可以封裝一個獲取滾輪事件的方法：

function getMouseEvent(event) {return "onwheel" in document.createElement("div") ? "wheel" :document.onmousewheel !== undefined ? "mousewheel" : "DOMMouseScroll"; }

以下是不同瀏覽器對應的滾輪事件屬性：

–event.wheelDeltaevent.detai

Safari v5/OS X	-120	0
Safari v5/Win7	-120	0
Chrome v17/OS X	-120	0
Chrome v17/Win7	-120	0
IE9/Win7	-120	undefined
Firefox v4/OS X	undefined	1
Firefox v4/Win7	undefined	3

通用滾輪事件封裝：

var PIXEL_STEP = 10; var LINE_HEIGHT = 40; var PAGE_HEIGHT = 800; function normalizeWheel(event) {var sX = 0, sY = 0, pX = 0, pY = 0; if ('detail' in event) { sY = event.detail; }if ('wheelDelta' in event) { sY = -event.wheelDelta / 120; }if ('wheelDeltaY' in event) { sY = -event.wheelDeltaY / 120; }if ('wheelDeltaX' in event) { sX = -event.wheelDeltaX / 120; }if ( 'axis' in event && event.axis === event.HORIZONTAL_AXIS ) {sX = sY;sY = 0;}pX = sX * PIXEL_STEP;pY = sY * PIXEL_STEP;if ('deltaY' in event) { pY = event.deltaY; }if ('deltaX' in event) { pX = event.deltaX; }if ((pX || pY) && event.deltaMode) {if (event.deltaMode == 1) { // delta in LINE unitspX *= LINE_HEIGHT;pY *= LINE_HEIGHT;} else { // delta in PAGE unitspX *= PAGE_HEIGHT;pY *= PAGE_HEIGHT;}}if (pX && !sX) { sX = (pX < 1) ? -1 : 1; }if (pY && !sY) { sY = (pY < 1) ? -1 : 1; }return { spinX : sX,spinY : sY,pixelX : pX,pixelY : pY }; }

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