js响应鼠标滚轮事件
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var up = $('up'), down = $('down'), log;
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[up, down].each(function(arrow) {
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arrow.setstyle('opacity', .1);
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});
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document.addevent('mousewheel', function(event) {
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event = new event(event);
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/* mousewheel up */
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if (event.wheel > 0) {
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up.setstyle('opacity', 1);
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down.setstyle('opacity', .1);
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log = 'up';
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}
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/* mousewheel down*/
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else if (event.wheel < 0) {
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up.setstyle('opacity', .1);
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down.setstyle('opacity', 1);
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log = 'down';
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}
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$('log').sethtml(log);
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var cls = function() {
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[up, down].each(function(arrow) {
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arrow.setstyle('opacity', .1);
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});
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}.delay(100);
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