js 监听鼠标滚动（备忘）

//鼠标滚轮监听 
		var scrollFunc = function(e) {
			e = e || window.event;
			if(e.wheelDelta) { //IE/Opera/Chrome 
				$("#menuScroll").scrollTop(-e.wheelDelta/2) ;
			} else if(e.detail) { //Firefox 
				$("#menuScroll").scrollTop(-e.wheelDelta/2);	
			}
		}
		/*注册事件*/
		if(document.addEventListener) {
			document.addEventListener('DOMMouseScroll', scrollFunc, false);
		} //W3C 
		window.onmousewheel = document.onmousewheel = scrollFunc; //IE/Opera/Chrome