【js监听鼠标滚轮】

功能

监听鼠标滚轮运动方向

代码

var mouseListener = function() {//监听鼠标滚轮向上或者向下运动
				var event = event || window.event;
				var delta = event.wheelDelta ? event.wheelDelta : (-event.detail) * 40;
				if (delta == 150) console.log('up');
				if (delta == -150) console.log('down');
				
			}
			//注册事件监听
			document.addEventListener('mousewheel', mouseListener);
			//FireFox支持一个名为DOMMouseScroll的类似事件，类比于mousewheel。
			document.addEventListener('DOMMouseScroll', mouseListener);

扩展函数

var mouseListener = function(fUp,fDown) {//监听鼠标滚轮向上或者向下运动
				var event = event || window.event;
				var delta = event.wheelDelta ? event.wheelDelta : (-event.detail) * 40;
				if (delta == 150){
					console.log('up');
					if(fUp instanceof Function) fUp();//触发鼠标滚轮向上运动的函数
				} 
				if (delta == -150){
					console.log('down');
					if(fDown instanceof Function) fDown();//触发鼠标滚轮向下运动的函数
				} 
				
			}
			//注册事件监听
			document.addEventListener('mousewheel', mouseListener);
			document.addEventListener('DOMMouseScroll', mouseListener);