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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

            
              function wheelUp() {
    alert("wheelUp");
}
function wheelDown() {
    alert("wheelDown");
}
wheel(wheelUp, wheelDown);

// 滚轮响应事件
// 参数:type有两个属性值,分别为"up"(滚轮向上)和"down"(滚轮向下)
function wheel(upFn, downFn) {
	// IE6
	window.onmousewheel = getWheelDalta;
	// Firefox
	if(window.addEventListener) {
		window.addEventListener("DOMMouseScroll", getWheelDalta, false);
	}
	// 获得鼠标滚轮事件
	function getWheelDalta(event) {
		var event = event || window.event;
	    var delta = 0;
	    // delta的返回值为正时,表示向前滚动;delta的返回值为负时,表示向后滚动;
	    if (event.wheelDelta) {
	    	// IE中,鼠标滚轮信息存放在wheelDelta属性中;向前滚动时,wheelDelta的值是120的倍数;向后滚动时,wheelDelta的值是-120的倍数;
	        delta = event.wheelDelta/120; 
	        if (window.opera) delta = -delta;
	    } else if (event.detail) {
	    	// Firefox的鼠标滚轮信息存放在detail属性中;向前滚动,detail的值是-3的倍数;向后滚动,detail的值是3的倍数;
	        delta = -event.detail/3;
	    }
	    // 执行滚轮事件函数
	    if(delta > 0) {
	    	upFn();
	    }else {
	    	downFn();
	    }

		// 阻止默认行为,防止当页面本身就存在滚动条时出现的异常
		prevent(event);
		function prevent(evt){
			if(evt.preventDefault){
				evt.preventDefault();
			}else{
				evt.returnValue = false;
			}
		}
	}   
}
            
          
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