【实用随记】获取鼠标滚轮上下滚

function handle(delta) {
        var s = delta + ": ";
        if (delta <0)
            s += "down...";
        else
            s += "up...";
        document.getElementById('delta').innerHTML = s;
    }

    function wheel(event){
        var delta = 0;
         event = event || window.event;
        if (event.wheelDelta) {
            delta = event.wheelDelta/120;
            //if (window.opera) delta = -delta; 对opera的兼容
        } else if (event.detail) {
            delta = -event.detail/3;
        }
        if (delta)
            handle(delta);
    }

    if (window.addEventListener)
    window.addEventListener('DOMMouseScroll', wheel, false);
    window.onmousewheel = document.onmousewheel = wheel;

<div id="delta"></div>

最后

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