// 重写鼠标滚轮事件

mxEvent.addMouseWheelListener = function (funct) {

}

// 添加初次载入事件

window.onload = function () {

    var element= document.getElementById('graph');

    addScrollListener(element, wheelHandle);

}

function addScrollListener(element, wheelHandle) {

    if (typeof element != 'object') return;

    if (typeof wheelHandle != 'function') return;

    // 监測浏览器

    if (typeof arguments.callee.browser == 'undefined') {

        var user = navigator.userAgent;

        var b = {};

        b.opera = user.indexOf("Opera") > -1 && typeof window.opera == "object";

        b.khtml = (user.indexOf("KHTML") > -1 || user.indexOf("AppleWebKit") > -1 || user.indexOf("Konqueror") > -1) && !b.opera;

        b.ie = user.indexOf("MSIE") > -1 && !b.opera;

        b.gecko = user.indexOf("Gecko") > -1 && !b.khtml;

        arguments.callee.browser = b;

    }

    if (element == window)

        element = document;

    if (arguments.callee.browser.ie)

        element.attachEvent('onmousewheel', wheelHandle);

    else

        element.addEventListener(arguments.callee.browser.gecko ?

'DOMMouseScroll' : 'mousewheel', wheelHandle, false);

}

function wheelHandle(e) {

    var upcheck;

    if (e.wheelDelta) {

        upcheck = e.wheelDelta > 0 ? 1 : 0;

    } else {

        upcheck = e.detail < 0 ? 1 : 0;

    }

    if (upcheck) {

        myGraph.zoomIn();

    }

    else {

        myGraph.zoomOut();

    }

    if (window.event) {

        e.returnValue = false;

        window.event.cancelBubble = true;

    } else {

        e.preventDefault();

        e.stopPropagation();

    }

}

PS:myGraph是一个全局变量，mxGraph的实例