镶套iframe 鼠标滚动无效解决办法

背景：frameset 外面镶套一个页面

问题：IE鼠标滚动无效，chrome firfox 支持

解决：内页传递给父页进行滚动

代码：

    <script type="text/javascript">
        window.onload = function () {
            obj = window.parent.parent.document;
            if (obj != null && obj != undefined) {
                var a = ["DOMMouseScroll", "mousewheel"],
                   chrome = navigator.userAgent.search(/chrome/i),
                   delta = 0;

                        if (document.attachEvent) {
                    document.onmousewheel = onMouseWheel;
                } else if (chrome != -1) {
                    document.addEventListener(a[1], onMouseWheel, false);
                } else {
                    document.addEventListener(a[0], onMouseWheel, false);
                };
                //
                function onMouseWheel(e) {
                    var e = e || window.event;
                    if (e.type == "mousewheel") {
                        delta = e.wheelDelta / 12;
                    } else {
                        delta = e.detail / 3 * -10;
                    };

                    if (chrome != -1) {

                    } else {
                        obj.documentElement.scrollTop -= delta;

                        //阻止默认事件
                        if (e.preventDefault) {
                            e.preventDefault();
                        }
                        return false;
                    }
                }
            }
        };
  </script>

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