当鼠标位于固定div上方时，滚动底层div的方法吗？

var fixedElement = document.getElementById(“fixed”);

function fixedScrolled(e) {    var evt = window.event || e;    var delta = evt.detail ? evt.detail * (-120) : evt.wheelDelta; //delta returns +120 when wheel is scrolled up, -120 when scrolled down    $("#content").scrollTop($("#content").scrollTop() - delta);}var mousewheelevt = (/Gecko//i.test(navigator.userAgent)) ? "DOMMouseScroll" : "mousewheel";if (fixedElement.attachEvent)    fixedElement.attachEvent("on" + mousewheelevt, fixedScrolled);else if (fixedElement.addEventListener)    fixedElement.addEventListener(mousewheelevt, fixedScrolled, false);