event在IE和FF不兼容，今天传参碰到些问题，参考网上的一些方法，有所心得：
aClassArray[i].onmouseover = function () { //代码直接写在里面是可以的，要传参也可以传，只是不方便复用 };aClassArray[i].onmouseover =linkMouseover//不传参的情况下是可以用的，但后续不能用 arguments.callee.caller.arguments[0]aClassArray[i].onmouseover =linkMouseover()//加括号是错误用法aClassArray[i].onmouseover = function () { linkMouseover(this) };//this能传进去，可以alert出来，但evt.clientX + "px"就出问题了，是空的。。。 arguments.callee.caller.arguments[0]//可以用这个解决var src = evt.srcElement || evt.target; //后续还可以跟src===========================================================================
附上练习代码
<!DOCTYPE html><html><head><title></title><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><link rel="stylesheet" href="css/ui-lightness/jquery-ui-1.10.4.custom.css" rel="external nofollow" /><script src="js/jquery-1.10.2.js"></script><script src="js/jquery-ui-1.10.4.custom.js"></script><style type="text/css">.aClass, .aClass:visited {font-size: 36px;text-decoration: none;color: #0094ff;}.divTips {font-size: 20px;color: red;border: #f00 1px solid;position: absolute;width: 100px;height: 30px;}</style><script type="text/javascript">function initOnOver() {var titleTips = {"baidu": "百度网站提示","163": "163网站提示","google": "google网站提示"}var aTag = document.getElementsByTagName("a");var aClassArray = [];for (var i = 0; i < aTag.length; i++) {if (aTag[i].className == "aClass") {aClassArray[aClassArray.length] = aTag[i];}}for (var i = 0; i < aClassArray.length; i++) {var e;aClassArray[i].onmouseover = function () { linkMouseover() };aClassArray[i].onmouseout = linkMouseout;}}function linkMouseover() {var divTips = document.createElement("div");var evt = window.event || arguments.callee.caller.arguments[0]; // 获取event对象divTips.className = "divTips";divTips.style.left = evt.clientX + "px";//+px兼容FFdivTips.style.top = evt.clientY + "px";//+px兼容FFdivTips.innerHTML = "test";document.getElementById("divA").appendChild(divTips);}function linkMouseout() {var divTag = document.getElementsByTagName("div");for (var i = 0; i < divTag.length; i++) {if (divTag[i].className == "divTips") {document.getElementById("divA").removeChild(divTag[i]);}}}window.onload = initOnOver;</script></head><body><div id="divA"><a href="http://www.baidu.com" rel="external nofollow">百度</a><br /><br /><br /><a href="http://www.163.com" rel="external nofollow">网易</a><br /><br /><br /><a href="http://www.google.com" rel="external nofollow">Google</a></div></body></html>