ie有window.event 对象，而其他浏览器没有这个对象，下面就是一个兼容这个对象的写法。得到event以后，可以利用其有用的属性。
function getEvent() //同时兼容ie和ff的写法
{
if(document.all) return window.event;
func=getEvent.caller;
while(func!=null){
var arg0=func.arguments[0];
if(arg0)
{
if((arg0.constructor==Event || arg0.constructor ==MouseEvent) || (typeof(arg0)=="object" && arg0.preventDefault && arg0.stopPropagation))
{
return arg0;
}
}
func=func.caller;
}
return null;
}
Anyone with more than a passing interest in modern Javascript techniques is probably aware of the Prototype framework (http://prototype.conio.net) . Among other things, it includes the extremely neat $ (dollar) function:
function $() {
var elements = new Array();
for (var i = 0; i < arguments.length; i++) {
var element = arguments[i];
if (typeof element == 'string')
element = document.getElementById(element);
if (arguments.length == 1)
return element;
elements.push(element);
}
return elements;
}