事件封装函数

<script type="text/javascript">
//跨浏览器的事件处理函数：
var EventUtil = {
addHandler: function(element, type, handler) {
if (element.addEventListener) { // DOM2
element.addEventListener(type, handler, false);
} else if (element.attachEvent) { // IE
element.attachEvent('on' + type, handler);
} else { // DOM0
element['on' + type] = handler;
}
},

removeHandler: function(element, type, handler) {
if (element.removeEventListener) {
element.removeEventListener(type, handler, false);
} else if (element.detachEvent) {
element.detachEvent('on' + type, handler);
} else {
element['on' + type] = null;
}
}
};
//跨浏览器的事件对象：
var EventUtil = {
getEvent: function(e) {
return e ? e : window.e;
},

getTarget: function(e) {
return e.target || e.srcElement;
},

preventDefault: function(e) {
if (e.preventDefault) {
e.preventDefault();
} else {
e.returnValue = false;
}
},

stopPropagation: function(e) {
if (e.stopPropagation) {
e.stopPropagation()
} else {
e.cancelBubble = true;
}
}
}
</script>