EventUtil对象
var EventUtil = {
addHandler : function(element,type,handler){
if(element.addEventListener){
element.addEventListener(type,handler,false)
}else if(element.attachEvent){
element.attachEvent("on"+type,handler)
}else{
element["on"+type] = handler;
}
},
getEvent : function(event){
return event ? event:window.event;
},
getTarget : function(event){
return event.target || event.srcElement;
},
prevemtDefault : function(event){
if(event.preventDefault){
event.preventDefault()
}else{
event.returnValue = false;
}
},
removeHandler:function(element,type,handler){
if(element.addEventListener){
element.removeEventListener(type,handler,false)
}else if(element.attachEvent){
element.detachEvent("on"+type,handler)
}else{
element["on"+type] = null;
}
},
stopPropagation : function(event){
if(event.stopPropagation){
event.stopPropagation();
}else{
event.cancelBubble = true;
}
},
getCharCode : function(){
if(typeof event.charCode == "number"){
return event.charCode;
}else{
return event.keyCode;
}
}
}
EventUtil.addHandler(btn,"click",function(event){
event = EventUtil.getEvent(event);
alert("client coordinates:" + event.clientX+","+event.clientY)
});
EventUtil.addHandler(document,"mousewheel",function(event){
event = EventUtil.getEvent(event);
console.log("client coordinates:" + event.wheelDelta)
});
EventUtil.addHandler(myDiv,"contextmenu",function(event){
event = EventUtil.getEvent(event);
EventUtil.preventDefault(event);
var menu = document.getElementById("myMenu");
menu.style.left=event.clientX+"px";
menu.style.top=event.clientY+"px";
menu.style.visibility = "visible";
});
EventUtil.addHandler(document,"click",function(event){
document.getElementById("myMenu").style.visibility = "hidden"
});