prop = this.props[ –i ];
event[ prop ] = originalEvent[ prop ];
}
//将目标元素同一成event.target
if ( !event.target )
event.target = event.srcElement || document; // Fixes #1925 where srcElement might not be defined either
//如果发现是文本节点 取他的父节点
if ( event.target.nodeType == 3 )
event.target = event.target.parentNode;
if ( !event.relatedTarget && event.fromElement )
event.relatedTarget = event.fromElement == event.target ? event.toElement : event.fromElement;
return event;
}
}
win.setEvent = function(src){
// Allow instantiation without the ‘new’ keyword
// Event object
if( src && src.type ){
this.originalEvent = src;
this.type = src.type;
// Event type
}else
this.type = src;
// timeStamp is buggy for some events on Firefox(#3843)
// So we won’t rely on the native value
this.timeStamp = now();
// Mark it as fixed
this[expando] = true;
}
function returnFalse(){
return false;
}
function returnTrue(){
return true;
}
setEvent.prototype = {
preventDefault: function() {
var e = this.originalEvent;
if( !e )
return;
// if preventDefault exists run it on the original event
if (e.preventDefault)
e.preventDefault();
// otherwise set the returnValue property of the original event to false (IE)
e.returnValue = false;
},
stopPropagation: function() {
var e = this.originalEvent;
if( !e )
return;
// if stopPropagation exists run it on the original event
if (e.stopPropagation)
e.stopPropagation();
// otherwise set the cancelBubble property of the original event to true (IE)
e.cancelBubble = true;
},
stopImmediatePropagation:function(){
this.isImmediatePropagationStopped = returnTrue;
this.stopPropagation();
},
isImmediatePropagationStopped: returnFalse
};
一个完整的例子
<!DOCTYPE html PUBLIC “-//W3C//DTD XHTML 1.0 Transitional//EN” “http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd”>
<html xmlns=”http://www.w3.org/1999/xhtml”>
<head>
<meta http-equiv=”Content-Type” content=”text/html; charset=gb2312″ />
<title></title>
</head>
<body>
<div id=”vv” style=”height:200px;width:200px; background-color:#f00; padding:20px;”>
<div id=”xx” style=”height:200px;width:200px; background-color:#000000;”></div>
</div>
<script type=”text/javascript”>
(function(doc,undefined){
function now(){
return +new Date;
};
var win = this,
expando = “jQuery” + now(),
uuid = 0,
cache = {};
win.data = function(elem, name, data){
var id = elem[expando];
if(!id)
id = elem[expando] = ++uuid;
if(name&&!cache[id])
