jQuery的事件模块严重依赖于其数据储存(jQuery.data)，你会发现我的代码中的dataManager对象对应它。
这里只提供bind和unbind方法。暂不包含
1， 事件命名空间(event namespace)
2， 事件代理(event delegation)
3， 特殊事件如dom ready
接口如下：
代码如下:
E.bind(el, 'click', fn);
E.bind(el, 'click', fn, data);
E.unbind(el, 'click', fn);
E.unbind(el, 'click');
E.unbind(el);
代码如下:
/**
* Event from jQuery
* 2011-06-20 snandy
*
* A number of helper functions used for managing events.
* Many of the ideas behind this code originated from jQuery library (1.6.2).
*
* example
*
* E.bind(el, 'click', fn);
*
* E.bind(el, 'click', fn, data);
*
* E.unbind(el, 'click', fn);
*
* E.unbind(el, 'click');
*
* E.unbind(el);
*
*/
E = function( window ) {
var uuid = 0,
globalCache = {},
doc = window.document,
w3c = !!doc.addEventListener,
expando = 'snandy' + (''+Math.random()).replace(//D/g, ''),
addListener = w3c ?
function(el, type, fn) { el.addEventListener(type, fn, false); } :
function(el, type, fn) { el.attachEvent('on' + type, fn); },
removeListener = w3c ?
function(el, type, fn) { el.removeEventListener(type, fn, false); } :
function(el, type, fn) { el.detachEvent('on' + type, fn); };
dispatch = w3c ?
function( el, type ){
try{
var evt = doc.createEvent('Event');
evt.initEvent( type, true, true );
el.dispatchEvent( evt );
}catch( e ){ alert( e ) };
} :
function( el, type ){
try{
el.fireEvent( 'on' + type );
}catch( e ){ alert( e ); }
},
dataManager = {
data : function ( elem, name, data ) {
var getByName = typeof name === "string",
thisCache,
isNode = elem.nodeType,
cache = isNode ? globalCache : elem,
id = isNode ? elem[ expando ] : elem[ expando ] && expando;
if(!id && isNode) {
elem[expando] = id = ++uuid;
}
if(!cache[id]){
cache[id] = {};
}
thisCache = cache[id];
if(data !== undefined) {
thisCache[name] = data;
}
return getByName ? thisCache[name] : thisCache;
},
removeData : function ( elem, name ) {
var id = elem[expando],
thisCache = globalCache[id];
if(!id || !thisCache){
return;
}
if(typeof name === 'string') {
delete thisCache[name];
}else{
delete globalCache[id];
}
}
};
function returnFalse() {
return false;
}
function returnTrue() {
return true;
}
function now() {
return (new Date).getTime();
}
function isEmptyObject( obj ){
for( var i in obj ){
return false;
}
return true;
}
function addEvent (elem, types, handler, data) {
if ( elem.nodeType === 3 || elem.nodeType === 8 ) {
return;
}
if ( handler === false ) {
handler = returnFalse;
} else if ( !handler ) {
return;
}
var elemData = dataManager.data( elem ),
