js事件绑定--支持匿名函数解除绑定

var handlers = {},
bind = (function (){
if(window.addEventListener){
return function (el, type, callback, capture){
el.addEventListener(type, function (){
callback();
handlers[type] = handlers[type] || [];
handlers[type].push(arguments.callee);
}, !!capture);
}
}else if(window.attachEvent){
return function (el, type, callback){
el.attachEvent('on'+type, function (){
callback.call(el);
handlers[type] = handlers[type] || [];
handlers[type].push(arguments.callee);
});
}
}else{
return function (el, type, callback){
el.on+'type' = callback;
}
}
}(window)),
unbind = (function (){
if(window.addEventListener){
return function (el, type){
if(handlers[type]){
var i=0, len = handlers[type].length;
for (; i<len; i++) {
el.removeEventListener(type, handlers[type][i]);
};
}
}
}else if(window.attachEvent){
return function (el, type){
if(handlers[type]){
var i=0, len = handlers[type].length;
for(; i<len; i++){
el.detachEvent('on'+type, handlers[type][i]);
}
}
}
}else{
return function (el, type){
el.on+'type' = null;
}
}
}(window));