匿名関数をサポートする Javascript イベント リスナーをカプセル化します_JavaScript スキル

/*イベントのバインドとバインド解除*/
var handleHash = {};
var binding = (function() {
if (window.addEventListener) {
return function( el, type, fn, Capture) {
el.addEventListener(type, function(){
fn();
handleHash[type] = handleHash[type] || [];
handleHash [type].push(arguments.callee);
}, Capture);
};
} else if (window.attachEvent) {
return function(el, type, fn, Capture) {
el.attachEvent("on" type, function(){
fn();
handleHash[type] = handleHash[type] || [];
handleHash[type].push (arguments.callee);
});
};
}
})();
var unbind = (function(){
if (window.addEventListener) {
return function(el, type) {
if(handleHash[type]){
var i = 0, len = handleHash[type].length;
for (i; i el.removeEventListener(type, handleHash[type][i]);
}
};
};
} else if (window.attachEvent) {
return function(el, type) {
if(handleHash[type]){
var i = 0, len = handleHash[type].length;
for (i; i el.detachEvent("on" type, handleHash[type][i]);
}
};
};
}
})() ;

bind (obj,'click',function(){
アラート ('click');
});
unbind(obj,'click');