1，bind 方法，最后一個參數fn是多余的
// Handle object literals
if ( typeof type === "object" ) {
for ( var key in type ) {
this[ name ](key, data, type[key], fn);
}
return this;
}
2，注釋
// Add which for click: 1 === left; 2 === middle; 3 === right
應修改為
// Add which for mousedown/mouseup : 1 === left; 2 === middle; 3 === right
3，data方法，定義了局部變量internalKey，但后續代碼仍然沿用jQuery.expando。
var internalKey = jQuery.expando, getByName = typeof name === "string", thisCache,
4，jQuery.event.add方法，arguments改為e，apply改為call 更好一些。因為只會傳一個參數：事件對象。
elemData.handle = eventHandle = function( e ) {
// Discard the second event of a jQuery.event.trigger() and
// when an event is called after a page has unloaded
return typeof jQuery !== "undefined" && (!e || jQuery.event.triggered !== e.type) ?
jQuery.event.handle.apply( eventHandle.elem, arguments ) :
undefined;
};
5，基于 “勿重復檢測瀏覽器” 原則，jQuery.event.add 以下代碼
if ( elem.addEventListener ) {
elem.addEventListener( type, eventHandle, false );
} else if ( elem.attachEvent ) {
elem.attachEvent( "on" + type, eventHandle );
}
應該使用以下來替換
jQuery.addEvent = document.addEventListener ?
function( elem, type, handle ) {
if ( elem.addEventListener ) {
elem.addEventListener( type, handle, false );
}
} :
function( elem, type, handle ) {
if ( elem.attactEvent ) {
elem.attactEvent( "on" + type, handle );
}
};
事實上，jQuery中已經有了jQuery.removeEvent，卻不知為何沒有jQuery.addEvent。
