jQuery1.6.1 发布有一段时间了，发现一些冗余代码，列出如下
1，bind 方法，最后一个参数fn是多余的
view sourceprint 1 // Handle object literals
2 if ( typeof type === "object" ) {
3 for ( var key in type ) {
4 this[ name ](key, data, type[key], fn);
5 }
6 return this;
7 }
2，注释
view sourceprint 1 // Add which for click: 1 === left; 2 === middle; 3 === right
应修改为
view sourceprint 1 // Add which for mousedown/mouseup : 1 === left; 2 === middle; 3 === right
3，data方法，定义了局部变量internalKey，但后续代码仍然沿用jQuery.expando。
view sourceprint 1 var internalKey = jQuery.expando, getByName = typeof name === "string", thisCache,
4，jQuery.event.add方法，arguments改为e，apply改为call 更好一些。因为只会传一个参数：事件对象。
view sourceprint 1 elemData.handle = eventHandle = function( e ) {
2 // Discard the second event of a jQuery.event.trigger() and
3 // when an event is called after a page has unloaded
4 return typeof jQuery !== "undefined" && (!e || jQuery.event.triggered !== e.type)
5 jQuery.event.handle.apply( eventHandle.elem, arguments ) :
6 undefined;
7
8 };
5，基于 “勿重复检测浏览器” 原则，jQuery.event.add 以下代码
view sourceprint 1 if ( elem.addEventListener ) {
2 elem.addEventListener( type, eventHandle, false );
3
4 } else if ( elem.attachEvent ) {
5 elem.attachEvent( "on" + type, eventHandle );
6 }
应该使用以下来替换
view sourceprint 01 jQuery.addEvent = document.addEventListener
02 function( elem, type, handle ) {
03 if ( elem.addEventListener ) {
04 elem.addEventListener( type, handle, false );
05 }
06 } :
07 function( elem, type, handle ) {
08 if ( elem.attactEvent ) {
09 elem.attactEvent( "on" + type, handle );
10 }
11 };
事实上，jQuery中已经有了jQuery.removeEvent，却不知为何没有jQuery.addEvent。
持续更新...