http://mootools.net/slickspeed/				测试主流Javascript框架selector方法在各浏览器上的速度。与DOM有关。
Firefox 3.0.1(SpiderMonkey)					test instances no.01-05(unit: ms)				avg.	mid.	rank	blocker method
MooTools 1.2			140	146	141	140	144		142.2	141	4th	:nth-child
JQuery 1.2.6			149	152	152	150	154		151.4	152	4th	a[href][lang][class]
Prototype 1.6.0.2			228	231	231	234	230		230.8	231	3rd	parent child
YUI 2.5.2 Selector beta			352	352	350	349	350		350.6	350	4th	parent child
Dojo 1.1.1			99	102	101	102	102		101.2	102	4th	:contains(selectors)
Opera 9.52(Presto "Futhark")
MooTools 1.2			68	60	56	60	60		60.8	60	2nd	:first-child
JQuery 1.2.6			60	52	64	48	72		59.2	60	2nd	a[href][lang][class]
Prototype 1.6.0.2			76	72	76	72	76		74.4	76	1st	:nth-child
YUI 2.5.2 Selector beta			261	281	253	273	258		265.2	261	1st	:nth-child
Dojo 1.1.1			20	12	16	12	20		16	16	1st	none
Safari 3.1.2(JavaScriptCore)
MooTools 1.2			40	40	40	40	36		39.2	40	1st	.class
JQuery 1.2.6			40	32	32	36	36		35.2	36	1st	:first-child
Prototype 1.6.0.2			100	100	100	116	100		103.2	100	2nd	:nth-child
YUI 2.5.2 Selector beta			271	275	275	275	271		273.4	275	2nd	:nth-child
Dojo 1.1.1			51	55	51	51	47		51	51	2nd	parent ~ child
Internet Explorer 7.0(JScript)
MooTools 1.2			416	418	425	424	428		422.2	424	5th	element1,element2
JQuery 1.2.6			286	290	295	295	299		293	295	5th	:nth-child
Prototype 1.6.0.2			1698	1736	1740	1768	1738		1736	1738	5th	parent ~ child
YUI 2.5.2 Selector beta			1072	1096	1103	1100	1119		1098	1100	5th	:nth-child
Dojo 1.1.1			507	495	502	495	511		502	502	5th	parent ~ child
Google Chrome 0.2.149.27(V8)
MooTools 1.2			94	107	124	114	106		109	107	3rd	:contains(selectors)
JQuery 1.2.6			67	69	78	78	74		73.2	74	3rd	a[href][lang][class]
Prototype 1.6.0.2			313	295	322	320	319		313.8	319	4th	:nth-child
YUI 2.5.2 Selector beta			302	298	289	286	285		292	289	3rd	:nth-child
Dojo 1.1.1			97	85	82	86	88		87.6	86	3rd	parent ~ child
附opera 9.27测试结果。
	140	120	128
	124	144	144
	269	269	258
	493	511	502
	48	56	52