jQuery选择器
(1)基本
#id 
element 
.class 
* 
selector1,selector2,selectorN 

(2)层次选择器：
ancestor descendant 
parent > child 
prev + next 
prev ~ siblings 

(3)基本过滤器选择器
:first 
:last 
:not 
:even 
:odd 
:eq 
:gt 
:lt 
:header 
:animated 

(4)内容过滤器选择器
:contains 
:empty 
:has 
:parent 

(5)可见性过滤器选择器
:hidden 
:visible 

(6)属性过滤器选择器
[attribute] 
[attribute=value] 
[attribute!=value] 
[attribute^=value] 
[attribute$=value] 
[attribute*=value] 
[attrSel1][attrSel2][attrSelN] 

(7)子元素过滤器选择器
:nth-child 
:first-child 
:last-child 
:only-child 

(8)表单选择器
:input 
:text 
:password 
:radio 
:checkbox 
:submit 
:image 
:reset 
:button 
:file 
:hidden 

(9)表单过滤器选择器
:enabled 
:disabled 
:checked 
:selected