很多种，大概归纳为9种。 (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