JQuery有几种选择器?
a、基本选择器:#id,class,element,*;
b、层次选择器:parent > child,prev + next ,prev ~ siblings
c、基本过滤器选择器::first,:last ,:not ,:even ,:odd ,:eq ,:gt ,:lt
d、表单选择器: :input ,:text ,:password ,:radio ,:checkbox ,:submit 等;
e、表单过滤器选择器::enabled ,:disabled ,:checked ,:selected