jquer $(‘div li‘) $(‘div,li‘) $(‘div＞li‘) $(‘div‘,‘li‘)

$(‘div’,‘li’) $(‘ Son ’,’ Father ‘), Father looking for son
That is, find the child node from the parent node , Namely li In the label Noodles all div label
$(‘div li’)
stay div All inside li, Include children 、 Grandson level ... In short, that is div All inside li, No matter how many relationships there are , All offspring .
$(‘div,li’)
all div and li Elements , There's no father son relationship
$(‘div>li’)
stay div All inside li, Include children 、 Grandson level is not included ...
The parent element is div Of li Elements . Progeny elements , Not a descendant element