Jquery's find usage

1: both the children and find methods are used to obtain the sub-elements of the element. Neither of them returns the text node, just like most jquery methods.
2: The children method obtains only child elements at the level of elements, namely, immediate children.
3: The find method obtains all lower-level elements, namely, descendants of these elements in the DOM tree.
4: The selector parameter of the children method is optional (optionally) and used to filter sub-elements. However, the selector method of the find method is required.
5: The find method can actually be implemented by using jquery (selector, context): in English, the selector context is implemented with. find () method; therefore, $ ('Li. item-II '). find ('lil') is equivalent to $ ('lil', 'Li. item-II ').

Detailed source reference: http://www.jb51.net/article/26195.htm