Jquery selects columns in table

Jquery column Selector
Let's start with a classic:
$ ("Table TR"). Find ("TD: First" example .html (11 );
// Incorrect syntax: $ ("Table tr TD: First" pai.html (11 );
This is a bug!
Another more classic one:
$ ("Table TR"). Each (function (){
$ (This). Find ("TD: eq (1)" example .html (22 );
})
In two special cases:
$ ("Table tr TD: First-Child" pai.html ("first ");
$ ("Table tr TD: Last-Child" 2.16.html ("last ");
Finally, I want to be professional! :
$ ("Table tr TD: Nth-child (3)" pai.html (33)
$ ("Table tr TD: Nth-child (ODD)" pai.html (44)
$ ("Table tr TD: Nth-child (even)" pai.html (55)
$ ("Table tr TD: Nth-child (3N + 1)" pai.html (66)