how to select n-th td of a tr using jquery

How can I select nth < td > of a < tr > using jquery. Say, I want to select 3rd <开发者_运维问答 td >. I have id for every tr. How can we achieve this ?

---

using :nth-child() Selector

like

$("tr td:nth-child(2)")

---

the eq api should do this for you

$("table td").eq(n)

---

$('#id td:nth-child(3)');

Like so for the 3rd.