Jquery line background color alternate display (line color) implementation code

Some CSS definitions can be selected as needed.
// Display different background colors for single and double rows [method 1 ]:
// $ ("# Ul_id Li: Even"). ATTR ("classname", "redclass ");
// Display different background colors for single and double rows [method 2 ]:
$ ("# Ul_id Li: Even"). addclass ("redclass ");
<Ul id = "ul_id">
<Li> singular </LI>
<Li> dual number </LI>
<Li> dual number </LI>
</Ul>
Odd: single
Even: double
Jquery table row-changing code

Li line color swap

The row-based color change of the JS control table