Please tell me how to set background color dynamically by javasrcript ?

Since I am creating table in page but I want that its even number row must have color light grey & odd number row must have color light blue.

Please tell me how to do it ?

SInce I tried to make it by taking total number of row by javascript & in condition give color to their row but could not get any effect so please help me.

Please tell me how to set background color dynamically by javasrcript ?

Since I am creating table in page but I want that its even number row must have color light grey & odd number row must have color light blue.

Please tell me how to do it ?

SInce I tried to make it by taking total number of row by javascript & in condition give color to their row but could not get any effect so please help me.