"2017-06-29" Automatically returns the last Request page, JS gets the number of rows and columns in table in the login page

First, on the login page automatically return to the last request page

Request.urlreferrer
Like what

if (request.urlreferrer! = null) {
If you can get an address
Response.Redirect (Request.UrlReferrer.ToString ());
} else {
No route address
Response.Redirect ("index.aspx");

Second, JS gets the number of rows and columns in the table
var table =document.getelementbyid ("Tab1");
var rows = table.rows.length;
Alert (' Number of rows ' +rows);
var colums = table.rows[0].cells.length;
Alert (' Number of columns ' +colums);

Get row index
Tr1.rowindex TR1 is a row object

"2017-06-29" Automatically returns the last Request page, JS gets the number of rows and columns in table in the login page