Three ways for js jquery to get server controls with randomly generated IDs_jquery

Since the server control will randomly generate the client ID after the ASP.NET web page is run, it is not easy to use jquery to obtain it. I googled it and found the following three methods:

Server control code:

1. $("#").val();

2. $("input[id*=txtUserID]").val();

3. $("*[id$=txtUserID]").val();