The keyboard enter button triggers the login event

$("#nameInput").focus(); 
$(".txtUserName").keydown(function (event) { 
    if (event.keyCode == 13) { 
        login(); 
    } 
}) 



$("#nameInput" ).focus(); This sentence is added because some websites remember the user name and password by default, so it cannot be triggered, so to manually let the user name get the focus 

$(".txtUserName") This class name generally needs to be added on username and password, and all fields of the same type