[Feature][S300][task-view-617][webui] add web login username rules

Change-Id: Id2a127dbf35ec4bcead25df0de6e800488e748a0
diff --git a/lynq/S300/ap/app/zte_webui/js/com.js b/lynq/S300/ap/app/zte_webui/js/com.js
index ef1316d..c94fa29 100755
--- a/lynq/S300/ap/app/zte_webui/js/com.js
+++ b/lynq/S300/ap/app/zte_webui/js/com.js
@@ -8224,6 +8224,7 @@
                         logout.init();

                     } else {

                         target.password("");

+                        target.username("");

                         if(config.LOGIN_SECURITY_SUPPORT){

                             target.checkLoginData(function(){

                                 if (target.loginCount() == config.MAX_LOGIN_COUNT) {

@@ -8308,9 +8309,12 @@
             function setFocus(){

                 setTimeout(function () {

                     var txtAdmin = $('#txtAdmin:visible');

+                    var txtUser = $('#txtUser:visible');

                     var txtPIN = $('#txtPIN:visible');

                     var txtPUK = $('#txtPUK:visible');

-                    if (txtAdmin.length > 0) {

+                    if(txtUser.length > 0) {

+                        txtUser.focus();

+                    } else if (txtAdmin.length > 0) {

                         txtAdmin.focus();

                     } else if (txtPIN.length > 0) {

                         txtPIN.focus();