fix signup page error in slow network environment

templates/user/auth/signup_inner.tmpl

@@ -163,11 +163,11 @@
 			return obj;
 		};		
 		var sharedUser = getUrlParams()['sharedUser'];
-		if (sharedUser) {
-			setTimeout(function() {
-				$('.invitation_tips').show().find('.__invitation_code__').text(sharedUser);
-				$('input#invitation_code').val(sharedUser).attr('readonly', true);
-			}, 20);
+		if (sharedUser) {			
+			document.querySelector('.invitation_tips').style.display = "block";
+			document.querySelector('.__invitation_code__').innerText = sharedUser;
+			document.querySelector('#invitation_code').value = sharedUser;
+			document.querySelector('#invitation_code').setAttribute("readonly", "true");
 		}
 	})();
 </script>