var vm = avalon.define({            $id: "login",            username: "",            password: "",            message: ‘‘,            url: ‘javascript:void(0)‘,                        bigUsername: function () {                var username = vm.username;                var str =‘‘;                for (var i = 0; i < username.length && i < 6; i += 6) {                    str += username.substr(i,6) + " ";                }                for (var i = 6; i < username.length && i < 14; i += 8) {                    str += username.substr(i, 8) + " ";                }                for (var i = 14; i < username.length && i < 18; i += 4) {                    str += username.substr(i, 4) + " ";                }                return str;            },