buttonGroup的layouts可以不用传数组

src/base/combination/group.button.js

@@ -77,11 +77,12 @@ BI.ButtonGroup = BI.inherit(BI.Widget, {
 
     _packageBtns: function (btns) {
         var o = this.options;
-        for (var i = o.layouts.length - 1; i > 0; i--) {
+        var layouts = BI.isArray(o.layouts) ? o.layouts : [o.layouts];
+        for (var i = layouts.length - 1; i > 0; i--) {
             btns = BI.map(btns, function (k, it) {
-                return BI.extend({}, o.layouts[i], {
+                return BI.extend({}, layouts[i], {
                     items: [
-                        BI.extend({}, o.layouts[i].el, {
+                        BI.extend({}, layouts[i].el, {
                             el: it
                         })
                     ]
@@ -108,7 +109,7 @@ BI.ButtonGroup = BI.inherit(BI.Widget, {
     },
 
     _packageLayout: function (items) {
-        var o = this.options, layout = BI.deepClone(o.layouts[0]);
+        var o = this.options, layout = BI.deepClone(BI.isArray(o.layouts) ? o.layouts[0] : o.layouts);
 
         var lay = BI.formatEL(layout).el;
         while (lay && lay.items && !BI.isEmpty(lay.items)) {
@@ -121,7 +122,7 @@ BI.ButtonGroup = BI.inherit(BI.Widget, {
     // 如果是一个简单的layout
     _isSimpleLayout: function () {
         var o = this.options;
-        return o.layouts.length === 1 && !BI.isArray(o.items[0]);
+        return BI.isArray(o.layouts) ? (o.layouts.length === 1 && !BI.isArray(o.items[0])) : true;
     },
 
     doBehavior: function () {