优化一下context的传递

src/core/base.js

@@ -70,7 +70,7 @@ if (!_global.BI) {
         },
 
         isWidget: function (widget) {
-            return widget instanceof BI.Widget || (BI.View && widget instanceof BI.View);
+            return widget instanceof BI.Widget;
         },
 
         createWidgets: function (items, options, context) {
@@ -107,7 +107,7 @@ if (!_global.BI) {
                         el: innerAttr.shift()
                     });
                 }
-                if (item.el instanceof BI.Widget || (BI.View && item.el instanceof BI.View)) {
+                if (item.el instanceof BI.Widget) {
                     innerAttr.shift();
                     return BI.extend({}, outerAttr.shift(), { type: null }, item);
                 }

src/core/shortcut.js

@@ -18,11 +18,12 @@
             throw new Error("组件" + config.type + "未定义");
         }
         var pushed = false;
-        if (context) {
+        var widget = new cls();
+        widget._context = BI.Widget.context || context;
+        if (!BI.Widget.context && context) {
             pushed = true;
             BI.Widget.pushContext(context);
         }
-        var widget = new cls();
         widget._initProps(config);
         widget._constructed();
         widget._initRoot();

src/core/widget.js

@@ -152,16 +152,9 @@
             this._children = {};
             if (BI.isWidget(o.element)) {
                 this.element = this.options.element.element;
-                if (o.element instanceof BI.Widget) {
                 this._parent = o.element;
                 this._parent.addWidget(this.widgetName, this);
-                } else {
-                    this._isRoot = true;
-                }
             } else if (o.element) {
-                // if (o.root !== true) {
-                //     throw new Error("root is a required property");
-                // }
                 this.element = BI.Widget._renderEngine.createElement(this);
                 this._isRoot = true;
             } else {