整理代码

examples/dev.html

@@ -34,8 +34,8 @@
                                 text: 1
                             }, {
                                 type: "bi.label",
-                                key: "2",
+                                key: "123",
-                                text: 2
+                                text: "start"
                             }])
                         }
                     }, {

src/core/wrapper/layout.js

@@ -486,6 +486,7 @@ BI.Layout = BI.inherit(BI.Widget, {
         function addNode (vnode, index) {
             var opt = self._getOptions(vnode);
             var key = opt.key == null ? index : opt.key;
+            delete self._children[self._getChildName(index)];
             return children[key] = self._addElement(index, vnode);
         }