无JIRA tab的showIndex 响应式也支持false的时候不进行创建

src/base/combination/tab.js

@@ -86,15 +86,18 @@ BI.Tab = BI.inherit(BI.Widget, {
 
     created: function () {
         var self = this, o = this.options;
-        if (o.showIndex !== false) {
+
+        var showIndex;
         if (BI.isFunction(o.showIndex)) {
-                var v = this.__watch(o.showIndex, function (context, newValue) {
+            showIndex = this.__watch(o.showIndex, function (context, newValue) {
                 self.setSelect(newValue);
             });
-                this.setSelect(v);
         } else {
-                this.setSelect(o.showIndex);
+            showIndex = o.showIndex;
         }
+
+        if (showIndex !== false) {
+            this.setSelect(showIndex);
         }
     },