Pull request #3155: 无JIRA 添加BI.execWithContext

Merge in VISUAL/fineui from ~DAILER/fineui:master to master

* commit '9abfd6c339509069f7dcf2768c121d49d2d139f2':
  无JIRA 添加BI.execWithContext

src/core/4.widget.js

@@ -927,6 +927,16 @@
         return vm;
     };
 
+    BI.execWithContext = function (_context, fn) {
+        BI.Widget.pushContext(_context);
+        try {
+            fn();
+        } catch (e) {
+            // nothing
+        }
+        BI.Widget.popContext();
+    };
+
     BI.watch = function (vm, watch, handler) {
         // 必须要保证组件当前环境存在
         if (BI.Widget.current) {