test(weex): avoid @binding key warnings

Author: yyx990803

Diff for: src/core/vdom/create-element.js

@@ -69,11 +69,13 @@ export function _createElement (
   if (process.env.NODE_ENV !== 'production' &&
     isDef(data) && isDef(data.key) && !isPrimitive(data.key)
   ) {
-    warn(
-      'Avoid using non-primitive value as key, ' +
-      'use string/number value instead.',
-      context
-    )
+    if (!__WEEX__ || !('@binding' in data.key)) {
+      warn(
+        'Avoid using non-primitive value as key, ' +
+        'use string/number value instead.',
+        context
+      )
+    }
   }
   // support single function children as default scoped slot
   if (Array.isArray(children) &&