message: test(weex): avoid key warnings
diff: @@ -69,12 +69,14 @@ export function _createElement (
  if (process.env.NODE_ENV !== 'production' &&
  isDef(data) && isDef(data.key) && !isPrimitive(data.key)
  ) {
  + 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) &&
  typeof children[0] === 'function'
  