A little bug about the zh branch

{}.hasOwnProperty.call(foo, 'bar');
//It does not work on chrome, I change it to this:
({}).hasOwnProperty.call(foo, 'bar');
![JavaScript ](https://f.cloud.github.com/assets/2226207/355704/d9d6dd70-a0ea-11e2-8aa0-20e55b89381b.png)