Denial of access in ie9

@gfdev Denial of access in ie9
```js
{description: "拒绝访问。  ", message: "拒绝访问。  ", name: "Error", number: -2147024891}
```

This is my code:

```js
$.support.cors = true
$.ajax({
  type: 'GET',
  url: baseUrl + CONSTS.api.publicKey,
  xhrFields: {
     withCredentials: true
  },
  crossDomain: true,
  ...
})
```