I wanna to use google webfontloader to load web font async  

Here is my code:

```
<script>
        WebFontConfig = {
            custom: {
                families: [
                    'Noto Sans SC Sliced',
                    'Changa'
                ],
                urls: [
                    'https://fonts.googleapis.com/css?family=Changa',
                    'https://fonts.googleapis.com/earlyaccess/notosansscsliced.css'
                ]
            },
            timeout: 5000
        };
</script>
<script src='/lib/webfontloader.js'></script>
<style type="text/css">
    * {
        font-family: 'Noto Sans SC Sliced', sans-serif;
    }

#Logo {
    font-family: 'Changa', sans-serif;
}

```

The browser report no error and the font never change.What is wrong with my code?

Would you please help me?Thank you.

ps:I downloaded the webfontloader.js from here:<https://github.com/typekit/webfontloader> .The link is from google which showed in this page:<https://developers.google.com/fonts/docs/webfont_loader>