著名的前端图标库glyphs，提供了大量美观的icon，很适合中小网站使用，而且是免费的。但是其使用方式有一点特别，这里说明下：
- 首先要注册账号，需要提供自己的网址（必须）
- 有了账号，就可以得到自己的一个kit，其实就是针对你网址的个性化js。将其下载到本地并放到head标签中
- 如果你想使用某个icon，一定要save到自己的kit，才能在你网站上生效
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glyphs is a famous front-end icon set. to use it is a little bit different from others
- firstly, you have to sign up, it's a must
- Secondly, you have obtained a kit belong to you, a customize-on-your-site js. download it and put it into your <head>
- Thirdly, when you wanna use an icon, do remember to save it to your kit, otherwise, it won't work on your site