<g-button>默认按钮</g-button>
<g-button icon="settings">设置</g-button>
<g-button icon="download">点赞</g-button>
<g-button icon="thumbs-up">下载</g-button>
<g-button :loading="true">登陆中</g-button>
<g-button disabled>默认按钮</g-button>