<button>普通按钮</button>
<button type="primary">主色调按钮</button>
<button type="warn">警告按钮</button>
<button size="mini">普通按钮</button>
<button type="primary" size="mini">主色调按钮</button>
<button type="warn" size="mini">警告按钮</button>
<button size="mini" plain>普通按钮</button>
<button type="primary" size="mini" plain>主色调按钮</button>
<button type="warn" size="mini" plain>警告按钮</button>
属性type:种类
属性size:大小
属性plain:镂空
