按钮属性 cu-btn 加圆：round 大小：sm lg 背景颜色：bg-red 镂空：line-red 块状: ``` <button class="cu-btn bg-red margin-tb-sm lg">块状</button> ``` 按钮加图标: ``` <button class="cu-btn block margin-tb-sm line-orange lg"><text class="cuIcon-upload"></text>图标</button> ```