基础用法
默认
独占一行: block
block
各种主题: type
type = primary
type = error
type = warning
type = link
type = success
无填充按钮：plain
type = primary
type = error
type = warning
type = link
type = success
按钮大小：size
max
normal
min
圆角按钮：round
round
round
round
3
圆行按钮：circle
1
2
3
带图标按钮：icon
icon="vui-icon-delete"
delete
disabled
disabled
click事件
click handle
一个参数
两个参数