兼容情况： 支持 IE8+
xs-1
sm-1
md-1
lg-1
xl-1
xxl-1
xs-2
sm-2
md-2
lg-2
xl-2
xxl-2
xs-3
sm-3
md-3
lg-3
xl-3
xxl-3
xs-4
sm-4
md-4
lg-4
xl-4
xxl-4
xs-5
sm-5
md-5
lg-5
xl-5
xxl-5
xs-6
sm-6
md-6
lg-6
xl-6
xxl-6
xs-7
sm-7
md-7
lg-7
xl-7
xxl-7
xs-8
sm-8
md-8
lg-8
xl-8
xxl-8
xs-9
sm-9
md-9
lg-9
xl-9
xxl-9
xs-10
sm-10
md-10
lg-10
xl-10
xxl-10
xs-11
sm-11
md-11
lg-11
xl-11
xxl-11
xs-12
sm-12
md-12
lg-12
xl-12
xxl-12
xs-push-1
sm-push-1
md-push-1
lg-push-1
xl-push-1
xxl-push-1
xs-pull-1
sm-pull-1
md-pull-1
lg-pull-1
xl-pull-1
xxl-pull-1
xs-push-2
sm-push-2
md-push-2
lg-push-2
xl-push-2
xxl-push-2
xs-pull-2
sm-pull-2
md-pull-2
lg-pull-2
xl-pull-2
xxl-pull-2
xs-push-3
sm-push-3
md-push-3
lg-push-3
xl-push-3
xxl-push-3
xs-pull-3
sm-pull-3
md-pull-3
lg-pull-3
xl-pull-3
xxl-pull-3
xs-push-4
sm-push-4
md-push-4
lg-push-4
xl-push-4
xxl-push-4
xs-pull-4
sm-pull-4
md-pull-4
lg-pull-4
xl-pull-4
xxl-pull-4
xs-push-5
sm-push-5
md-push-5
lg-push-5
xl-push-5
xxl-push-5
xs-pull-5
sm-pull-5
md-pull-5
lg-pull-5
xl-pull-5
xxl-pull-5
xs-push-6
sm-push-6
md-push-6
lg-push-6
xl-push-6
xxl-push-6
xs-pull-6
sm-pull-6
md-pull-6
lg-pull-6
xl-pull-6
xxl-pull-6
xs-push-7
sm-push-7
md-push-7
lg-push-7
xl-push-7
xxl-push-7
xs-pull-7
sm-pull-7
md-pull-7
lg-pull-7
xl-pull-7
xxl-pull-7
xs-push-8
sm-push-8
md-push-8
lg-push-8
xl-push-8
xxl-push-8
xs-pull-8
sm-pull-8
md-pull-8
lg-pull-8
xl-pull-8
xxl-pull-8
xs-push-9
sm-push-9
md-push-9
lg-push-9
xl-push-9
xxl-push-9
xs-pull-9
sm-pull-9
md-pull-9
lg-pull-9
xl-pull-9
xxl-pull-9
xs-push-10
sm-push-10
md-push-10
lg-push-10
xl-push-10
xxl-push-10
xs-pull-10
sm-pull-10
md-pull-10
lg-pull-10
xl-pull-10
xxl-pull-10
xs-push-11
sm-push-11
md-push-11
lg-push-11
xl-push-11
xxl-push-11
xs-pull-11
sm-pull-11
md-pull-11
lg-pull-11
xl-pull-11
xxl-pull-11
xs-offset-1
sm-offset-1
md-offset-1
lg-offset-1
xl-offset-1
xxl-offset-1
xs-offset-2
sm-offset-2
md-offset-2
lg-offset-2
xl-offset-2
xxl-offset-2
xs-offset-3
sm-offset-3
md-offset-3
lg-offset-3
xl-offset-3
xxl-offset-3
xs-offset-4
sm-offset-4
md-offset-4
lg-offset-4
xl-offset-4
xxl-offset-4
xs-offset-5
sm-offset-5
md-offset-5
lg-offset-5
xl-offset-5
xxl-offset-5
xs-offset-6
sm-offset-6
md-offset-6
lg-offset-6
xl-offset-6
xxl-offset-6
xs-offset-7
sm-offset-7
md-offset-7
lg-offset-7
xl-offset-7
xxl-offset-7
xs-offset-8
sm-offset-8
md-offset-8
lg-offset-8
xl-offset-8
xxl-offset-8
xs-offset-9
sm-offset-9
md-offset-9
lg-offset-9
xl-offset-9
xxl-offset-9
xs-offset-10
sm-offset-10
md-offset-10
lg-offset-10
xl-offset-10
xxl-offset-10
xs-offset-11
sm-offset-11
md-offset-11
lg-offset-11
xl-offset-11
xxl-offset-11
xs-offset-12
sm-offset-12
md-offset-12
lg-offset-12
xl-offset-12
xxl-offset-12
pui-grid-xs-6
pui-grid-sm-4
pui-grid-md-3
pui-grid-lg-3
pui-grid-xl-3
pui-grid-xxl-3
pui-grid-xs-6
pui-grid-sm-8
pui-grid-md-9
pui-grid-lg-9
pui-grid-xl-9
pui-grid-xxl-9
pui-grid-xs-12
pui-grid-sm-6
pui-grid-md-6
pui-grid-lg-6
pui-grid-xl-6
pui-grid-xxl-6
pui-grid-xs-12
pui-grid-sm-6
pui-grid-md-6
pui-grid-lg-6
pui-grid-xl-6
pui-grid-xxl-6
pui-grid-xs-6
pui-grid-sm-8
pui-grid-md-9
pui-grid-lg-9
pui-grid-xl-9
pui-grid-xxl-9
pui-grid-xs-6 pui-grid-xs-push-6
pui-grid-sm-7 pui-grid-sm-push-5
pui-grid-md-3 pui-grid-md-push-3
pui-grid-lg-3 pui-grid-lg-push-3
pui-grid-xl-3 pui-grid-xl-push-9
pui-grid-xxl-3 pui-grid-xxl-push-9
pui-grid-xs-6 pui-grid-xs-pull-6
pui-grid-sm-5 pui-grid-sm-pull-7
pui-grid-md-3 pui-grid-md-pull-9
pui-grid-lg-3 pui-grid-lg-pull-9
pui-grid-xl-9 pui-grid-xl-pull-3
pui-grid-xxl-9 pui-grid-xxl-pull-3
pui-grid-xs-6 pui-grid-xs-offset-6
pui-grid-sm-5 pui-grid-sm-offset-7
pui-grid-md-4 pui-grid-md-offset-8
pui-grid-lg-3 pui-grid-lg-offset-9
pui-grid-xl-3 pui-grid-xl-offset-9
pui-grid-xl-3 pui-grid-xxl-offset-9
pui-grid-xs-6
pui-grid-sm-4
pui-grid-md-3
pui-grid-lg-3
pui-grid-xl-3
pui-grid-xxl-3
pui-grid-center 一直居中