css - IE 特定过滤器(如 -ms-filter)的 Sass Mixin 错误

Question

我正在尝试制作这样的按钮混合:

=default_button(!lighter, !darker) 
  :border= 1px !lighter solid
  :background-color #e3e3e3
  :background= -webkit-gradient(linear, 0 0, 0 100%, from(!lighter), to(!darker)) repeat-x, #d0581e
  :background= -moz-linear-gradient(90deg, !darker, !lighter) repeat-x scroll 0 0 #d0581e
  :filter= progid:DXImageTransform.Microsoft.gradient(startColorstr='!lighter', endColorstr='!darker')
  :-ms-filter= "progid:DXImageTransform.Microsoft.gradient(startColorstr='!lighter', endColorstr='!darker')"
  :zoom 1
  :margin 0 0 0 0
  :width auto
  :padding 2px 14px 2px 14px
  :border-radius 10px
  :-webkit-border-radius 10px
  :-moz-border-radius 10px
  :color #FFF

当我编译 sass 时，对于以 -filter 和 -ms-filter 开头的行，我得到了这个错误:

SASS::SyntaxError: Expected rparen token, was single_eq token

我很确定这是我对 = 的放置，但我不确定如何正确编写它。如果我传递十六进制值而不是 !lighter、!darker，它会起作用，因为这样我就可以像这样删除 = 符号:

:filter progid:DXImageTransform.Microsoft.gradient(startColorstr='#F89F16', endColorstr='#d0581e')
:-ms-filter "progid:DXImageTransform.Microsoft.gradient(startColorstr='#F89F16', endColorstr='#d0581e')"

Answer 1

这样解决了，但仍在寻找最佳方法的替代建议...

=default_button(!lighter, !darker) 
  text-shadow= 1px 1px 3px darken(!darker, 8)
  border= 1px !darker solid
  background-color= !lighter
  background= -webkit-gradient(linear, 0 0, 0 100%, from(!lighter), to(!darker)) repeat-x, !darker
  background= -moz-linear-gradient(90deg, !darker, !lighter) repeat-x scroll 0 0 !darker
  -ms-filter = "progid:DXImageTransform.Microsoft.gradient(startColorstr='#{!lighter}', endColorstr='#{!darker}')"
  :zoom 1
  :margin 0 0 0 0
  :width auto

自从最初发布此答案以来，Sass 的语法发生了变化。现代 sass(缩进)语法如下所示:

=default_button($lighter, $darker) 
  text-shadow: 1px 1px 3px darken($darker, 8)
  border: 1px $darker solid
  background-color: $lighter
  background: -webkit-gradient(linear, 0 0, 0 100%, from($lighter), to($darker)) repeat-x, $darker
  background: -moz-linear-gradient(90deg, $darker, $lighter) repeat-x scroll 0 0 $darker
  -ms-filter: unquote("progid:DXImageTransform.Microsoft.gradient(startColorstr='#{$lighter}', endColorstr='#{$darker}')")
  zoom: 1
  margin: 0 0 0 0
  width: auto