gruntjs - compass 0.12.7 中的 "Cannot determine the opposite position of: to"错误

Question

运行 Compass 0.12.7 (Alnilam) 我多次遇到此错误:

Running "compass:dev" (compass) task
Cannot determine the opposite position of: to
Cannot determine the opposite position of: to
Cannot determine the opposite position of: to
Cannot determine the opposite position of: to
Cannot determine the opposite position of: to
Cannot determine the opposite position of: to
Cannot determine the opposite position of: to
Cannot determine the opposite position of: to
Cannot determine the opposite position of: to
Cannot determine the opposite position of: to
Cannot determine the opposite position of: to
Cannot determine the opposite position of: to
Cannot determine the opposite position of: to
Cannot determine the opposite position of: to
Cannot determine the opposite position of: to
Cannot determine the opposite position of: to
Cannot determine the opposite position of: to
Cannot determine the opposite position of: to
Cannot determine the opposite position of: to
Cannot determine the opposite position of: to
Cannot determine the opposite position of: to
Cannot determine the opposite position of: to
unchanged public/styles/sass/ie_only.scss
unchanged public/img/icons-s6ab39d30ab.png
overwrite public/styles/css/screen.css (2.484s)

我接受的梯度有问题，但是这里出了什么问题，我该如何缓解这个问题？

Answer 1

我在使用 compass 0.12.7 的项目中遇到了同样的问题，不幸的是，这个问题只能通过更新 compass 来解决。问题警告是在使用 linear-gradient 时引起的mixin 的位置值为 to right如下例所示:

div {
  @include background(linear-gradient(to right, red, blue));
}

这将被编译为这样的东西(在你的问题中抛出错误):

div {
  background: -webkit-gradient(linear, to right, to left, color-stop(0%, #ff0000), color-stop(100%, #0000ff));
  background: -webkit-linear-gradient(to right, #ff0000, #0000ff);
  background: -moz-linear-gradient(to right, #ff0000, #0000ff);
  background: -o-linear-gradient(to right, #ff0000, #0000ff);
  background: linear-gradient(to right, #ff0000, #0000ff);
}

不幸的是，这是无效的 CSS 代码。正确的输出应该如下:

div {
  background: -webkit-gradient(linear, 0% 50%, 100% 50%, color-stop(0%, #ff0000), color-stop(100%, #0000ff));
  background: -moz-linear-gradient(left, #ff0000, #0000ff);
  background: -webkit-linear-gradient(left, #ff0000, #0000ff);
  background: linear-gradient(to right, #ff0000, #0000ff);
}

正如我之前所说，解决它的唯一方法是更新 compass 。